CN114576082B - Wind power generation device - Google Patents

Wind power generation device Download PDF

Info

Publication number
CN114576082B
CN114576082B CN202210273330.2A CN202210273330A CN114576082B CN 114576082 B CN114576082 B CN 114576082B CN 202210273330 A CN202210273330 A CN 202210273330A CN 114576082 B CN114576082 B CN 114576082B
Authority
CN
China
Prior art keywords
span
blade
wind wheel
section
chord length
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
CN202210273330.2A
Other languages
Chinese (zh)
Other versions
CN114576082A (en
Inventor
郭小江
李新凯
唐巍
叶昭良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaneng Clean Energy Research Institute
Original Assignee
Huaneng Clean Energy Research Institute
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 Huaneng Clean Energy Research Institute filed Critical Huaneng Clean Energy Research Institute
Priority to CN202210273330.2A priority Critical patent/CN114576082B/en
Publication of CN114576082A publication Critical patent/CN114576082A/en
Application granted granted Critical
Publication of CN114576082B publication Critical patent/CN114576082B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/02—Wind motors with rotation axis substantially parallel to the air flow entering the rotor  having a plurality of rotors
    • F03D1/025—Wind motors with rotation axis substantially parallel to the air flow entering the rotor  having a plurality of rotors coaxially arranged
    • 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
    • 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
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • 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
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)

Abstract

The invention provides a wind power generation device, which comprises a wind wheel mechanism and a double-shaft generator; the wind wheel mechanism comprises a front wind wheel (100) and a rear wind wheel (200); the two ends of the double-shaft generator are respectively provided with a first rotor and a second rotor, the front wind wheel (100) is connected with the first rotor through a first rotating shaft, and the rear wind wheel (200) is connected with the second rotor through a second rotating shaft; the front wind wheel (100) comprises a plurality of front blades (101); the front blade (101) comprises an inner section blade span, a middle section blade span and an outer section blade span which are sequentially connected, and the maximum chord length of the middle section blade span is smaller than that of the outer section blade span so as to be capable of guiding fluid to the rear wind wheel (200). The wind power generation device has the advantages of high power generation efficiency, compact arrangement and land saving.

Description

Wind power generation device
Technical Field
The invention relates to the technical field of wind power generation, in particular to a wind power generation device.
Background
Wind is one of pollution-free energy sources, and is inexhaustible. The wind power generation device is very suitable for coastal islands, grassland pasture areas, mountain areas and plateau areas which are lack of water, fuel and inconvenient in transportation by utilizing wind power according to local conditions. In addition, offshore wind power is also an important field of renewable energy development, is an important force for promoting the progress of wind power technology and the industrial upgrading, and is an important measure for promoting the adjustment of energy structure.
The wind energy resources in China are rich, the wind energy reserves which can be developed and utilized are about 10 hundred million kW, wherein the land wind energy reserves are about 2.53 hundred million kW (calculated by the height data of the land and 10m away from the land), and the offshore wind energy reserves which can be developed and utilized are about 7.5 hundred million kW, and the total of the wind energy reserves is 10 hundred million kW.
The wind power generation device is power equipment for converting wind energy into mechanical work, wherein the mechanical work drives a rotor to rotate, and finally, alternating current is output. The wind power generation device generally comprises a wind wheel, a generator, a direction regulator, a tower, a speed limiting safety mechanism, an energy storage device and the like.
Although the wind power generation device in the prior art has the advantages of cleanness, good environmental benefit, reproducibility, short construction period, flexible installation scale and the like, the existing wind power generation device also has the problems of low power generation efficiency, wide occupied area and instability.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, the embodiment of the invention proposes a wind power generation device which has the advantages of high power generation efficiency, compact arrangement and land saving.
According to the wind power generation device provided by the embodiment of the invention, the wind power generation device comprises a wind wheel mechanism and a double-shaft generator; the wind wheel mechanism comprises a front wind wheel and a rear wind wheel; the two ends of the double-shaft generator are respectively provided with a first rotor and a second rotor, the front wind wheel is connected with the first rotor through a first rotating shaft, and the rear wind wheel is connected with the second rotor through a second rotating shaft; the front wind wheel comprises a plurality of front blades; the front blade comprises an inner section blade span, a middle section blade span and an outer section blade span which are sequentially connected, and the maximum chord length of the middle section blade span is smaller than that of the outer section blade span so as to guide fluid to flow to the rear wind wheel.
