IES86162B2 - Aerofoil blades - Google Patents

Aerofoil blades

Info

Publication number
IES86162B2
IES86162B2 IES20120347A IES20120347A IES86162B2 IE S86162 B2 IES86162 B2 IE S86162B2 IE S20120347 A IES20120347 A IE S20120347A IE S20120347 A IES20120347 A IE S20120347A IE S86162 B2 IES86162 B2 IE S86162B2
Authority
IE
Ireland
Prior art keywords
blade
dimples
aerofoil
leading edge
area
Prior art date
Application number
IES20120347A
Inventor
James Smyth
Peter Smyth
David Smyth
Gerard Smyth
Andrew Smyth
Original Assignee
New World Energy Entpr Ltd
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 New World Energy Entpr Ltd filed Critical New World Energy Entpr Ltd
Priority to IES20120347A priority Critical patent/IES86162B2/en
Publication of IES20120347A2 publication Critical patent/IES20120347A2/en
Publication of IES86162B2 publication Critical patent/IES86162B2/en
Priority to US13/897,766 priority patent/US20140044552A1/en
Priority to PCT/EP2013/066495 priority patent/WO2014023739A1/en
Priority to IES20130233A priority patent/IES86367B2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • F01D5/145—Means for influencing boundary layers or secondary circulations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • 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
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/32—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor with roughened surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/20—Geometry three-dimensional
    • F05B2250/28—Geometry three-dimensional patterned
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/60—Structure; Surface texture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Wind Motors (AREA)

Abstract

An aerofoil blade such as a wind turbine blade 10 has a plurality of dimples 18 distributed over an area of the upper surface of the blade which extends from immediately adjacent to the leading edge 12 of the blade at least partially towards the rear edge 14 of the blade. <Figure 1>

Description

Field of the Invention The present invention is concerned with aerofoil blades (i.e. blades having an aerofoil cross-section), for example as used in wind turbines or the like, and in particular blades having improved flow characteristics, for example reduced boundary layer separation, reduced turbulence, etc.
Background of the invention Aerofoil blades are used in a large number of applications, and in many of those applications it is 15 desirable to improve the efficiency and/or performance of the blade through various means. In one application aerofoil blades are utilised in augmented wind turbine systems, for example comprising a shroud surrounding a set of aerofoil blades such as to take advantage of the higher velocity profile. By improving the performance and/or efficiency of such blades a greater power output can be achieved and/or the turbines can be located in a more diverse range of locations. It will also be appreciated that the invention can also be used in conventional wind turbine systems or other rotational blade applications.
Summary of the invention 25 According to the invention there is provided an aerofoil blade having a plurality of dimples distributed over an area of the upper surface of the blade which extends from immediately adjacent to the leading edge of the blade at least partially towards the rear edge of the blade.
Preferably, the area of dimples extends along at least a major part of the length of the leading edge of the blade.
Preferably, the dimples are generally teardrop-shaped with their wider ends facing towards the leading edge of the blade.
Preferably, the dimples vary in distribution density.
Preferably, the dimples vary in depth.
Preferably, the trailing edge of the blade has a localised rearward extension.
Preferably, the localised rearward extension is at the free end of the blade.
Preferably, the blade is a wind turbine blade.
Preferably, dimples are also provided on the lower surface of the blade.
Brief description of the drawings Embodiments of the invention will now be described, byway of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of an embodiment of wind turbine blade according to the invention.
Figure 2 is a schematic partial cross section through the blade of Figure 1.
Figure 3 is a partial top view of the blade of Figure 1.
Figure 4 is a perspective view of a modification of the wind turbine blade of Figure 1.
Detailed description of the drawings Referring to Figures 1 to 3, a wind turbine blade with an aerofoil cross-section comprises an outwardly tapered blade 10 with a leading edge 12, a trailing edge 14 and an outer free end 16. A large number of dimples 18 are distributed over the upper surface 20 of the blade. In this embodiment the dimples 18 extend fully from the leading edge 12 of the blade to the trailing edge 14, i.e. they cover substantially the entire upper surface 20. In general, however, the dimpled area of the upper surface 12 may extend rearwardly from immediately adjacent to the leading edge 12 of the blade only partially to the trailing edge 14, preferably at least one quarter the way to the trailing edge.
Also, the dimpled area does not necessarily need to extend along the full length of the leading edge 12 of the blade, although it preferably extends along at least a major part of the length of the leading edge.
In this embodiment the dimples 18 are generally concave teardrop-shaped depressions aligned with their wider ends facing towards the leading edge 12 of the blade, as shown in Figure 3. The dimples 18 are preferably closely spaced, but their distribution density may vary over the dimpled area. The dimples may also vary in depth.
The dimples 18 can be created directly in the upper surface 20 of the blade, or by using blade protection tape 22 (Figure 2) which is embossed with the teardrop shaped dimples and applied to the upper surface 20.
In the embodiment shown in Figures 1 to 3 the length of the blade 10 was 2.45m with an average chord of 300mm. The dimples are 15mm long by 9mm wide at their widest part, with a maximum depth of 0.33mm.
The above turbine blade design serves to accelerate airflow, increase lift and reduce the wake created by the blade. The dimples serve to create a micro-turbulent layer across the blade which in turn causes the wind-force acting on the blade to be greater. The dimples delay boundary layer separation thereby reducing the wake of the blade. The dimples, when in an inverted teardrop shape, may also act as mini-augmenters and give the air direction. The depth, size, shape and distribution density of the dimples may vary with blade characteristics.
In a modification of the above embodiment, Figure 4, the trailing edge 14 of the blade 10 has a localised rearward paddle-like extension 24, preferably at its free end 16, The extended paddle-like tip 24 of the blade serves to increase the surface area. However the dimples can still work effectively on a conventional aerofoil blade which does not have the projection, i.e. as shown in Figure 1. if desired, similar dimples may be provided on the lower surface of the blade (not shown), again extending rearwardly from the leading edge.
The invention is not limited to the embodiments described herein which may be modified or varied without departing from the scope of the invention.

