WO2023079210A1 - A rotor blade and a wind turbine - Google Patents

A rotor blade and a wind turbine Download PDF

Info

Publication number
WO2023079210A1
WO2023079210A1 PCT/FI2022/050712 FI2022050712W WO2023079210A1 WO 2023079210 A1 WO2023079210 A1 WO 2023079210A1 FI 2022050712 W FI2022050712 W FI 2022050712W WO 2023079210 A1 WO2023079210 A1 WO 2023079210A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor blade
winglet
axis
rotation
distance
Prior art date
Application number
PCT/FI2022/050712
Other languages
French (fr)
Inventor
Hannu Rissanen
Original Assignee
Single Wing Energy Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Single Wing Energy Oy filed Critical Single Wing Energy Oy
Publication of WO2023079210A1 publication Critical patent/WO2023079210A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/062—Rotors characterised by their construction elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/061—Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/062—Rotors characterised by their construction elements
    • F03D3/064—Fixing wind engaging parts to rest of rotor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a rotor blade and more particularly to a rotor blade according to the preamble of claim 1.
  • the present invention further relates to a wind turbine and more particularly to a wind turbine according to the preamble of claim 12.
  • wind turbines have rotor blades.
  • a wind rotates rotor blades and rotation of the rotor blades is converted to electric power.
  • the rotor blades are arranged to rotate around a rotation axis which is typically positioned vertically or horizontally.
  • Vertical axis wind turbines are typically used for installations where wind conditions are not consistent, or due to public ordinances the turbine cannot be placed high enough to benefit from steady wind.
  • Vertical axis wind turbines may have major components close to the ground. The presence of the energy sensor near the ground exposes it to turbulence and wind gradient, which reduces its effectiveness.
  • air flowing from any direction or speed can rotate the blades.
  • the vertical axis wind turbines may be equipped with low-speed blades.
  • the unit has two or three blades and can be shorter and closer to the ground than a horizontal system. Not all of the rotor blades of a vertical axis wind turbine produce torque at the same time, which limits the efficiency of vertical systems in producing energy. Other blades are simply pushed along. There is also more drag on the blades when they rotate. The aerodynamic drag created by an airfoil of the rotor blades decreases efficiency of wind turbine.
  • a low starting torque can limit functionality of vertical axis wind turbines.
  • An object of the present invention is to provide a rotor blade and a wind turbine so as to overcome or at least alleviate the prior art disadvantages.
  • the objects of the invention are achieved by a rotor blade which is characterized by what is stated in the independent claim 1.
  • the objects of the invention are achieved by a wind turbine which is characterized by what is stated in the independent claim 12.
  • the invention is based on the idea of providing a rotor blade for a wind turbine.
  • the rotor blade is arranged to be rotated around an axis of rotation.
  • the rotor blade having a first end and a second end, the rotor blade having a leading edge extending between the first end and the second end of the rotor blade, and the leading edge is arranged to lead the rotor blade in a movement around the axis of rotation of the rotor blade.
  • the rotor blade comprises a first winglet provided to the rotor blade in the first end of the rotor blade or in the vicinity of the first end of the rotor blade, the first winglet is arranged to protrude from the rotor blade and the first winglet is arranged to extend in a direction transverse to a direction between the first end and the second end of the rotor blade.
  • a wind turbine means a wind-powered electrical generator.
  • a wind turbine is a device that converts the wind's kinetic energy into electrical energy.
  • the rotor blade further comprises a second winglet provided to the rotor blade in the second end of the rotor blade or in the vicinity of the second end of the rotor blade, the second winglet is arranged to protrude from the rotor blade and the second winglet is arranged to extend transverse to a direction between the first end and the second end of the rotor blade.
  • the rotor blade further comprises a second winglet provided to the rotor blade in the second end of the rotor blade or in the vicinity of the second end of the rotor blade, the second winglet is arranged to protrude from the leading edge in a direction away from the rotor blade and the second winglet is arranged to extend transverse to a direction between the first end and the second end of the rotor blade.
  • the second winglet further decreases the aerodynamic drag created by an airfoil.
  • the rotor blade having a cross-section, the crosssection of the rotor blade being transverse to a direction between the first end and the second end of the rotor blade, and the cross-section of the rotor blade being uniform between the first end of the rotor blade and the second end of the rotor blade.
  • This kind of rotor blade is simple to manufacture, and the rotor blade has a large area against a wind.
  • the rotor blade having a first thickness at the first end of rotor blade, a second thickness at the second end of rotor blade and a third thickness between the first end and the second end of the rotor blade and the third thickness being greater than the first thickness and greater than the second thickness.
  • the greater third thickness increases stiffness of the rotor blade.
  • the rotor blade having an inner surface and an outer surface, the inner surface and the outer surface extending between the first end and the second end of the rotor blade and the rotor blade comprises a blade wall between the inner surface and the outer surface, and the blade wall comprises a stiffener.
  • the rotor blade having a first surface, the first surface facing away from the axis of rotation, and the first winglet is arranged to protrude from the first surface in a direction away from the axis of rotation.
  • the rotor blade having a first surface, the first surface facing away from the axis of rotation, and the first winglet and the second winglet are arranged to protrude in a direction from the axis of rotation.
  • the rotor blade having a leading surface facing towards a direction of the movement, and the first winglet is arranged to protrude from the leading surface.
  • the rotor blade having a leading surface facing towards a direction of the movement, and the first winglet and the second winglet are arranged to protrude from the leading surface.
  • the rotor blade having an outer surface, the outer surface facing away from the rotor blade, and the first winglet is arranged to protrude from the outer surface of the rotor blade in a direction away from the rotor blade.
  • the rotor blade having an outer surface, the outer surface facing away from the rotor blade, the first winglet and the second winglet are arranged to protrude from the outer surface of the rotor blade in a direction away from the rotor blade.
  • the rotor blade having a first surface and a second surface, the second surface facing towards the axis of rotation, the first surface facing away from the axis of rotation, and the first winglet is arranged to protrude in a direction away from the first surface of the rotor blade and in a direction away from the second surface of the rotor blade.
  • the rotor blade having a first surface and a second surface, the second surface facing towards the axis of rotation, the first surface facing away from the axis of rotation, and the first winglet and the second winglet are arranged to protrude in a direction away from the first surface of the rotor blade and in a direction away from the second surface of the rotor blade.
  • the first winglet is arranged to protrude from the leading edge in a direction away from the rotor blade and the first winglet is arranged to extend in a direction transverse to a direction between the first end and the second end of the rotor blade.
  • the rotor blade having a trailing edge opposite to the leading edge, the first winglet is arranged to protrude from the leading edge in a direction away from the trailing edge, and the first winglet is arranged to extend in a direction transverse to a direction between the first end and the second end of the rotor blade.
  • the rotor blade having a trailing edge opposite to the leading edge, and the first winglet is arranged to taper towards the trailing edge.
  • the rotor blade having a trailing edge opposite to the leading edge, and the first winglet and the second winglet are arranged to taper towards the trailing edge.
  • the first winglet is arranged to protrude at a first distance from the rotor blade.
  • the first winglet is arranged to protrude from an outer surface of the rotor blade circumferentially at a first distance from the outer surface.
  • the first winglet is arranged to protrude circumferentially from an outer surface of the rotor blade at a first distance from the outer surface of the rotor blade, and the first distance being uniform. In a yet alternative embodiment, the first winglet is arranged to protrude at a first distance from the rotor blade and the second winglet is arranged to protrude at a seventh distance from the rotor blade, the first distance being uniform and the seventh distance being uniform.
  • the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a distance from the outer surface.
  • the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a first distance from the outer surface, and the first distance being uniform.
  • the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a distance from the outer surface, and the second winglet being identical to the first winglet.
  • the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a first distance from the outer surface, and the second winglet being identical to the first winglet.
  • the axis of rotation is arranged to be in an upright position to extend parallel to a direction between a first end and the second end of the rotor blade.
  • the axis of rotation is arranged to extend in a direction parallel to a direction between a first end and the second end of the rotor blade and the support arm is provided between the second surface of the rotor blade and the axis of rotation.
  • the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade.
  • the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, and the support arm is arranged to protrude from the second surface of the rotor blade in direction away from the rotor blade.
  • the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, the support arm is arranged to protrude in direction away from the rotor blade and the support arm is arranged to transfer rotational power of the rotor blade.
  • the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, the support arm is arranged to protrude from the second surface of the rotor blade in direction away from the rotor blade, the support arm comprises one or more support bars and the support arm is arranged to transfer rotational power of the rotor blade.
  • the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, the support arm is arranged to protrude in direction away from the rotor blade, the support arm comprises two or more support bars, the two or more support bars and the support arm is arranged to transfer rotational power of the rotor blade.
  • the support arm is arranged to transfer rotational power from the rotor blade to a wind power generator or to transmission components of the wind power generator or to a rotatable wind power tower.
  • the rotor blade comprises a second surface facing towards the axis of rotation, and the second surface of the rotor blade comprises a flat portion.
  • the rotor blade comprises a second surface facing towards the axis of rotation, and the second surface of the rotor blade comprises a convex portion.
  • the rotor blade comprises a second surface facing towards the axis of rotation, the second surface of the rotor blade comprises a convex portion, the rotor blade comprises a first surface facing away from the axis of rotation, the rotor blade having a chord line, the chord line extends from the leading edge to the trailing edge, the chord line being a straight line, the rotor blade having a mean camber line, the mean camber line being equidistant from the first surface and the second surface of the rotor blade, and the mean camber line is provided between the chord line and the first surface.
  • the rotor blade comprises a second surface, the second surface is facing towards the axis of rotation, the second surface of the rotor blade comprises a convex portion, the rotor blade comprises a first surface facing towards the axis of rotation, and the second surface being identical to the first surface.
  • the rotor blade comprises a second surface, the second surface is facing towards the axis of rotation, the second surface of the rotor blade comprises a concave portion.
  • the rotor blade comprises a first surface and a second surface, and the first surface and the second surface comprise a form of a helix between the first end and second end of the rotor blade.
  • the rotor blade comprises a first surface and a second surface
  • the first surface and the second surface comprise a form of a helical twist between the first end and second end of the rotor blade.
  • helix means a curve that goes around a central tube in the form of a spiral.
  • the rotor blade having a shape of spiral.
  • the rotor blade comprises a first surface, and the first surface of the rotor blade comprises a convex portion.
  • the convex portion of the first surface increases aerodynamic efficiency of the rotor blade.
  • the rotor blade comprises a second surface, and the second surface of the rotor blade comprises a flat portion.
  • the convex portion of the second surface further increases aerodynamic efficiency of the rotor blade.
  • the first winglet is fixedly connected to or integrated to the rotor blade.
  • first winglet and the second winglet are fixedly connected to or integrated to the rotor blade.
  • the support arm is fixedly connected to or integrated to the rotor blade between the first end and the second end of the rotor blade.
  • the first winglet is fixedly connected to or integrated to the rotor blade and the support arm is fixedly connected to or integrated to the rotor blade between the first end and the second end of the rotor blade.
  • first winglet and the second winglet are fixedly connected to or integrated to the rotor blade and the support arm is fixedly connected to or integrated to the rotor blade between the first end and the second end of the rotor blade.
  • the present invention provides a wind turbine.
  • the wind turbine comprises a rotor blade.
  • the rotor blade comprises a first winglet provided to the rotor blade in the vicinity of the first end of the rotor blade or in the first end of the rotor blade, and the rotor blade is arranged to be rotated around an axis of rotation.
  • the axis of rotation R being in an upright position.