According to the wind power generation device provided by the embodiment of the invention, the maximum chord length of the middle section blade span is smaller than the maximum chord length of the outer section blade span, so that when the airflow flows through the front wind wheel, the airflow which is not blocked by the front blades can continue to flow to the rear wind wheel, and the kinetic energy loss of the airflow is smaller, so that the rear wind wheel can be effectively driven to rotate, the rotation speed of the rear wind wheel is improved, and the overall power generation efficiency of the wind wheel assembly is improved.
Optionally, the front blade is configured to: the maximum chord length of the middle section leaf span is smaller than the minimum chord length of the inner section leaf span.
Optionally, the rear wind wheel comprises a plurality of rear blades, and the minimum chord length of the middle section span of the rear blades is larger than the maximum chord length of the middle section span of the front blades.
Optionally, the front blade is configured to: the minimum chord length of the inner Duan Shezhan is greater than the maximum chord length of the outer span, and smooth curve transitions are provided between the inner span, the middle span and the outer span.
Optionally, the rear blade is configured to: the minimum chord length of the inner section leaf span is respectively larger than the maximum chord lengths of the middle section leaf span and the outer section leaf span, and smooth curve transition is formed among the inner section leaf span, the middle section leaf span and the outer section leaf span.
Optionally, the ratio of the span lengths of the inner section span, the middle section span and the outer section span ranges from 1:1:1 to 1:1:1.3.
optionally, the maximum chord length of the inner span of the front blade is 1/5 to 2/5 of the overall span of the blade.
Optionally, the maximum chord length of the inner span of the rear blade is 1/10 to 3/10 of the overall span of the blade.
Optionally, the thickness of the front blade gradually decreases along the direction from the inner section blade span to the outer section blade span; and/or, the thickness of the rear blade gradually decreases along the direction from the inner section blade span to the outer section blade span.
Optionally, the position of the inner span of the leading blade with a relative thickness D/L of 50% is 15% to 17% from the blade root, the position of the inner span of the leading blade with a relative thickness D/L of 40% is 19% to 21% from the blade root, and the position of the inner span of the leading blade with a relative thickness D/L of 35% is 23% to 25% from the blade root, wherein D is the thickness of the blade and L is the chord length of the blade.
Optionally, the position of the outer span of the leading blade with a relative thickness D/L of 25% is 52% to 54% from the blade root, the position of the outer span of the leading blade with a relative thickness D/L of 21% is 66% to 72% from the blade root, and the position of the outer span of the leading blade with a relative thickness D/L of 15% is at the tip of the blade.
Optionally, the trailing blade has a span length of 60% to 80% of the span length of the leading blade.
Through the technical scheme, because the wind wheel mechanism of the wind power generation device comprises the front wind wheel and the rear wind wheel which are coaxially arranged, the front wind wheel and the rear wind wheel can be simultaneously driven by wind power to rotate, when the front wind wheel rotates, the front wind wheel is driven to be connected with the front wind wheel to rotate, the first rotor in the double-shaft generator is driven to rotate for generating electricity, when the rear wind wheel rotates, the rear wind wheel is driven to be connected with the second rotor to rotate, and the second rotor in the double-shaft generator is driven to rotate for generating electricity, so that when the front wind wheel and the rear wind wheel simultaneously rotate, the first rotor and the second rotor of the double-shaft generator simultaneously rotate for generating electricity, the generating energy is improved, and because the front wind wheel and the rear wind wheel can be jointly arranged on a strut of the same wind power generation device, the quantity of the wind power generation device can be greatly reduced, and the area required for wind power generation is reduced.