Claims (5)

Claims
1. An aerofoil blade having a plurality of dimples distributed over an area of the upper surface of the blade which extends from immediately adjacent to the leading edge of the blade at least 5 partially towards the rear edge of the blade.
2. An aerofoil blade as claimed in claim 1, wherein the area of dimples extends along at least a major part of the length of the leading edge of the blade. 10
3. An aerofoil blade as claimed in claim 1 or 2, wherein the dimples are generally teardropshaped with their wider ends facing towards the leading edge of the blade.
4. An aerofoil blade as claimed in claim 1, 2 or 3, wherein the dimples vary in distribution density.
5. An aerofoil blade as claimed in claim 1,2 or 3, wherein the dimples vary in depth.
IES20120347A 2012-08-09 2012-08-09 Aerofoil blades IES86162B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IES20120347A IES86162B2 (en) 2012-08-09 2012-08-09 Aerofoil blades
US13/897,766 US20140044552A1 (en) 2012-08-09 2013-05-20 Blade for a rotary machine
PCT/EP2013/066495 WO2014023739A1 (en) 2012-08-09 2013-08-06 A blade for a rotary machine
IES20130233A IES86367B2 (en) 2012-08-09 2013-08-07 A blade for a rotary machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IES20120347A IES86162B2 (en) 2012-08-09 2012-08-09 Aerofoil blades

Publications (2)

Publication Number Publication Date
IES20120347A2 IES20120347A2 (en) 2013-03-27
IES86162B2 true IES86162B2 (en) 2013-03-27

Family

ID=47901525

Family Applications (2)

Application Number Title Priority Date Filing Date
IES20120347A IES86162B2 (en) 2012-08-09 2012-08-09 Aerofoil blades
IES20130233A IES86367B2 (en) 2012-08-09 2013-08-07 A blade for a rotary machine

Family Applications After (1)

Application Number Title Priority Date Filing Date
IES20130233A IES86367B2 (en) 2012-08-09 2013-08-07 A blade for a rotary machine

Country Status (3)

Country Link
US (1) US20140044552A1 (en)
IE (2) IES86162B2 (en)
WO (1) WO2014023739A1 (en)

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WO2010104083A1 (en) * 2009-03-10 2010-09-16 ダイキン工業株式会社 Crossflow fan and air conditioner provided with same
EP3354904B1 (en) 2015-04-08 2020-09-16 Horton, Inc. Fan blade surface features
NL1041491B1 (en) * 2015-09-25 2017-04-19 Home Turbine B V Device for converting wind energy into at least mechanical energy.
WO2017052371A1 (en) * 2015-09-21 2017-03-30 Home Turbine B.V. Device for converting wind energy into at least mechanical energy
GB2556110B (en) * 2016-11-21 2020-04-01 Dyson Technology Ltd Compressor blade surface patterning
DK3399182T3 (en) 2017-05-05 2021-02-15 Nordex Energy Se & Co Kg TIP FOR ROTOR BLADES WITH LOW NOISE
CN115750196B (en) * 2022-11-17 2024-03-12 中材科技风电叶片股份有限公司 Wind power blade and wind power generator

Family Cites Families (16)

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US3463418A (en) * 1968-03-20 1969-08-26 Edmond S Miksch Vortex generator for airplane wing
US4872484A (en) * 1988-12-12 1989-10-10 John Hickey System for controlling the flow of a fluid medium relative to an object
US5075564A (en) * 1989-12-19 1991-12-24 Hickey John J Combined solar and wind powered generator with spiral surface pattern
US4974633A (en) * 1989-12-19 1990-12-04 Hickey John J System for controlling the flow of a fluid medium relative to an object
US5254876A (en) * 1992-05-28 1993-10-19 Hickey John J Combined solar and wind powered generator with spiral blades
US5386146A (en) * 1993-04-22 1995-01-31 Hickey; John J. In-line auger driven charging system
US5634613A (en) * 1994-07-18 1997-06-03 Mccarthy; Peter T. Tip vortex generation technology for creating a lift enhancing and drag reducing upwash effect
DE10301080A1 (en) * 2002-10-22 2004-05-13 Siemens Ag Wind turbine
EP1469198A1 (en) * 2003-04-17 2004-10-20 Eugen Radtke Wind energy converter with lift improving surface structure.
US20060110257A1 (en) * 2004-11-23 2006-05-25 Yu-Keng Huang Ceiling fan blade
US7604461B2 (en) * 2005-11-17 2009-10-20 General Electric Company Rotor blade for a wind turbine having aerodynamic feature elements
US8033794B2 (en) * 2009-05-26 2011-10-11 Jia-Yuan Lee Wind turbine
EP2258941A1 (en) * 2009-06-05 2010-12-08 Jia-Yuan Lee Wind turbine
GR1008803B (en) * 2010-09-01 2016-07-01 Εμμανουηλ Δημητριου Μιχαλης Wind generator's blades
US20120103430A1 (en) * 2010-10-27 2012-05-03 Zuei-Ling Lin Method of reducing the object-traveling resistance
US8864440B2 (en) * 2010-11-15 2014-10-21 Sauer Energy, Incc. Wind sail turbine

Also Published As

Publication number Publication date
IES20120347A2 (en) 2013-03-27
IES20130233A2 (en) 2014-03-26
WO2014023739A1 (en) 2014-02-13
US20140044552A1 (en) 2014-02-13
IES86367B2 (en) 2014-03-26

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