  • the rotor blade having a longitudinal direction between the first end and the second end of the rotor blade, and the longitudinal direction of the rotor blade is positioned in an upright position.
  • the rotor blade having a longitudinal direction between the first end and the second end of the rotor blade, and the longitudinal direction of the rotor blade is positioned in an upright position, the rotor blade having a first surface and a second surface, the second surface facing towards the axis of rotation, the first surface facing away from the axis of rotation, the second surface of the rotor blade is positioned at a sixth distance from the axis of rotation, and longitudinal direction of the rotor blade being parallel to the axis of rotation.
  • the longitudinal direction of the rotor blade is positioned in an upright position provides a rotor blade such that a weight of the rotor blade does not cause a bending moment to the rotor blade
  • the rotor blade is positioned in a tilted position.
  • the rotor blade is positioned in a tilted position, the first end of the rotor blade is arranged above the second end of the blade, the first end is arranged at a second distance from the axis of rotation and the second end is arranged at a third distance from the axis of rotation, and the second distance being greater than the third distance; or
  • the rotor blade is positioned in a tilted position, the first end of the rotor blade is arranged above the second end of the blade, the first end is arranged at a second distance from the axis of rotation and the second is arranged at a third distance from the axis of rotation, and the third distance being greater than the second distance.
  • the rotor blade is arranged to be rotated around an axis of rotation, and the axis of rotation being in an upright position.
  • the wind turbine comprises one rotor blade, and all wind energy of the wind turbine is provided with the one rotor blade.
  • the wind turbine is arranged to convert kinetic energy of a wind into electric energy.
  • all wind energy of the wind turbine means all kinetic energy of the wind which the wind turbine converts into electric energy with the wind turbine.
  • the wind turbine comprises one rotor blade, and all kinetic energy of the wind turbine is provided with the one rotor blade.
  • the wind turbine comprises only one rotor blade. This reduces number of rotor blades and thus, the structure of the wind turbine is simple.
  • the wind turbine comprises two rotor blades, the two rotor blades comprises a first rotor blade and a second rotor blade, the axis of rotation is arranged between the first rotor blade and the second rotor blade, the leading edge of first rotor blade facing in an opposite direction than the leading edge of second rotor blade and all wind energy of the wind turbine is provided with the first rotor blade and with the second rotor blade.
  • the wind turbine comprises three or more rotor blades.
  • the rotor blade of the wind turbine being a rotor blade according to any above disclosed embodiment of the rotor blade.
  • An advantage of the invention is that it enables improving an efficiency of wind turbine.
  • the invention improving especially an efficiency of a vertical axis wind turbine.
  • the invention enables reducing a drag of rotor blade.
  • the rotor blade according to present invention is simple to manufacture.
  • Figure la shows schematically a top view of a rotor blade according to one embodiment the present invention
  • Figure lb shows schematically an end view of a rotor blade of figure la
  • Figure 2a shows schematically a top view of a first winglet and a second winglet of a rotor blade according to one embodiment the present invention
  • Figure 2b shows schematically a side view of the first winglet and the second winglet of a rotor blade of figure 2a;
  • Figures 3a, 3b, 3c and 3d show schematically a top view of different embodiments of a first winglet and a second winglet of a rotor blade according to the present invention
  • Figures 4a, 4b and 4c show schematically a top view of different embodiments of a rotor blade according to the present invention
  • Figures 5a, 5b, 5c and 5d show schematically an end view of a rotor blade according to different embodiments of the present invention
  • Figure 6a shows schematically a top view of a wind turbine according to one embodiment the present invention
  • Figure 6b shows schematically an end view of a wind turbine of figure 6a
  • Figure 7 shows schematically a top view of a wind turbine according to one embodiment the present invention.
  • Figures 8a and 8b show schematically an end view of a wind turbine according to different embodiments of the present invention.
  • Figure la and lb show a rotor blade according to one embodiment of the present invention 1.
  • the rotor blade 10 is arranged to be rotated around an axis of rotation R.
  • the rotor blade 10 having a first end 15 and a second end 16.
  • the rotor blade 10 having a leading edge 11 extending between the first end 15 and the second end 16 of the rotor blade 10.
  • the leading edge 13 is arranged to lead the rotor blade 10 in a movement M around the axis of rotation R of the rotor blade 10.
  • the movement M being rotational movement and the leading edge 11 is arranged to lead the rotor blade 10 in the rotational movement.
  • the rotor blade comprises a first winglet 13 provided to the rotor blade 10 in the first end 15 of the rotor blade 10 or in the vicinity of the first end 15 of the rotor blade 10, the first winglet 13 is arranged to protrude from the leading edge 11 in a direction away from the rotor blade 10 and the first winglet 13 is arranged to extend in a direction transverse to a direction between the first end 15 and the second end 16 of the rotor blade 10.
  • the first winglet 13 is arranged to extend in a direction transverse relative to a direction between the first end 15 and the second end 16 of the rotor blade 10.
  • the first winglet 13 being a plate.
  • the second winglet 14 being a plate.
  • the first winglet 13 being a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 30° and 150°.
  • the first winglet 13 is a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 45° and 135°.
  • the first winglet 13 is a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 85° and 95°.
  • the first winglet 13 is a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is 90°.
  • the second winglet 14 being a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 30° and 150°.
  • the second winglet 14 is a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 45° and 135°.
  • the second winglet 14 is a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 85° and 95°.
  • the second winglet 14 is a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is 90°.
  • leading edge 11 of the rotor blade 10 is the foremost edge and the leading edge 11 is therefore the part which first meets the oncoming air.
  • the rotor blade 10 having a longitudinal direction L between the first end 15 and the second end 16 of the rotor blade 10.
  • the longitudinal direction L of the rotor blade 10 is arranged to be positioned in an upright position.
  • the axis of rotation R is arranged to be in an upright position.
  • the upright position means a direction having an angle between the horizontal direction such that the angle being between 80° and 100°.
  • the rotor blade 10 is arranged to be rotated around the axis of rotation R at a sixth distance D from the axis of rotation R.
  • the rotor blade 10 may be made with fibreglass-reinforced polyester, epoxy, carbon fibre, aramid (Kevlar), wood-epoxy or wood-fibre-epoxy.
  • the rotor blade 10 may be manufactured with an extrusion machine by pushing material through a die of the desired cross-section or with a drawing machine using the tensile strength of the material to pull it through the die or with a 3D-printing machine or with a mould.
  • a distance between the first end 15 and the second end 16 of the rotor blade 10 being between 4 m and 6 m.
  • a distance between the leading edge 11 and the trailing edge 12 being between 0,2 m and 1,5 m.
  • the rotor blade 10 having a trailing edge 12 opposite to the leading edge 11.
  • the rotor blade 10 having a first surface 111 and a second surface 112, the second surface 112 facing towards the axis of rotation R, the first surface 111 facing away from the axis of rotation R.
  • a maximum distance between the first surface 111 and the second surface 112 being between 0,1 m and 1 m.
  • the rotor blade 10 further comprises a support arm 20.
  • the support arm 20 is provided to the rotor blade 10 between the first end 15 and the second end 16 of the rotor blade 10.
  • the support arm 20 is arranged to protrude from the rotor blade 10 in direction away from the rotor blade 10.
  • the support arm 20 is arranged to protrude the second surface 112 of the rotor blade 10.
  • the support arm 20 is arranged to protrude in direction away from the rotor blade 10 and the support arm 20 is arranged to transfer rotational power of the rotor blade 10.
  • the support arm is arranged at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10.
  • the fourth distance G being between 0,8 and 1,2 times the fifth distance H.
  • the support arm is arranged at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10, the fourth distance G being equal to the fifth distance H.
  • the support arm 20 comprises one or more support bars 21. In one embodiment, the support arm 20 comprises two support bars 21.
  • the support bars 21 are in a tilted position. In the context of this application, the support bar 21 is in a tilted position when it has an angle between the horizontal direction in the range of 30 ° to 80 ° or in the range of 100 ° to 150°.
  • the rotor blade 10 comprises a first surface 111 and a second surface 112, and the first surface 111 and the second surface 112 comprises a form of a helical twist between the first end 15 and second end 16 of the rotor blade 10 (not shown in figures).
  • the rotor blade 10 having a cross-section 17.
  • the cross-section 17 of the rotor blade 10 being transverse to a direction between the first end 15 and the second end 16 of the rotor blade 10.
  • the cross-section 17 of the rotor blade 10 being uniform between the first end 15 of the rotor blade 10 and the second end 16 of the rotor blade 10.
  • the support bar 21 having an identical crosssection 17 to the rotor blade 10.
  • the rotor blade 10 being straight between the first end 15 and the second end 16 of the rotor blade 10.
  • the first winglet 13 is fixedly connected to or integrated to the rotor blade 10.
  • the support arm 20 is fixedly connected to or integrated to the rotor blade 10 between the first end 15 and the second end 16 of the rotor blade 10.
  • Figure 2a and 2b show schematically a first winglet and a second winglet a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 further comprises a second winglet 14 provided to the rotor blade 10 in the second end 16 of the rotor blade 10 or in the vicinity of the second end 16 of the rotor blade 10.
  • the second winglet 14 is arranged to protrude from the leading edge 11 in a direction away from the rotor blade 10 and the second winglet 14 is arranged to extend transverse to a direction between the first end 15 and the second end 16 of the rotor blade 10.
  • the rotor blade 10 having a leading surface 18 facing towards a direction of the movement M.
  • leading surface 18 of the blade 10 is a fore surface of the blade 10 which first meets the oncoming air. It should be noted that the leading edge 11 extending on the leading surface 18. In other words, the leading edge 11 is a part of the leading surface 18.
  • the first winglet 13 is arranged to protrude from the leading surface 18.
  • first winglet 13 and the second winglet 14 are arranged to protrude from the leading surface 18.
  • first winglet 13 and the second winglet 14 are fixedly connected to or integrated to the rotor blade 10.
  • the first winglet 13 is arranged to protrude at a first distance A from the rotor blade 10.
  • the first winglet 13 is arranged to protrude from an outer surface 19 of the rotor blade 10 circumferentially at a first distance A from the outer surface 19.
  • the first winglet 13 is arranged to protrude circumferentially from the outer surface 19 of the rotor blade 10 at a first distance A from the rotor blade 10 the outer surface 19 of the rotor blade 10, and the first distance A being uniform.
  • the first distance A being uniform.
  • the second winglet 14 is arranged to protrude at a seventh distance E from the rotor blade 10.
  • the seventh distance E being uniform.
  • first winglet 13 and the second winglet 14 are arranged to have same shape.
  • the second winglet 14 being identical to the first winglet 13.
  • first winglet 13 shown in figures 2a and 2b may be provided to the embodiments shown in figures la and lb.
  • Figure 3a shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
  • the rotor blade 10 having an outer surface 19. The outer surface facing 19 away from the rotor blade 10.
  • the rotor blade 10 having the trailing edge 12 opposite to the leading edge 11.
  • the first winglet 13 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
  • the first winglet 13 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10 and the first winglet 13 is arranged to taper towards the trailing edge 11.
  • the second winglet 14 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
  • the second winglet 14 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10 and the second winglet 14 is arranged to taper towards the trailing edge 11.
  • first winglet 13 shown in figure 3a may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • embodiments of the second winglet 14 shown in figure 3a may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • Figure 3b shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
  • the rotor blade 10 having a first surface 111 and a second surface 112. the second surface 112 facing towards the axis of rotation R.
  • the first surface 111 facing away from the axis of rotation R.