In one embodiment, the front blade is arranged to: the maximum chord length of the middle section blade span is smaller than the maximum chord length of the outer section blade span to enable the fluid to be directed towards the rear wind wheel. Therefore, when the air flow flows from the middle-section blade span of the front blade, the air flow which is not blocked by the middle-section blade span of the front blade can continue to flow towards the rear wind wheel, and the kinetic energy loss of the air flow is smaller, so that the rear wind wheel can be effectively driven to rotate, the rotation speed of the rear wind wheel is improved, and the overall power generation efficiency of the wind wheel assembly is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a perspective view of a wind power plant according to an embodiment of the invention;
FIG. 2 is a schematic view of an embodiment of a front wind wheel of a wind power plant of the present invention;
fig. 3 is a schematic view of an embodiment of a rear wind rotor of a wind power plant according to the invention.
Reference numerals:
100-front wind wheel, 101-front blade, 200-rear wind wheel, 201-rear blade,
thickness of D-blade, elongation of L-blade.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1 to 3, the wind power generation device of the present invention includes a wind wheel mechanism and a biaxial generator; the wind wheel mechanism comprises a front wind wheel 100 and a rear wind wheel 200; the two ends of the double-shaft generator are respectively provided with a first rotor and a second rotor, the front wind wheel 100 is connected with the first rotor through a first rotating shaft, and the rear wind wheel 200 is connected with the second rotor through a second rotating shaft; the front wind wheel 100 comprises a plurality of front blades 101; wherein, the front blade 101 includes an inner section span, a middle section span and an outer section span connected in sequence, and the maximum chord length of the middle section span is smaller than the maximum chord length of the outer section span to be able to guide the fluid to the rear wind wheel 200.
In one embodiment, since the wind wheel assembly includes the front wind wheel 100 and the rear wind wheel 200 coaxially disposed, the front wind wheel 100 and the rear wind wheel 200 can be simultaneously driven to rotate by wind force, when the front wind wheel 100 rotates, the front wind wheel 100 is driven to rotate by being connected with the first rotating shaft to drive the first rotor of the dual-shaft generator to rotate for generating electricity, when the rear wind wheel 200 rotates, the rear wind wheel 200 is driven to rotate by being connected with the second rotating shaft to drive the second rotor of the dual-shaft generator to rotate for generating electricity, therefore, when the front wind wheel 100 and the rear wind wheel 200 rotate simultaneously, the first rotor and the second rotor of the dual-shaft generator rotate simultaneously for generating electricity, thereby improving the generating capacity, and since the front wind wheel 100 and the rear wind wheel 200 can be jointly disposed on the same strut of the wind power generation device, the number of wind power generation devices can be greatly reduced, and the area required for wind power generation can be reduced.
In one embodiment, the front blade 101 is configured to: the maximum chord length of the mid-section span is less than the maximum chord length of the outer-section span to enable the flow of fluid to the rear wind rotor 200. That is, when the airflow flows from the front wind wheel 100, the airflow not blocked by the front blades 101 can continue to flow to the rear wind wheel 200, and the kinetic energy loss of the airflow is small, so that the rear wind wheel 200 can be effectively driven to rotate, the rotation speed of the rear wind wheel 200 is increased, and the overall power generation efficiency of the wind wheel assembly is improved.
It should be understood that the leading blade 101 may be designed in a variety of ways as long as the chord length of the midsection span of the leading blade 101 is less than the chord length of the outer section span.
In some embodiments, the maximum chord length of the inner span of the front blade 101 may be set to be the minimum, that is, the minimum chord length of the middle span is greater than the maximum chord length of the inner span, so that the front blade 101 is in a shape in which the chord length gradually decreases from the outer span to the inner span as a whole, and the blade of this shape may also allow more airflow through the middle span portion because the chord length of the middle span is smaller than the outer span, thereby increasing the rotational speed of the rear wind wheel 200. However, due to the smaller chord length of the inner section Duan Shezhan, the mechanical strength of the inner section span is lower, which may cause problems in bending or even breaking the blade from the root.
In other embodiments, the chord length of the inner portion Duan Shezhan of the front blade 101 may be set to be the same as the chord length of the middle portion span, so that the front blade 101 is in a shape with a large outer portion span and a small middle portion span as a whole, and the blade with such a shape can also allow more airflow through the middle portion span portion because the chord length of the middle portion span is smaller than the outer portion span, thereby increasing the rotational speed of the rear wind wheel 200. However, the chord length of the inner span of the blade in this shape is still small, resulting in lower mechanical strength at the inner span, which may cause problems of bending or even breaking the blade from the root.