  • the first winglet 13 is arranged to protrude in a direction away from the first surface 111 of the rotor blade 10 and in a direction away from the second surface 112 of the rotor blade 10.
  • first winglet 13 and the second winglet 14 are arranged to protrude in a direction away from the first surface 111 of the rotor blade 10 and in a direction away from the second surface 112 of the rotor blade 10.
  • first winglet 13 shown in figure 3b may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • embodiments of the second winglet 14 shown in figure 3b may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • Figure 3c shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
  • the rotor blade 10 having an outer surface 19. The outer surface facing 19 away from the rotor blade 10.
  • the first winglet 13 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
  • first winglet 13 and the second winglet 14 are arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
  • the first winglet 13 comprises an outer edge 131 and a distance between the outer edge 131 of the first winglet 13 and the outer surface 19 of the rotor blade 10 being uniform.
  • the outer edge being transverse in relation to a direction between the first end 15 and the second end 16 of the rotor blade 10.
  • the first winglet 13 is arranged to protrude at a first distance A from the rotor blade 10, the first distance A being uniform.
  • the first winglet 13 having a shape of droplet.
  • the outer edge 131 of the first winglet 13 is arranged to surround the outer surface 19 of the rotor blade 10, and distance between the outer surface 19 of the rotor blade 10 and the outer edge 131 of the first winglet 13 being the first distance A.
  • the first winglet 13 is arranged to protrude at a first distance A from the rotor blade 10 and the second winglet 14 is arranged to protrude at a seventh distance E from the rotor blade 10, the first distance A being uniform and the seventh distance E being uniform.
  • the first distance A and the seventh distance E are shown in figure 2b.
  • first winglet 13 shown in figure 3c may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • embodiments of the second winglet 14 shown in figure 3c may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • Figure 3d shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
  • the rotor blade 10 having a first surface 111, the first surface 111 facing away from the axis of rotation R, and the first winglet 13 is arranged to protrude from the first surface 111 in a direction away from the axis of rotation R.
  • the rotor blade 10 having a first surface 111, the first surface 111 facing away from the axis of rotation R, and the first winglet 13 and the second winglet 14 are arranged to protrude in a direction from the axis of rotation R.
  • first winglet 13 shown in figure 3d may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • embodiments of the second winglet 14 shown in figure 3d may be provided to the embodiments shown in figures la, lb, 2a and 2b.
  • Figures 4a shows schematically a top view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 comprises the first surface 111.
  • the first surface 111 of the rotor blade 10 comprises a convex portion.
  • the rotor blade 10 comprises the second surface 112, and the second surface 112 of the rotor blade 10 comprises a flat portion.
  • the rotor blade comprises a second surface 112, the second surface 112 is facing towards the axis of rotation R, and the second surface 112 of the rotor blade 10 comprises a concave portion (not shown in figures).
  • the rotor blade comprises a second surface 112, the second surface 112 is facing towards the axis of rotation R, the second surface 112 of the rotor blade 10 comprises a concave portion, the rotor blade comprises a first surface 111, the first surface 111 is facing away from the axis of rotation R, and the first surface 112 of the rotor blade 10 comprises a concave portion (not shown in figures).
  • embodiments of the rotor blade 10 shown in figure 4a may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b and 3c.
  • Figures 4b shows schematically a top view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 comprises the second surface 112, the second surface 112 of the rotor blade 10 is facing towards the axis of rotation R the second surface 112 of the rotor blade 10 comprises a convex portion, the rotor blade 10 comprises a first surface 111, the second surface 112 being identical to the first surface 111.
  • embodiments of the rotor blade 10 shown in figure 4b may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b and 3c.
  • Figures 4c shows schematically a top view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 comprises a second surface 112 facing towards the axis of rotation R, the second surface 112 of the rotor blade 10 comprises a convex portion, the rotor blade 10 comprises a first surface 111 facing away from the axis of rotation R, the rotor blade 10 having a chord line 113, the chord line 113 extends from the leading edge 11 to the trailing edge 12, the chord line 113 being a straight line, the rotor blade 10 having a mean camber line 114, the mean camber line 114 being equidistant from the first surface 111 and the second surface 112 of the rotor blade 10, and the mean camber line 114 is provided between the chord line 113 and the first surface 111.
  • embodiments of the rotor blade 10 shown in figure 4c may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b and 3c.
  • Figure 5a shows schematically an end view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 is arranged to be rotated around the axis of rotation R.
  • the support arm 20 extends at a sixth distance D from the axis of rotation R.
  • the sixth distance D being between 1,5m and 3,5 m.
  • the first end 15 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
  • the first end 15 and the second end 16 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
  • the blade 10 being curved such that the first end 15 and the second end 16 of the rotor blade 10 are arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
  • embodiments of the rotor blade 10 shown in figure 5a may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
  • Figure 5b shows schematically an end view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 is arranged to be rotated around the axis of rotation R.
  • the support arm 20 extends at a sixth distance D from the axis of rotation R.
  • the first end 15 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
  • the first end 15 and the second end 16 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the sixth distance D being greater than the eight distance F.
  • the blade 10 being curved such that the first end 15 and the second end 16 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the sixth distance D being greater than the eight distance F.
  • embodiments of the rotor blade 10 shown in figure 5b may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
  • Figure 5c shows schematically an end view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 having a first thickness W1 at the first end 15 of rotor blade 10, a second thickness W2 at the second end 16 of rotor blade 10 and a third thickness W3 between the first end 15 and the second end 16 of the rotor blade 10. and the third thickness W3 being greater than the first thickness W1 and greater than the second thickness W2.
  • the first thickness Wl, the second thickness W2 and the third thickness W3 are maximum distances between the first surface 111 and second surface 112 of the rotor blade 10 in a direction perpendicular to the chord line 113.
  • the third thickness W3 being at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10, the fourth distance G being between 0,8 and 1,2 times the fifth distance H, and the third thickness W3 being greater than the first thickness W1 and greater than the second thickness W2
  • embodiments of the rotor blade 10 shown in figure 5c may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
  • Figure 5d shows schematically an end view of a rotor blade according to one embodiment of the present invention.
  • the rotor blade 10 having an inner surface 119 and an outer surface 19, the inner surface 119 and the outer surface 19 extending between the first end 15 and the second end 16 of the rotor blade 10 and the rotor blade 10 comprises a blade wall 120 between the inner surface 119 and the outer surface 19.
  • the blade wall 120 comprises a stiffener 130.
  • the blade wall 120 comprises a stiffener 130 at a distance from the first end 15 and a distance from the second end 16.
  • the blade wall 120 comprises a stiffener 130 at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10.
  • the fourth distance G being between 0,8 and 1,2 times the fifth distance H.
  • the blade wall 120 comprises a stiffener 130 at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10.
  • the fourth distance G being between 0,5 and 1,5 times the fifth distance H.
  • the blade wall 120 having a blade wall thickness T2 between the inner surface 119 and the outer surface 19, the stiffener 130 having a stiffener thickness T1 between the inner surface 119 and the outer surface 19, and the stiffener thickness T1 being greater than the blade wall thickness T2.
  • the stiffener 130 protrudes inwards from the inner surface 119.
  • first surface 111 comprises a stiffener 130 and the second surface comprises a stiffener 130.
  • embodiments of the rotor blade 10 shown in figure 5d may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
  • FIG. 6a and 6b show schematically a wind turbine according to one embodiment the present invention.
  • the wind turbine 100 comprises a rotor blade 10.
  • the rotor blade 10 comprises a first winglet 13 provided to the rotor blade 10 in the vicinity of the first end 15 of the rotor blade 10 or in the first end 15 of the rotor blade 10
  • the rotor blade is arranged to be rotated around an axis of rotation R.
  • the rotor blade 10 may be any embodiment of the rotor blade 10 shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b, 4c, 5a and 5b.
  • the rotor blade 10 having a longitudinal direction L between the first end 15 and the second end 16 of the rotor blade 10, and the longitudinal direction L of the rotor blade 10 is positioned in an upright position.
  • the upright position means a direction having an angle between the horizontal direction such that the angle being between 80° and 100°.
  • the rotor blade 10 is positioned at a sixth distance D from the axis of rotation R, and the rotor blade 10 being parallel to the axis of rotation R.
  • the wind turbine 100 comprises a wind power tower 200 and the rotor blade 10 comprises a support arm 20.
  • the support arm 20 is provided to the rotor blade 10 between the first end 15 and the second end 16 of the rotor blade 10.
  • the support arm 20 is arranged to extend from the second surface 112 of the rotor blade 10 towards the wind power tower 200.
  • the support arm 20 is arranged to extend between the second surface 112 of the rotor blade 10 and the wind power tower 200, and the wind power tower 200 is arranged to rotate.
  • the rotor blade 10 having a longitudinal direction L between the first end 15 and the second end 16 of the rotor blade 10, and the longitudinal direction L of the rotor blade 10 is positioned in an upright position, the rotor blade 10 having a first surface 111 and a second surface 112, the second surface 112 facing towards the axis of rotation R, the first surface 111 facing away from the axis of rotation R, the second surface 112 of the rotor blade 10 is positioned at a sixth distance D from the axis of rotation R, and longitudinal direction L of the rotor blade 10 being parallel to the axis of rotation R.
  • the rotor blade 10 is arranged to be rotated around an axis of rotation R, and the axis of rotation R being in an upright position.
  • the support arm 20 is arranged to transfer wind energy from the rotor blade 10 to a wind power generator or to transmission components of the wind power generator. In other words, the support arm 20 is arranged to transfer rotational power from the rotor blade 10 to a wind power generator 100 or to transmission components of the wind power generator 100.
  • the support arm 20 comprises a horizontal bar 2003, a first tie rod 2001 and a second tie rod 2002.
  • the first tie rod 2001 is connected to the rotor blade 10 between the first end 15 of the rotor blade 10 and the horizontal bar 2003 and the second tie rod 2002 is connected to the rotor blade 10 between the second end 16 of the rotor blade 10 and the horizontal bar 2003.
  • first tie rod 2001 and the second tie rod 2002 are fixedly connected to the rotor blade 10.
  • first tie rod 2001 and the second tie rod 2002 being a wire rope.
  • first tie rod 2001 and the second tie rod 2002 being a bar.
  • first tie rod 2001 and the second tie rod 2002 are connected to the wind turbine tower 200 in the vicinity of the support arm 20 or to the support arm 20 in the vicinity of the wind turbine tower 200.
  • the wind turbine 100 comprises one rotor blade 10, and all wind energy of the wind turbine is provided with the one rotor blade 10.
  • wind turbine 100 shown in figures 6a and 6b may comprises two or more rotor blades according to any embodiments shown in figure 7.
  • Figure 7 shows schematically a wind turbine according to one embodiment the present invention.
  • the wind turbine 100 comprises two rotor blades 10, the two rotor blades 10 comprises a first rotor blade 1001 and a second rotor blade 1002, the axis of rotation R is arranged between the first rotor blade 1001 and the second rotor blade 1002, the leading edge 11 of first rotor blade 1001 facing in an opposite direction than the leading edge 11 of second rotor blade 1002 and all wind energy of the wind turbine is provided with the first rotor blade 1001 and with the second rotor blade 1002.
  • the wind turbine 100 comprises three or more rotor blades 10.
  • Figure 8a shows schematically an end view of a wind turbine according to one embodiment of the present invention.
  • the rotor blade 10 is positioned in a tilted position.
  • the first end 15 of the rotor blade 10 is arranged above the second end 16 of the blade 10, the first end 15 is arranged at a second distance B from the axis of rotation R and the second end 16 is arranged at a third distance C from the axis of rotation R, and the second distance B being greater than the third distance C.
  • the rotor blade 10 is arranged to be rotated around an axis of rotation R.
  • the axis of rotation R being in an upright position.
  • the rotor blade 10 is positioned in a tilted position when it has an angle between the horizontal direction in the range of 45 ° to 80 ° or in the range of 100 ° to 125°.
  • the rotor blade 10 being curved such that the first end 15 is arranged at a second distance B from the axis of rotation R, the second end 16 is arranged at a third distance C from the axis of rotation R, the second distance B being greater than third distance C, and the first end 15 being above the second end 16 of the rotor blade 10 (not shown in figures).
  • the rotor blade 10 being curved in relative to the vertical direction, the first end 15 is arranged at a second distance B from the axis of rotation R, the second end 16 is arranged at a third distance C from the axis of rotation R, the second distance B being greater than third distance C, and the first end 15 being above the second end 16 of the rotor blade 10 (not shown in figures).
  • the rotor blade 10 being curved relative to the vertical direction (not shown in figures) and the first end 15 being above the second end 16 of the rotor blade 10.
  • the rotor blade 10 being curved in the vertical direction (not shown in figures) the first end 15 being above the second end 16 of the rotor blade 10.
  • Figure 8b shows schematically an end view of a wind turbine according to one embodiment of the present invention.
  • the rotor blade 10 is positioned in a tilted position.
  • the first end 15 of the rotor blade 10 is arranged above the second end 16 of the blade 10, the first end 15 is arranged at a second distance B from the axis of rotation R and the second end 16 is arranged at a third distance C from the axis of rotation R, and the third distance C being greater than the second distance B.
  • the rotor blade 10 is arranged to be rotated around an axis of rotation R.
  • the axis of rotation R being in an upright position. It should be noted that the rotor blade 10 of the embodiments shown in figures 6a, 6b and 7 may be in a tilted position as shown in figures 8a and 8b.

Abstract

The invention relates to a wind turbine (100). The wind turbine (100) comprises a rotor blade (10). The rotor blade (10) comprises a first winglet (13) provided to the rotor blade (10) in the vicinity of the first end (15) of the rotor blade (10) or in the first end (15) of the rotor blade (10). The rotor blade is arranged to be rotated around an axis of rotation (R). The invention further relates to a rotor blade (10).

Description

A ROTOR BLADE AND A WIND TURBINE
FIELD OF THE INVENTION
The present invention relates to a rotor blade and more particularly to a rotor blade according to the preamble of claim 1.
The present invention further relates to a wind turbine and more particularly to a wind turbine according to the preamble of claim 12.
BACKGROUND OF THE INVENTION
In the prior art wind turbines have rotor blades. A wind rotates rotor blades and rotation of the rotor blades is converted to electric power. The rotor blades are arranged to rotate around a rotation axis which is typically positioned vertically or horizontally.
Vertical axis wind turbines are typically used for installations where wind conditions are not consistent, or due to public ordinances the turbine cannot be placed high enough to benefit from steady wind. Vertical axis wind turbines may have major components close to the ground. The presence of the energy sensor near the ground exposes it to turbulence and wind gradient, which reduces its effectiveness. In a vertical system, air flowing from any direction or speed can rotate the blades. The vertical axis wind turbines may be equipped with low-speed blades. Typically, the unit has two or three blades and can be shorter and closer to the ground than a horizontal system. Not all of the rotor blades of a vertical axis wind turbine produce torque at the same time, which limits the efficiency of vertical systems in producing energy. Other blades are simply pushed along. There is also more drag on the blades when they rotate. The aerodynamic drag created by an airfoil of the rotor blades decreases efficiency of wind turbine. A low starting torque can limit functionality of vertical axis wind turbines.
BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention is to provide a rotor blade and a wind turbine so as to overcome or at least alleviate the prior art disadvantages.
The objects of the invention are achieved by a rotor blade which is characterized by what is stated in the independent claim 1. The objects of the invention are achieved by a wind turbine which is characterized by what is stated in the independent claim 12.
The preferred embodiments of the invention are disclosed in the dependent claims.
The invention is based on the idea of providing a rotor blade for a wind turbine. The rotor blade is arranged to be rotated around an axis of rotation. The rotor blade having a first end and a second end, the rotor blade having a leading edge extending between the first end and the second end of the rotor blade, and the leading edge is arranged to lead the rotor blade in a movement around the axis of rotation of the rotor blade. The rotor blade comprises a first winglet provided to the rotor blade in the first end of the rotor blade or in the vicinity of the first end of the rotor blade, the first winglet is arranged to protrude from the rotor blade and the first winglet is arranged to extend in a direction transverse to a direction between the first end and the second end of the rotor blade.
In the context of this application, a wind turbine means a wind-powered electrical generator. A wind turbine is a device that converts the wind's kinetic energy into electrical energy.
In one embodiment, the rotor blade further comprises a second winglet provided to the rotor blade in the second end of the rotor blade or in the vicinity of the second end of the rotor blade, the second winglet is arranged to protrude from the rotor blade and the second winglet is arranged to extend transverse to a direction between the first end and the second end of the rotor blade.
In an alternative embodiment, the rotor blade further comprises a second winglet provided to the rotor blade in the second end of the rotor blade or in the vicinity of the second end of the rotor blade, the second winglet is arranged to protrude from the leading edge in a direction away from the rotor blade and the second winglet is arranged to extend transverse to a direction between the first end and the second end of the rotor blade.
The second winglet further decreases the aerodynamic drag created by an airfoil.
In one embodiment, the rotor blade having a cross-section, the crosssection of the rotor blade being transverse to a direction between the first end and the second end of the rotor blade, and the cross-section of the rotor blade being uniform between the first end of the rotor blade and the second end of the rotor blade.
This kind of rotor blade is simple to manufacture, and the rotor blade has a large area against a wind.
In an alternative embodiment, the rotor blade having a first thickness at the first end of rotor blade, a second thickness at the second end of rotor blade and a third thickness between the first end and the second end of the rotor blade and the third thickness being greater than the first thickness and greater than the second thickness.
The greater third thickness increases stiffness of the rotor blade.
In one embodiment, the rotor blade having an inner surface and an outer surface, the inner surface and the outer surface extending between the first end and the second end of the rotor blade and the rotor blade comprises a blade wall between the inner surface and the outer surface, and the blade wall comprises a stiffener.ln one embodiment, the rotor blade having a first surface, the first surface facing away from the axis of rotation, and the first winglet is arranged to protrude from the first surface in a direction away from the axis of rotation.
This further decreases the aerodynamic drag created by an airfoil.
In an alternative embodiment, the rotor blade having a first surface, the first surface facing away from the axis of rotation, and the first winglet and the second winglet are arranged to protrude in a direction from the axis of rotation.
This further decreases the aerodynamic drag created by an airfoil.
In an another alternative embodiment, the rotor blade having a leading surface facing towards a direction of the movement, and the first winglet is arranged to protrude from the leading surface.
This further decreases the aerodynamic drag created by an airfoil.
- the rotor blade having a leading surface facing towards a direction of the movement, and the first winglet and the second winglet are arranged to protrude from the leading surface.
This further decreases the aerodynamic drag created by an airfoil.
In one embodiment, the rotor blade having an outer surface, the outer surface facing away from the rotor blade, and the first winglet is arranged to protrude from the outer surface of the rotor blade in a direction away from the rotor blade.
This further decreases the aerodynamic drag created by an airfoil.
In an alternative embodiment, the rotor blade having an outer surface, the outer surface facing away from the rotor blade, the first winglet and the second winglet are arranged to protrude from the outer surface of the rotor blade in a direction away from the rotor blade.
This further decreases the aerodynamic drag created by an airfoil. In another alternative embodiment, the rotor blade having a first surface and a second surface, the second surface facing towards the axis of rotation, the first surface facing away from the axis of rotation, and the first winglet is arranged to protrude in a direction away from the first surface of the rotor blade and in a direction away from the second surface of the rotor blade.
This further decreases the aerodynamic drag created by an airfoil.
In a yet another alternative embodiment, the rotor blade having a first surface and a second surface, the second surface facing towards the axis of rotation, the first surface facing away from the axis of rotation, and the first winglet and the second winglet are arranged to protrude in a direction away from the first surface of the rotor blade and in a direction away from the second surface of the rotor blade.
This further decreases the aerodynamic drag created by an airfoil.
In a yet another alternative embodiment, the first winglet is arranged to protrude from the leading edge in a direction away from the rotor blade and the first winglet is arranged to extend in a direction transverse to a direction between the first end and the second end of the rotor blade.
This further decreases the aerodynamic drag created by an airfoil.
In a yet another alternative embodiment, the rotor blade having a trailing edge opposite to the leading edge, the first winglet is arranged to protrude from the leading edge in a direction away from the trailing edge, and the first winglet is arranged to extend in a direction transverse to a direction between the first end and the second end of the rotor blade.
This further decreases the aerodynamic drag created by an airfoil.
In one embodiment, the rotor blade having a trailing edge opposite to the leading edge, and the first winglet is arranged to taper towards the trailing edge.
In an alternative embodiment, the rotor blade having a trailing edge opposite to the leading edge, and the first winglet and the second winglet are arranged to taper towards the trailing edge.
In another alternative embodiment, the first winglet is arranged to protrude at a first distance from the rotor blade.
In a yet alternative embodiment, the first winglet is arranged to protrude from an outer surface of the rotor blade circumferentially at a first distance from the outer surface.
In a yet alternative embodiment, the first winglet is arranged to protrude circumferentially from an outer surface of the rotor blade at a first distance from the outer surface of the rotor blade, and the first distance being uniform. In a yet alternative embodiment, the first winglet is arranged to protrude at a first distance from the rotor blade and the second winglet is arranged to protrude at a seventh distance from the rotor blade, the first distance being uniform and the seventh distance being uniform.
In a yet alternative embodiment, the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a distance from the outer surface.
In a yet alternative embodiment the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a first distance from the outer surface, and the first distance being uniform.
In a yet alternative embodiment, the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a distance from the outer surface, and the second winglet being identical to the first winglet.
In a yet alternative embodiment, the first winglet comprises an outer edge, the outer edge of the first winglet is arranged to surround the outer surface of the rotor blade at a first distance from the outer surface, and the second winglet being identical to the first winglet.
In one embodiment, the axis of rotation is arranged to be in an upright position to extend parallel to a direction between a first end and the second end of the rotor blade.
In an alternative embodiment, the axis of rotation is arranged to extend in a direction parallel to a direction between a first end and the second end of the rotor blade and the support arm is provided between the second surface of the rotor blade and the axis of rotation. In one embodiment, the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade.
In an alternative embodiment, the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, and the support arm is arranged to protrude from the second surface of the rotor blade in direction away from the rotor blade. In another alternative embodiment, the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, the support arm is arranged to protrude in direction away from the rotor blade and the support arm is arranged to transfer rotational power of the rotor blade.
In a yet another alternative embodiment, the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, the support arm is arranged to protrude from the second surface of the rotor blade in direction away from the rotor blade, the support arm comprises one or more support bars and the support arm is arranged to transfer rotational power of the rotor blade.
In a yet another alternative embodiment, the rotor blade comprises a support arm, the support arm is provided to the rotor blade between the first end and the second end of the rotor blade, the support arm is arranged to protrude in direction away from the rotor blade, the support arm comprises two or more support bars, the two or more support bars and the support arm is arranged to transfer rotational power of the rotor blade.
The support arm is arranged to transfer rotational power from the rotor blade to a wind power generator or to transmission components of the wind power generator or to a rotatable wind power tower.