Therefore, in order to solve the above-described problems, in a preferred embodiment of the present invention, the front blade 101 is provided with: the maximum chord length of the middle leaf span is smaller than the minimum chord length of the inner leaf span. That is, the blade of this shape is in a wave-like shape having a large outer-section span, a small middle-section span and a large inner-section span as a whole, and since the maximum chord length of the middle-section span is smaller than that of the outer-section span, it is also possible to allow more airflow to pass through the middle-section span portion, thereby improving the rotational speed of the rear wind wheel 200, and since the maximum chord length of the inner-section span is large, the mechanical strength of the inner-section span is ensured, and the problem that the blade is bent from the root or even broken is fundamentally solved.
On the other hand, another benefit of the outer span of the leading blade 101 having a maximum chord length that is greater than the maximum chord length of the middle span is: because the chord length of the outer section blade span is larger, the outer section blade span of the front blade 101 can contact more airflow, and the moment arm from the outer section blade span to the first rotating shaft is longer than the moment arm from the middle section blade span to the first rotating shaft, so that the moment at the outer section blade span is larger, the moment can enable an object to obtain angular acceleration, the moment of momentum of the object can be changed, and the larger the moment is for the same object, the easier the rotating state is to be changed, therefore, the arrangement mode can enable the front wind wheel 100 to rotate more easily, and the rotating speed of the front wind wheel 100 can be further improved.
The rotational speed of the front wind wheel 100 is prioritized because the front wind wheel 100 is first contacted with the air flow, and the kinetic energy of the converted air flow can be maximized, thereby effectively utilizing the wind power.
Further, the rear wind wheel 200 includes a plurality of rear blades 201, and the minimum chord length of the middle span of the rear blades 201 is greater than the maximum chord length of the middle span of the front blades 101. This arrangement enables the airflow flowing from the front blade 101 to the rear blade 201 to more fully contact the midspan of the rear blade 201, thereby driving the rear blade 201 to increase the rotational speed.
Further, in one embodiment of the present invention, the front blade 101 is provided as: the minimum chord length of the inner section leaf span is larger than the maximum chord length of the outer section leaf span, and smooth curve transition is formed among the inner section leaf span, the middle section leaf span and the outer section leaf span. The advantages of this arrangement are: first, the front blade 101 has a shape of maximum chord length of the inner span, that is, the mechanical strength of the root of the front blade 101 is maximally improved, so that the problem of bending or even breaking of the blade from the root can be completely avoided. Second, the smooth curve transition between the inner section span, the middle section span and the outer section span of the front blade 101 makes the whole blade streamline, and effectively reduces the resistance when the blade rotates, thereby ensuring the rotation speed of the front wind wheel 100.
On the other hand, the trailing blade 201 may also be provided with: the minimum chord length of the inner section leaf span is respectively larger than the maximum chord lengths of the middle section leaf span and the outer section leaf span, and smooth curve transition is formed among the inner section leaf span, the middle section leaf span and the outer section leaf span. Also, with the above arrangement, the mechanical strength of the root portion of the trailing blade 201 is maximally improved, so that the problem of bending or even breaking of the blade from the root portion can be completely avoided. Second, the smooth curve transition between the inner span, the middle span and the outer span of the rear blade 201 makes the entire blade streamline, and effectively reduces the resistance when the blade rotates, thereby ensuring the rotational speed of the rear wind wheel 200.
Because the outer section of the blade is in contact with more air flow, the moment is larger, so that the front wind wheel 100 is easier to rotate, and the rotating speed of the front wind wheel 100 can be further improved. Thus, in one embodiment of the invention, the ratio of the span lengths of the inner span, the middle span and the outer span ranges from 1:1:1 to 1:1:1.3. this arrangement ensures that the outer section of the blade span is as much airflow as possible, thereby ensuring the rotational speed of the front wind wheel 100.
In order to further increase the mechanical strength of the blade root, in one embodiment of the invention, the maximum chord of the inner span of the leading blade 101 is located at 1/5 to 2/5 of the overall span of the blade, preferably the maximum chord of the inner span of the leading blade 101 is located at 3/10 of the overall span of the blade, thereby helping to increase the mechanical strength of the blade root as much as possible while satisfying the fluid properties.