In one embodiment, the rotor blade comprises a second surface facing towards the axis of rotation, and the second surface of the rotor blade comprises a flat portion.
In an alternative embodiment, the rotor blade comprises a second surface facing towards the axis of rotation, and the second surface of the rotor blade comprises a convex portion.
In another alternative embodiment, the rotor blade comprises a second surface facing towards the axis of rotation, the second surface of the rotor blade comprises a convex portion, the rotor blade comprises a first surface facing away from the axis of rotation, the rotor blade having a chord line, the chord line extends from the leading edge to the trailing edge, the chord line being a straight line, the rotor blade having a mean camber line, the mean camber line being equidistant from the first surface and the second surface of the rotor blade, and the mean camber line is provided between the chord line and the first surface.
In a yet another alternative embodiment, the rotor blade comprises a second surface, the second surface is facing towards the axis of rotation, the second surface of the rotor blade comprises a convex portion, the rotor blade comprises a first surface facing towards the axis of rotation, and the second surface being identical to the first surface.
In a yet another alternative embodiment, the rotor blade comprises a second surface, the second surface is facing towards the axis of rotation, the second surface of the rotor blade comprises a concave portion.
In one embodiment, the rotor blade comprises a first surface and a second surface, and the first surface and the second surface comprise a form of a helix between the first end and second end of the rotor blade.
In other words, the rotor blade comprises a first surface and a second surface, and the first surface and the second surface comprise a form of a helical twist between the first end and second end of the rotor blade.
In this context, helix means a curve that goes around a central tube in the form of a spiral. In other words, the rotor blade having a shape of spiral.
In one embodiment, the rotor blade comprises a first surface, and the first surface of the rotor blade comprises a convex portion.
The convex portion of the first surface increases aerodynamic efficiency of the rotor blade.
In one embodiment, the rotor blade comprises a second surface, and the second surface of the rotor blade comprises a flat portion.
The convex portion of the second surface further increases aerodynamic efficiency of the rotor blade.
In one embodiment, the first winglet is fixedly connected to or integrated to the rotor blade.
In an alternative embodiment, the first winglet and the second winglet are fixedly connected to or integrated to the rotor blade.
In another alternative embodiment, the support arm is fixedly connected to or integrated to the rotor blade between the first end and the second end of the rotor blade.
In a yet another alternative embodiment, the first winglet is fixedly connected to or integrated to the rotor blade and the support arm is fixedly connected to or integrated to the rotor blade between the first end and the second end of the rotor blade.
In a yet another alternative embodiment, the first winglet and the second winglet are fixedly connected to or integrated to the rotor blade and the support arm is fixedly connected to or integrated to the rotor blade between the first end and the second end of the rotor blade.
The present invention provides a wind turbine. The wind turbine comprises a rotor blade. The rotor blade comprises a first winglet provided to the rotor blade in the vicinity of the first end of the rotor blade or in the first end of the rotor blade, and the rotor blade is arranged to be rotated around an axis of rotation. The axis of rotation R being in an upright position.
In one embodiment, the rotor blade having a longitudinal direction between the first end and the second end of the rotor blade, and the longitudinal direction of the rotor blade is positioned in an upright position.
In an alternative embodiment, the rotor blade having a longitudinal direction between the first end and the second end of the rotor blade, and the longitudinal direction of the rotor blade is positioned in an upright position, the rotor blade having a first surface and a second surface, the second surface facing towards the axis of rotation, the first surface facing away from the axis of rotation, the second surface of the rotor blade is positioned at a sixth distance from the axis of rotation, and longitudinal direction of the rotor blade being parallel to the axis of rotation.
The longitudinal direction of the rotor blade is positioned in an upright position provides a rotor blade such that a weight of the rotor blade does not cause a bending moment to the rotor blade
In another alternative embodiment, the rotor blade is positioned in a tilted position.
In a yet alternative embodiment, the rotor blade is positioned in a tilted position, the first end of the rotor blade is arranged above the second end of the blade, the first end is arranged at a second distance from the axis of rotation and the second end is arranged at a third distance from the axis of rotation, and the second distance being greater than the third distance; or
In a yet alternative embodiment, the rotor blade is positioned in a tilted position, the first end of the rotor blade is arranged above the second end of the blade, the first end is arranged at a second distance from the axis of rotation and the second is arranged at a third distance from the axis of rotation, and the third distance being greater than the second distance.
In one embodiment, the rotor blade is arranged to be rotated around an axis of rotation, and the axis of rotation being in an upright position.
In one embodiment, the wind turbine comprises one rotor blade, and all wind energy of the wind turbine is provided with the one rotor blade.
The wind turbine is arranged to convert kinetic energy of a wind into electric energy. In this context all wind energy of the wind turbine means all kinetic energy of the wind which the wind turbine converts into electric energy with the wind turbine.
In one embodiment, the wind turbine comprises one rotor blade, and all kinetic energy of the wind turbine is provided with the one rotor blade.
In other words, the wind turbine comprises only one rotor blade. This reduces number of rotor blades and thus, the structure of the wind turbine is simple.
In an alternative embodiment, the wind turbine comprises two rotor blades, the two rotor blades comprises a first rotor blade and a second rotor blade, the axis of rotation is arranged between the first rotor blade and the second rotor blade, the leading edge of first rotor blade facing in an opposite direction than the leading edge of second rotor blade and all wind energy of the wind turbine is provided with the first rotor blade and with the second rotor blade. In another alternative embodiment, the wind turbine comprises three or more rotor blades.
In one embodiment, the rotor blade of the wind turbine being a rotor blade according to any above disclosed embodiment of the rotor blade.
An advantage of the invention is that it enables improving an efficiency of wind turbine. The invention improving especially an efficiency of a vertical axis wind turbine. The invention enables reducing a drag of rotor blade. Furthermore, the rotor blade according to present invention is simple to manufacture.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in detail by means of specific embodiments with reference to the enclosed drawings, in which
Figure la shows schematically a top view of a rotor blade according to one embodiment the present invention;
Figure lb shows schematically an end view of a rotor blade of figure la;
Figure 2a shows schematically a top view of a first winglet and a second winglet of a rotor blade according to one embodiment the present invention;
Figure 2b shows schematically a side view of the first winglet and the second winglet of a rotor blade of figure 2a;
Figures 3a, 3b, 3c and 3d show schematically a top view of different embodiments of a first winglet and a second winglet of a rotor blade according to the present invention;
Figures 4a, 4b and 4c show schematically a top view of different embodiments of a rotor blade according to the present invention;
Figures 5a, 5b, 5c and 5d show schematically an end view of a rotor blade according to different embodiments of the present invention;
Figure 6a shows schematically a top view of a wind turbine according to one embodiment the present invention;
Figure 6b shows schematically an end view of a wind turbine of figure 6a;
Figure 7 shows schematically a top view of a wind turbine according to one embodiment the present invention; and
Figures 8a and 8b show schematically an end view of a wind turbine according to different embodiments of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Figure la and lb show a rotor blade according to one embodiment of the present invention 1. The rotor blade 10 is arranged to be rotated around an axis of rotation R. The rotor blade 10 having a first end 15 and a second end 16. The rotor blade 10 having a leading edge 11 extending between the first end 15 and the second end 16 of the rotor blade 10. The leading edge 13 is arranged to lead the rotor blade 10 in a movement M around the axis of rotation R of the rotor blade 10. In other words, the movement M being rotational movement and the leading edge 11 is arranged to lead the rotor blade 10 in the rotational movement.
The rotor blade comprises a first winglet 13 provided to the rotor blade 10 in the first end 15 of the rotor blade 10 or in the vicinity of the first end 15 of the rotor blade 10, the first winglet 13 is arranged to protrude from the leading edge 11 in a direction away from the rotor blade 10 and the first winglet 13 is arranged to extend in a direction transverse to a direction between the first end 15 and the second end 16 of the rotor blade 10.
In other words, the first winglet 13 is arranged to extend in a direction transverse relative to a direction between the first end 15 and the second end 16 of the rotor blade 10.
In one embodiment, the first winglet 13 being a plate.
In one embodiment, the second winglet 14being a plate. In one embodiment, the first winglet 13 being a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 30° and 150°.
In one embodiment, the first winglet 13 is a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 45° and 135°.
In one embodiment, the first winglet 13 is a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 85° and 95°.
In one embodiment, the first winglet 13 is a plate, and an angle between the first winglet 13 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is 90°.
In one embodiment, the second winglet 14 being a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 30° and 150°.
In one embodiment, the second winglet 14 is a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 45° and 135°.
In one embodiment, the second winglet 14 is a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is between 85° and 95°.
In one embodiment, the second winglet 14 is a plate, and an angle between the second winglet 14 and a direction between the first end 15 and the second end 16 of the rotor blade 10 is 90°.
In the context of this application, the leading edge 11 of the rotor blade 10 is the foremost edge and the leading edge 11 is therefore the part which first meets the oncoming air.
The rotor blade 10 having a longitudinal direction L between the first end 15 and the second end 16 of the rotor blade 10. The longitudinal direction L of the rotor blade 10 is arranged to be positioned in an upright position.
In one embodiment, the axis of rotation R is arranged to be in an upright position.
In the context of this application the upright position means a direction having an angle between the horizontal direction such that the angle being between 80° and 100°.
In one embodiment, the rotor blade 10 is arranged to be rotated around the axis of rotation R at a sixth distance D from the axis of rotation R. The rotor blade 10 may be made with fibreglass-reinforced polyester, epoxy, carbon fibre, aramid (Kevlar), wood-epoxy or wood-fibre-epoxy.
The rotor blade 10 may be manufactured with an extrusion machine by pushing material through a die of the desired cross-section or with a drawing machine using the tensile strength of the material to pull it through the die or with a 3D-printing machine or with a mould.
Typically, a distance between the first end 15 and the second end 16 of the rotor blade 10 being between 4 m and 6 m.
Typically, a distance between the leading edge 11 and the trailing edge 12 being between 0,2 m and 1,5 m.
The rotor blade 10 having a trailing edge 12 opposite to the leading edge 11.
The rotor blade 10 having a first surface 111 and a second surface 112, the second surface 112 facing towards the axis of rotation R, the first surface 111 facing away from the axis of rotation R. Typically, a maximum distance between the first surface 111 and the second surface 112 being between 0,1 m and 1 m.
In one embodiment, the rotor blade 10 further comprises a support arm 20. The support arm 20 is provided to the rotor blade 10 between the first end 15 and the second end 16 of the rotor blade 10.
In one embodiment, the support arm 20 is arranged to protrude from the rotor blade 10 in direction away from the rotor blade 10.
In one embodiment, the support arm 20 is arranged to protrude the second surface 112 of the rotor blade 10.
The support arm 20 is arranged to protrude in direction away from the rotor blade 10 and the support arm 20 is arranged to transfer rotational power of the rotor blade 10.
In one embodiment, the support arm is arranged at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10. The fourth distance G being between 0,8 and 1,2 times the fifth distance H.
In one embodiment, the support arm is arranged at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10, the fourth distance G being equal to the fifth distance H.
In one embodiment the support arm 20 comprises one or more support bars 21. In one embodiment, the support arm 20 comprises two support bars 21. The support bars 21 are in a tilted position. In the context of this application, the support bar 21 is in a tilted position when it has an angle between the horizontal direction in the range of 30 ° to 80 ° or in the range of 100 ° to 150°.
In one embodiment, the rotor blade 10 comprises a first surface 111 and a second surface 112, and the first surface 111 and the second surface 112 comprises a form of a helical twist between the first end 15 and second end 16 of the rotor blade 10 (not shown in figures).
In one embodiment, the rotor blade 10 having a cross-section 17. The cross-section 17 of the rotor blade 10 being transverse to a direction between the first end 15 and the second end 16 of the rotor blade 10. The cross-section 17 of the rotor blade 10 being uniform between the first end 15 of the rotor blade 10 and the second end 16 of the rotor blade 10.
In one embodiment, the support bar 21 having an identical crosssection 17 to the rotor blade 10.
In one embodiment, the rotor blade 10 being straight between the first end 15 and the second end 16 of the rotor blade 10.
In one embodiment, the first winglet 13 is fixedly connected to or integrated to the rotor blade 10.
In one embodiment, the support arm 20 is fixedly connected to or integrated to the rotor blade 10 between the first end 15 and the second end 16 of the rotor blade 10.
Figure 2a and 2b show schematically a first winglet and a second winglet a rotor blade according to one embodiment of the present invention.
In this embodiment, the rotor blade 10 further comprises a second winglet 14 provided to the rotor blade 10 in the second end 16 of the rotor blade 10 or in the vicinity of the second end 16 of the rotor blade 10. The second winglet 14 is arranged to protrude from the leading edge 11 in a direction away from the rotor blade 10 and the second winglet 14 is arranged to extend transverse to a direction between the first end 15 and the second end 16 of the rotor blade 10.
The rotor blade 10 having a leading surface 18 facing towards a direction of the movement M.
In this context, the leading surface 18 of the blade 10 is a fore surface of the blade 10 which first meets the oncoming air. It should be noted that the leading edge 11 extending on the leading surface 18. In other words, the leading edge 11 is a part of the leading surface 18.
In one embodiment, the first winglet 13 is arranged to protrude from the leading surface 18.
In one embodiment, the first winglet 13 and the second winglet 14 are arranged to protrude from the leading surface 18.
In one embodiment, the first winglet 13 and the second winglet 14 are fixedly connected to or integrated to the rotor blade 10.
In one embodiment, the first winglet 13 is arranged to protrude at a first distance A from the rotor blade 10.
In one embodiment, the first winglet 13 is arranged to protrude from an outer surface 19 of the rotor blade 10 circumferentially at a first distance A from the outer surface 19.
In one embodiment, the first winglet 13 is arranged to protrude circumferentially from the outer surface 19 of the rotor blade 10 at a first distance A from the rotor blade 10 the outer surface 19 of the rotor blade 10, and the first distance A being uniform.
In one embodiment, the first distance A being uniform.
In one embodiment, the second winglet 14 is arranged to protrude at a seventh distance E from the rotor blade 10.
In one embodiment, the seventh distance E being uniform.
In one embodiment the first winglet 13 and the second winglet 14 are arranged to have same shape.
In one embodiment, the second winglet 14 being identical to the first winglet 13.
It should be noted that the embodiments of the second winglet 14 shown in figures 2a and 2b may be provided to the embodiments shown in figures la and lb.
It should be noted that the embodiments of the first winglet 13 shown in figures 2a and 2b may be provided to the embodiments shown in figures la and lb.
Figure 3a shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
The rotor blade 10 having an outer surface 19. The outer surface facing 19 away from the rotor blade 10. The rotor blade 10 having the trailing edge 12 opposite to the leading edge 11.
In one embodiment, the first winglet 13 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
In one embodiment, the first winglet 13 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10 and the first winglet 13 is arranged to taper towards the trailing edge 11.
In one embodiment, the second winglet 14 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
In one embodiment, the second winglet 14 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10 and the second winglet 14 is arranged to taper towards the trailing edge 11.
It should be noted that embodiments of the first winglet 13 shown in figure 3a may be provided to the embodiments shown in figures la, lb, 2a and 2b.
It should be noted that embodiments of the second winglet 14 shown in figure 3a may be provided to the embodiments shown in figures la, lb, 2a and 2b.
Figure 3b shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
The rotor blade 10 having a first surface 111 and a second surface 112. the second surface 112 facing towards the axis of rotation R. The first surface 111 facing away from the axis of rotation R.
In one embodiment, the first winglet 13 is arranged to protrude in a direction away from the first surface 111 of the rotor blade 10 and in a direction away from the second surface 112 of the rotor blade 10.
In one embodiment, the first winglet 13 and the second winglet 14 are arranged to protrude in a direction away from the first surface 111 of the rotor blade 10 and in a direction away from the second surface 112 of the rotor blade 10.
It should be noted that embodiments of the first winglet 13 shown in figure 3b may be provided to the embodiments shown in figures la, lb, 2a and 2b.
It should be noted that embodiments of the second winglet 14 shown in figure 3b may be provided to the embodiments shown in figures la, lb, 2a and 2b.
Figure 3c shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade. The rotor blade 10 having an outer surface 19. The outer surface facing 19 away from the rotor blade 10.
In one embodiment, the first winglet 13 is arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
In one embodiment, the first winglet 13 and the second winglet 14 are arranged to protrude from the outer surface 19 of the rotor blade 10 in a direction away from the rotor blade 10.
In one embodiment, the first winglet 13 comprises an outer edge 131 and a distance between the outer edge 131 of the first winglet 13 and the outer surface 19 of the rotor blade 10 being uniform.
The outer edge being transverse in relation to a direction between the first end 15 and the second end 16 of the rotor blade 10.
In one embodiment, the first winglet 13 is arranged to protrude at a first distance A from the rotor blade 10, the first distance A being uniform.
In one embodiment, the first winglet 13 having a shape of droplet.
In one embodiment, the outer edge 131 of the first winglet 13 is arranged to surround the outer surface 19 of the rotor blade 10, and distance between the outer surface 19 of the rotor blade 10 and the outer edge 131 of the first winglet 13 being the first distance A.
In one embodiment, the first winglet 13 is arranged to protrude at a first distance A from the rotor blade 10 and the second winglet 14 is arranged to protrude at a seventh distance E from the rotor blade 10, the first distance A being uniform and the seventh distance E being uniform. The first distance A and the seventh distance E are shown in figure 2b.
It should be noted that embodiments of the first winglet 13 shown in figure 3c may be provided to the embodiments shown in figures la, lb, 2a and 2b.
It should be noted that embodiments of the second winglet 14 shown in figure 3c may be provided to the embodiments shown in figures la, lb, 2a and 2b.
Figure 3d shows schematically a top view of one embodiment of a first winglet and a second winglet of a rotor blade.
In one embodiment, the rotor blade 10 having a first surface 111, the first surface 111 facing away from the axis of rotation R, and the first winglet 13 is arranged to protrude from the first surface 111 in a direction away from the axis of rotation R.
In one embodiment, the rotor blade 10 having a first surface 111, the first surface 111 facing away from the axis of rotation R, and the first winglet 13 and the second winglet 14 are arranged to protrude in a direction from the axis of rotation R.
It should be noted that embodiments of the first winglet 13 shown in figure 3d may be provided to the embodiments shown in figures la, lb, 2a and 2b.
It should be noted that embodiments of the second winglet 14 shown in figure 3d may be provided to the embodiments shown in figures la, lb, 2a and 2b.
Figures 4a shows schematically a top view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 comprises the first surface 111. The first surface 111 of the rotor blade 10 comprises a convex portion.
In one embodiment, the rotor blade 10 comprises the second surface 112, and the second surface 112 of the rotor blade 10 comprises a flat portion.
In an alternative embodiment, the rotor blade comprises a second surface 112, the second surface 112 is facing towards the axis of rotation R, and the second surface 112 of the rotor blade 10 comprises a concave portion (not shown in figures).
In another alternative embodiment, the rotor blade comprises a second surface 112, the second surface 112 is facing towards the axis of rotation R, the second surface 112 of the rotor blade 10 comprises a concave portion, the rotor blade comprises a first surface 111, the first surface 111 is facing away from the axis of rotation R, and the first surface 112 of the rotor blade 10 comprises a concave portion (not shown in figures).
It should be noted that embodiments of the rotor blade 10 shown in figure 4a may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b and 3c.
Figures 4b shows schematically a top view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 comprises the second surface 112, the second surface 112 of the rotor blade 10 is facing towards the axis of rotation R the second surface 112 of the rotor blade 10 comprises a convex portion, the rotor blade 10 comprises a first surface 111, the second surface 112 being identical to the first surface 111.
It should be noted that embodiments of the rotor blade 10 shown in figure 4b may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b and 3c.
Figures 4c shows schematically a top view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 comprises a second surface 112 facing towards the axis of rotation R, the second surface 112 of the rotor blade 10 comprises a convex portion, the rotor blade 10 comprises a first surface 111 facing away from the axis of rotation R, the rotor blade 10 having a chord line 113, the chord line 113 extends from the leading edge 11 to the trailing edge 12, the chord line 113 being a straight line, the rotor blade 10 having a mean camber line 114, the mean camber line 114 being equidistant from the first surface 111 and the second surface 112 of the rotor blade 10, and the mean camber line 114 is provided between the chord line 113 and the first surface 111.
It should be noted that embodiments of the rotor blade 10 shown in figure 4c may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b and 3c.
Figure 5a shows schematically an end view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 is arranged to be rotated around the axis of rotation R. The support arm 20 extends at a sixth distance D from the axis of rotation R.
Typically, the sixth distance D being between 1,5m and 3,5 m.
In one embodiment, the first end 15 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
In one embodiment, the first end 15 and the second end 16 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
In one embodiment, the blade 10 being curved such that the first end 15 and the second end 16 of the rotor blade 10 are arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D. It should be noted that embodiments of the rotor blade 10 shown in figure 5a may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
Figure 5b shows schematically an end view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 is arranged to be rotated around the axis of rotation R. The support arm 20 extends at a sixth distance D from the axis of rotation R.
In one embodiment, the first end 15 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the eight distance F being greater than the sixth distance D.
In one embodiment, the first end 15 and the second end 16 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the sixth distance D being greater than the eight distance F. In one embodiment, the blade 10 being curved such that the first end 15 and the second end 16 of the rotor blade 10 is arranged at an eight distance F from the axis of rotation R, and the sixth distance D being greater than the eight distance F.
It should be noted that embodiments of the rotor blade 10 shown in figure 5b may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
Figure 5c shows schematically an end view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 having a first thickness W1 at the first end 15 of rotor blade 10, a second thickness W2 at the second end 16 of rotor blade 10 and a third thickness W3 between the first end 15 and the second end 16 of the rotor blade 10. and the third thickness W3 being greater than the first thickness W1 and greater than the second thickness W2.
In the context of this application, the first thickness Wl, the second thickness W2 and the third thickness W3 are maximum distances between the first surface 111 and second surface 112 of the rotor blade 10 in a direction perpendicular to the chord line 113.
In other words, the maximum distances being measured in a direction perpendicular to the chord line 113.
In one embodiment, the third thickness W3 being at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10, the fourth distance G being between 0,8 and 1,2 times the fifth distance H, and the third thickness W3 being greater than the first thickness W1 and greater than the second thickness W2
It should be noted that embodiments of the rotor blade 10 shown in figure 5c may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
Figure 5d shows schematically an end view of a rotor blade according to one embodiment of the present invention.
The rotor blade 10 having an inner surface 119 and an outer surface 19, the inner surface 119 and the outer surface 19 extending between the first end 15 and the second end 16 of the rotor blade 10 and the rotor blade 10 comprises a blade wall 120 between the inner surface 119 and the outer surface 19.
In one embodiment, the blade wall 120 comprises a stiffener 130.
In one embodiment, the blade wall 120 comprises a stiffener 130 at a distance from the first end 15 and a distance from the second end 16.
In one embodiment, the blade wall 120 comprises a stiffener 130 at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10. The fourth distance G being between 0,8 and 1,2 times the fifth distance H.
In one embodiment, the blade wall 120 comprises a stiffener 130 at a fourth distance G from the first end 15 of the rotor blade 10 and a fifth distance H from the second end 16 of the rotor blade 10. The fourth distance G being between 0,5 and 1,5 times the fifth distance H.
In one embodiment, the blade wall 120 having a blade wall thickness T2 between the inner surface 119 and the outer surface 19, the stiffener 130 having a stiffener thickness T1 between the inner surface 119 and the outer surface 19, and the stiffener thickness T1 being greater than the blade wall thickness T2.
In one embodiment, the stiffener 130 protrudes inwards from the inner surface 119.
In one embodiment, first surface 111 comprises a stiffener 130 and the second surface comprises a stiffener 130.
It should be noted that embodiments of the rotor blade 10 shown in figure 5d may be provided to the embodiments shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b and 4c.
Figure 6a and 6b show schematically a wind turbine according to one embodiment the present invention. The wind turbine 100 comprises a rotor blade 10. The rotor blade 10 comprises a first winglet 13 provided to the rotor blade 10 in the vicinity of the first end 15 of the rotor blade 10 or in the first end 15 of the rotor blade 10 The rotor blade is arranged to be rotated around an axis of rotation R.
It should be noted that the rotor blade 10 may be any embodiment of the rotor blade 10 shown in figures la, lb, 2a, 2b, 3a, 3b, 3c, 4a, 4b, 4c, 5a and 5b.
In one embodiment, the rotor blade 10 having a longitudinal direction L between the first end 15 and the second end 16 of the rotor blade 10, and the longitudinal direction L of the rotor blade 10 is positioned in an upright position.
In this context the upright position means a direction having an angle between the horizontal direction such that the angle being between 80° and 100°.
In one embodiment, the rotor blade 10 is positioned at a sixth distance D from the axis of rotation R, and the rotor blade 10 being parallel to the axis of rotation R.
In one embodiment, the wind turbine 100 comprises a wind power tower 200 and the rotor blade 10 comprises a support arm 20. The support arm 20 is provided to the rotor blade 10 between the first end 15 and the second end 16 of the rotor blade 10. The support arm 20 is arranged to extend from the second surface 112 of the rotor blade 10 towards the wind power tower 200.
In one embodiment, the support arm 20 is arranged to extend between the second surface 112 of the rotor blade 10 and the wind power tower 200, and the wind power tower 200 is arranged to rotate.
In one embodiment, the rotor blade 10 having a longitudinal direction L between the first end 15 and the second end 16 of the rotor blade 10, and the longitudinal direction L of the rotor blade 10 is positioned in an upright position, the rotor blade 10 having a first surface 111 and a second surface 112, the second surface 112 facing towards the axis of rotation R, the first surface 111 facing away from the axis of rotation R, the second surface 112 of the rotor blade 10 is positioned at a sixth distance D from the axis of rotation R, and longitudinal direction L of the rotor blade 10 being parallel to the axis of rotation R.
In one embodiment, the rotor blade 10 is arranged to be rotated around an axis of rotation R, and the axis of rotation R being in an upright position.
The support arm 20 is arranged to transfer wind energy from the rotor blade 10 to a wind power generator or to transmission components of the wind power generator. In other words, the support arm 20 is arranged to transfer rotational power from the rotor blade 10 to a wind power generator 100 or to transmission components of the wind power generator 100.
In one embodiment, the support arm 20 comprises a horizontal bar 2003, a first tie rod 2001 and a second tie rod 2002. The first tie rod 2001 is connected to the rotor blade 10 between the first end 15 of the rotor blade 10 and the horizontal bar 2003 and the second tie rod 2002 is connected to the rotor blade 10 between the second end 16 of the rotor blade 10 and the horizontal bar 2003.
In one embodiment the first tie rod 2001 and the second tie rod 2002 are fixedly connected to the rotor blade 10.
In one embodiment, the first tie rod 2001 and the second tie rod 2002 being a wire rope.
In one embodiment, the first tie rod 2001 and the second tie rod 2002 being a bar.
In one embodiment, the first tie rod 2001 and the second tie rod 2002 are connected to the wind turbine tower 200 in the vicinity of the support arm 20 or to the support arm 20 in the vicinity of the wind turbine tower 200.
In one embodiment, the wind turbine 100 comprises one rotor blade 10, and all wind energy of the wind turbine is provided with the one rotor blade 10.
It should be noted that the wind turbine 100 shown in figures 6a and 6b may comprises two or more rotor blades according to any embodiments shown in figure 7.
Figure 7 shows schematically a wind turbine according to one embodiment the present invention.
In one embodiment, the wind turbine 100 comprises two rotor blades 10, the two rotor blades 10 comprises a first rotor blade 1001 and a second rotor blade 1002, the axis of rotation R is arranged between the first rotor blade 1001 and the second rotor blade 1002, the leading edge 11 of first rotor blade 1001 facing in an opposite direction than the leading edge 11 of second rotor blade 1002 and all wind energy of the wind turbine is provided with the first rotor blade 1001 and with the second rotor blade 1002.
In an alternative embodiment, the wind turbine 100 comprises three or more rotor blades 10.
Figure 8a shows schematically an end view of a wind turbine according to one embodiment of the present invention.
The rotor blade 10 is positioned in a tilted position. The first end 15 of the rotor blade 10 is arranged above the second end 16 of the blade 10, the first end 15 is arranged at a second distance B from the axis of rotation R and the second end 16 is arranged at a third distance C from the axis of rotation R, and the second distance B being greater than the third distance C. The rotor blade 10 is arranged to be rotated around an axis of rotation R. The axis of rotation R being in an upright position.
In the context of this application, the rotor blade 10 is positioned in a tilted position when it has an angle between the horizontal direction in the range of 45 ° to 80 ° or in the range of 100 ° to 125°.
In one embodiment, the rotor blade 10 being curved such that the first end 15 is arranged at a second distance B from the axis of rotation R, the second end 16 is arranged at a third distance C from the axis of rotation R, the second distance B being greater than third distance C, and the first end 15 being above the second end 16 of the rotor blade 10 (not shown in figures).
In one embodiment, the rotor blade 10 being curved in relative to the vertical direction, the first end 15 is arranged at a second distance B from the axis of rotation R, the second end 16 is arranged at a third distance C from the axis of rotation R, the second distance B being greater than third distance C, and the first end 15 being above the second end 16 of the rotor blade 10 (not shown in figures).
In one embodiment, the rotor blade 10 being curved relative to the vertical direction (not shown in figures) and the first end 15 being above the second end 16 of the rotor blade 10.
In one embodiment, the rotor blade 10 being curved in the vertical direction (not shown in figures) the first end 15 being above the second end 16 of the rotor blade 10.
Figure 8b shows schematically an end view of a wind turbine according to one embodiment of the present invention.
The rotor blade 10 is positioned in a tilted position. The first end 15 of the rotor blade 10 is arranged above the second end 16 of the blade 10, the first end 15 is arranged at a second distance B from the axis of rotation R and the second end 16 is arranged at a third distance C from the axis of rotation R, and the third distance C being greater than the second distance B. The rotor blade 10 is arranged to be rotated around an axis of rotation R. The axis of rotation R being in an upright position. It should be noted that the rotor blade 10 of the embodiments shown in figures 6a, 6b and 7 may be in a tilted position as shown in figures 8a and 8b.
The invention has been described above with reference to the examples shown in the figures. However, the invention is in no way restricted to the above examples but may vary within the scope of the claims.

Claims

1 . A rotor blade for a wind turbine, the rotor blade (10) is arranged to be rotated around an axis of rotation (R), c h a r a c t e r i z e d in that:
- the rotor blade (10) having a first end (15) and a second end (16), the rotor blade (10) having a leading edge (11) extending between the first end (15) and the second end (16) of the rotor blade (10), and the leading edge (13) is arranged to lead the rotor blade (10) in a movement (M) around the axis of rotation (R) of the rotor blade (10); and
- the rotor blade (10) comprises a first winglet (13) provided to the rotor blade (10) in the first end (15) of the rotor blade (10) or in the vicinity of the first end (15) of the rotor blade (10), the first winglet (13) is arranged to protrude from the rotor blade (10) and the first winglet (13) is arranged to extend in a direction transverse to a direction between the first end (15) and the second end (16) of the rotor blade (10).
2. A rotor blade according to claim 1, c h a r a c t e r i z e d in that:
- the rotor blade (10) further comprises a second winglet (14) provided to the rotor blade (10) in the second end (16) of the rotor blade (10) or in the vicinity of the second end (16) of the rotor blade (10), the second winglet (14) is arranged to protrude from the rotor blade (10) and the second winglet (14) is arranged to extend transverse to a direction between the first end (15) and the second end (16) of the rotor blade (10); or
- the rotor blade (10) further comprises a second winglet (14) provided to the rotor blade (10) in the second end (16) of the rotor blade (10) or in the vicinity of the second end (16) of the rotor blade (10), the second winglet (14) is arranged to protrude from the leading edge (11) in a direction away from the rotor blade (10) and the second winglet (14) is arranged to extend transverse to a direction between the first end (15) and the second end (16) of the rotor blade (10)
3. A rotor blade according to claim 1 or 2, c h a r a c t e r i z e d in that:
- the rotor blade (10) having a cross-section (17), the cross-section (17) of the rotor blade (10) being transverse to a direction between the first end (15) and the second end (16) of the rotor blade (10), and the cross-section (17) of the rotor blade (10) being uniform between the first end (15) of the rotor blade (10) and the second end (16) of the rotor blade (10); or - the rotor blade 10 J having a first thickness [Wl] at the first end [15] of rotor blade [10], a second thickness [W2] at the second end [16] of rotor blade
[10] and a third thickness [W3] between the first end [15] and the second end [16] of the rotor blade [10] and the third thickness [W3] being greater than the first thickness [Wl] and greater than the second thickness [W2];or
- the rotor blade [10] having an inner surface [119] and an outer surface [19], the inner surface [119] and the outer surface [19] extending between the first end [15] and the second end [16] of the rotor blade [10], the rotor blade [10] comprises a blade wall [120] between the inner surface [119] and the outer surface [19], and the blade wall [120] comprises a stiffener [130].
4. A rotor blade according to any one of claims 1 to 3, c h a r a c t e r i z e d in that:
- the rotor blade [10] having a first surface [111], the first surface [111] facing away from the axis of rotation [R], and the first winglet [13] is arranged to protrude from the first surface [111] in a direction away from the axis of rotation [R]; or
- the rotor blade [10] having a first surface [111], the first surface [111] facing away from the axis of rotation [R], and the first winglet [13] and the second winglet [14] are arranged to protrude in a direction from the axis of rotation [R]; or
- the rotor blade [10] having a leading surface [18] facing towards a direction of the movement [M], and the first winglet [13] is arranged to protrude from the leading surface [18]; or
- the rotor blade [10] having a leading surface [18] facing towards a direction of the movement [M], and the first winglet [13] and the second winglet
[14] are arranged to protrude from the leading surface [18].
5. A rotor blade according to any one of claims 1 to 4, c h a r a c t e r i z e d in that:
- the first winglet [13] is arranged to protrude from the leading edge
[11] in a direction away from the rotor blade [10] and the first winglet [13] is arranged to extend in a direction transverse to a direction between the first end
[15] and the second end [16] of the rotor blade [10]; or
- the rotor blade [10] having a trailing edge [12] opposite to the leading edge [11], the first winglet [13] is arranged to protrude from the leading edge [11] in a direction away from the trailing edge (12), and the first winglet (13) is arranged to extend in a direction transverse to a direction between the first end (15) and the second end (16) of the rotor blade (10); or
- the rotor blade (10) having an outer surface (19), the outer surface facing (19) away from the rotor blade (10), and the first winglet (13) is arranged to protrude from the outer surface of the rotor blade (10) in a direction away from the rotor blade (10); or
- the rotor blade (10) having an outer surface (19), the outer surface facing (19) away from the rotor blade (10), the first winglet (13) and the second winglet (14) are arranged to protrude from the outer surface (19) of the rotor blade (10) in a direction away from the rotor blade (10); or
- the rotor blade (10) having a first surface (111) and a second surface (112), the second surface (112) facing towards the axis of rotation (R), the first surface (111) facing away from the axis of rotation (R), and the first winglet (13) is arranged to protrude in a direction away from the first surface (111) of the rotor blade (10) and in a direction away from the second surface (112) of the rotor blade
(10); or
- the rotor blade (10) having a first surface (111) and a second surface (112), the second surface (112) facing towards the axis of rotation (R), the first surface (111) facing away from the axis of rotation (R), and the first winglet (13) and the second winglet (14) are arranged to protrude in a direction away from the first surface (111) of the rotor blade (10) and in a direction away from the second surface (112) of the rotor blade (10).
6. A rotor blade according to any one of claims 1 to 5, c h a r a c t e r i z e d in that:
- the rotor blade (10) having a trailing edge (12) opposite to the leading edge (11), and the first winglet (13) is arranged to taper towards the trailing edge
(11); or
- the rotor blade (10) having a trailing edge (12) opposite to the leading edge (11), and the first winglet (13) and the second winglet (14) are arranged to taper towards the trailing edge (12); or
- the first winglet (13) is arranged to protrude at a first distance (A) from the rotor blade (10); or
- the first winglet (13) comprises an outer edge (131), the outer edge
Figure imgf000028_0001
rotor blade (10) at a distance from the outer surface (19); or the first winglet (13) comprises an outer edge (131), the outer edge (131) of the first winglet (13) is arranged to surround the outer surface (19) of the rotor blade (10) at a first distance (A) from the outer surface (19), and the first distance (A) being uniform; or
- the first winglet (13) comprises an outer edge (131), the outer edge (131) of the first winglet (13) is arranged to surround the outer surface (19) of the rotor blade (10) at a distance from the outer surface (19), and the second winglet (14) being identical to the first winglet (13); or
-the first winglet (13) comprises an outer edge (131), the outer edge (131) of the first winglet (13) is arranged to surround the outer surface (19) of the rotor blade (10) at a first distance (A) from the outer surface (19); and the second winglet (14) being identical to the first winglet (13). or
- the second winglet (14) being identical to the first winglet (13).
7. A rotor blade according to any one of claims 1 to 6, c h a r a c t e r i z e d in that:
- the rotor blade (10) comprises a support arm (20), the support arm (20) is provided to the rotor blade (10) between the first end (15) and the second end (16) of the rotor blade (10); or
- the rotor blade (10) comprises a support arm (20), the support arm (20) is provided to the rotor blade (10) between the first end (15) and the second end (16) of the rotor blade (10), and the support arm (20) is arranged to protrude from the second surface (112) of rotor blade (10) in direction away from the rotor blade (10); or
- the rotor blade (10) comprises a support arm (20), the support arm (20) is provided to the rotor blade (10) between the first end (15) and the second end (16) of the rotor blade (10), the support arm (20) is arranged to protrude from the second surface (112) of the rotor blade (10) in direction away from the rotor blade (10) and the support arm (20) is arranged to transfer rotational power of the rotor blade (10).
8. A rotor blade according to any one of claims 1 to 7, c h a r a c t e r i z e d in that:
- the axis of rotation (R) is arranged to be to extend parallel to a direction between a first end (15) and the second end (16) of the rotor blade (10); or
- the axis of rotation (R) is arranged to extend in a direction parallel to a direction between a first end (15) and the second end (16) of the rotor blade (10) and the support arm (20) is provided between the second surface (112) of the rotor blade (10) and the axis of rotation (R).
9. A rotor blade according to any one of claims 1 to 8, c h a r a c t e r i z e d in that:
- the rotor blade (10) comprises a first surface (111), and the first surface (111) of the rotor blade (10) comprises a convex portion; or
- the rotor blade (10) comprises a first surface (111) and a second surface (112), and the first surface (111) of the rotor blade (10) being identical to the second surface (112) of the rotor blade (10).
10. A rotor blade according to any one of claims 1 to 9, c h a r a c t e r i z e d in that:
- the rotor blade (10) comprises a second surface (112) facing towards the axis of rotation (R), and the second surface (112) of the rotor blade (10) comprises a flat portion; or
- the rotor blade (10) comprises a second surface (112) facing towards the axis of rotation (R), and the second surface (112) of the rotor blade (10) comprises a convex portion; or
- the rotor blade (10) comprises a second surface (112) facing towards the axis of rotation (R), the second surface (112) of the rotor blade (10) comprises a convex portion, the rotor blade (10) comprises a first surface (111) facing away from the axis of rotation (R), the rotor blade (10) having a chord line (113), the chord line (113) extends from the leading edge (11) to the trailing edge (12), the chord line (113) being a straight line, the rotor blade (10) having a mean camber line (114), the mean camber line (114) being equidistant from the first surface (111) and the second surface (112) of the rotor blade (10), and the mean camber line (114) is provided between the chord line (113) and the first surface (111); or
- the rotor blade (10) comprises a second surface (112), the second surface (112) is facing towards the axis of rotation (R) the second surface (112) of the rotor blade (10) comprises a convex portion, the rotor blade (10) comprises a first surface (111), the second surface (112) being identical to the first surface (111); or - the rotor blade flOj comprises a second surface 112 ), the second surface [112] is facing towards the axis of rotation [R), and the second surface [112) of the rotor blade [10] comprises a concave portion; or
- the rotor blade [10] comprises a first surface [111] and a second surface [112), and the first surface [111) and the second surface [112) comprise a form of a helix between the first end [15) and second end [16) of the rotor blade Cio).
11. A rotor blade according to any one of claims 1 to 10, c h a r a c t e r i z e d in that:
- the first winglet [13) is fixedly connected to or integrated to the rotor blade [10); or
- the first winglet [13) and the second winglet [14) are fixedly connected to or integrated to the rotor blade [10); or
- the support arm [20) is fixedly connected to or integrated to the rotor blade [10) between the first end [15) and the second end [16) of the rotor blade [10); or
- the first winglet [13) is fixedly connected to or integrated to the rotor blade [10) and the support arm [20) is fixedly connected to or integrated to the rotor blade [10) between the first end [15) and the second end [16) of the rotor blade [10); or
- the first winglet [13) and the second winglet [14) are fixedly connected to or integrated to the rotor blade [10) and the support arm [20) is fixedly connected to or integrated to the rotor blade [10) between the first end [15) and the second end [16) of the rotor blade [10).
12. A wind turbine, c h a r a c t e r i z e d in that:
- the wind turbine [100) comprises a rotor blade [10),
- the rotor blade [10) comprises a first winglet [13) provided to the rotor blade [10) in the vicinity of the first end [15) of the rotor blade [10) or in the first end [15) of the rotor blade [10),
- the rotor blade is arranged to be rotated around an axis of rotation [R) and
- the axis of rotation [R) being in an upright position.
13. A wind turbine according to claim 12, c h a r a c t e r i z e d in that: - the rotor blade 10 J having a longitudinal direction (L) between the first end [15] and the second end (16) of the rotor blade (10), and the longitudinal direction (L) of the rotor blade (10) is positioned in an upright position; or
- the rotor blade (10) having a longitudinal direction (L) between the first end (15) and the second end (16) of the rotor blade (10), and the longitudinal direction (L) of the rotor blade (10) is positioned in an upright position, the rotor blade (10) having a first surface (111) and a second surface (112), the second surface (112) facing towards the axis of rotation (R), the first surface (111) facing away from the axis of rotation (R), the second surface (112) of the rotor blade (10) is positioned at a sixth distance (D) from the axis of rotation (R), and longitudinal direction (L) of the rotor blade (10) being parallel to the axis of rotation (R); or
- the rotor blade (10) is positioned in a tilted position; or
- the rotor blade (10) is positioned in a tilted position, the first end (15) of the rotor blade (10) is arranged above the second end (16) of the blade (10), the first end (15) is arranged at a second distance (B) from the axis of rotation (R) and the second end (16) is arranged at a third distance (C) from the axis of rotation (R), and the second distance (B) being greater than the third distance (C); or
- the rotor blade (10) is positioned in a tilted position, the first end (15) of the rotor blade (10) is arranged above the second end (16) of the blade (10), the first end (15) is arranged at a second distance (B) from the axis of rotation (R) and the second (16) is arranged at a third distance (C) from the axis of rotation (R), and the third distance (C) being greater than the second distance (B).
14. A wind turbine according to claim 12 or 13, c h a r a c t e r i z e d in that:
- the wind turbine (100) comprises one rotor blade (10), and all wind energy of the wind turbine (100) is provided with the one rotor blade (10); or
- the wind turbine (100) comprises two rotor blades (10), the two rotor blades (10) comprises a first rotor blade (1001) and a second rotor blade (1002), the axis of rotation (R) is arranged between the first rotor blade (1001) and the second rotor blade (1002), the leading edge (11) of first rotor blade (1001) facing in an opposite direction than the leading edge (11) of second rotor blade (1002) and all wind energy of the wind turbine (100) is provided with the first rotor blade (1001) and with the second rotor blade (1002);or
- the wind turbine (100) comprises three or more rotor blades (10). 15. A wind turbine according to any one of claims 12 to 14, characterized in that:
- a rotor blade (10) being a rotor blade (10) according to any one of claims Ito 11.
PCT/FI2022/050712 2021-11-02 2022-11-01 A rotor blade and a wind turbine WO2023079210A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160177915A1 (en) * 2014-12-22 2016-06-23 Siemens Aktiengesellschaft Rotor blade extension
WO2017156135A1 (en) * 2016-03-08 2017-09-14 Ignacio Juarez Vertical axis wind turbine
EP3066339B1 (en) * 2013-05-22 2020-07-08 Ryse Energy Holdings Limited Vertical axis wind turbine
US20210095637A1 (en) * 2018-05-29 2021-04-01 Ntn Corporation Vertical axis wind turbine, and wind power generating device and lighting facility comprising same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3066339B1 (en) * 2013-05-22 2020-07-08 Ryse Energy Holdings Limited Vertical axis wind turbine
US20160177915A1 (en) * 2014-12-22 2016-06-23 Siemens Aktiengesellschaft Rotor blade extension
WO2017156135A1 (en) * 2016-03-08 2017-09-14 Ignacio Juarez Vertical axis wind turbine
US20210095637A1 (en) * 2018-05-29 2021-04-01 Ntn Corporation Vertical axis wind turbine, and wind power generating device and lighting facility comprising same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHONG WEN, GWANI MOHAMMED, TAN CHIN, MUZAMMIL WAN, POH SIN, WONG KOK: "Design and Testing of a Novel Building Integrated Cross Axis Wind Turbine", APPLIED SCIENCES, vol. 7, no. 3, pages 251, XP093065334, DOI: 10.3390/app7030251 *

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