On the other hand, the maximum chord of the inner span of the trailing blade 201 is located at 1/10 to 3/10 of the overall span of the blade, preferably at 1/5 of the overall span of the blade, to thereby help to increase the mechanical strength of the blade root as much as possible while satisfying the fluid properties.
In addition, the maximum chord length of the outer span of the front blade 101 may be set to be the same as the maximum chord length of the inner span, and the maximum chord length of the outer span may be located at any position of the outer span, for example, the maximum chord length may be located at the end of the outer span, that is, the maximum chord length may be located at the end of the blade. However, the blade tip is also subject to resistance to airflow as it rotates, and in order to effectively reduce the resistance to blade tip, in one embodiment of the present invention, the maximum chord of the outer span of the front blade 101 is located at 3/5 to 4/5 of the overall span of the blade, preferably 7/10 of the overall span of the blade. In other words, the maximum chord length is approximately located at the middle part of the outer-section blade span, so that the curve of one side edge of the outer-section blade span is approximately arc-shaped, and the tail end of the outer-section blade span (namely the tail end of the blade) can have smaller chord length, thereby reducing the contact area between the outer-section blade span and the air flow and reducing the resistance born by the tail end of the blade.
It should be appreciated that the longitudinal cross-sectional shape of the inner span of the front blade 101 may be provided in a variety of shapes, for example, the longitudinal cross-section of the inner span of the front blade 101 may be wavy, triangular or trapezoidal.
In order to reduce the weight of the blade and increase the rotation efficiency of the blade, in one embodiment of the present invention, the thickness of the front blade 101 is gradually reduced in the direction from the inner-section blade span to the outer-section blade span, and likewise, the thickness of the rear blade 201 is gradually reduced in the direction from the inner-section blade span to the outer-section blade span. By means of the gradually decreasing thickness, the weight of the blade is effectively reduced, and the root of the blade (i.e. the part of the inner section where the blade has the greatest thickness) has a certain thickness to prevent the blade from bending and breaking.
To increase the rotational speed of the rear wind wheel 200, in one embodiment of the present invention, the inner span of the front blade 101 has a relative thickness D/L of 50% at 15% to 17% from the blade root, the inner span of the front blade 101 has a relative thickness D/L of 40% at 19% to 21% from the blade root, and the inner span of the front blade 101 has a relative thickness D/L of 35% at 23% to 25% from the blade root, where D is the blade thickness and L is the blade chord length. This arrangement provides a faster rate of change of the relative thickness of the inner shroud, further reducing the energy attenuation caused by the inner shroud to the airflow, and thus providing more airflow to the rear wind wheel 200 to increase its rotational speed.
On the other hand, the outer span of the front blade 101 may also be designed, for example, where the relative thickness D/L of the outer span of the front blade 101 is 25% at 52% to 54% from the blade root, where the relative thickness D/L of the outer span of the front blade 101 is 21% at 66% to 72% from the blade root, and where the relative thickness D/L of the outer span of the front blade 101 is 15% at the tip of the blade. This arrangement makes the rate of change of the relative thickness of the outer span of the front blades 101 slower, further increasing the contact time of the outer span with the air flow, thereby increasing the rotational speed of the front wind wheel 100.
It should be understood that both sides of the front blade 101 may be designed as wavy curves, so long as the chord length relationship among the inner span, the middle span, and the outer span of the blade is ensured.
To further optimize the rotational performance of the front wind wheel 100, in one embodiment of the present invention, the front blades 101 are: the longitudinal section is shaped in a way that one side is a straight line and the other side is a curve protruding outwards. The outwardly projecting portions are effective in contact with the airflow and the straight side also provides a better reduction in drag on the blade as it rotates.
Since the front wind wheel 100 is first in contact with the air flow, the utilization of the kinetic energy of the air flow by the front wind wheel 100 is maximized, and for this reason, in one embodiment of the present invention, the front wind wheel 100 is designed to be larger than the rear wind wheel 200, for example, the rear blades 201 are extended to 60% to 80% of the length of the front blades 101, and preferably, the rear blades 201 are extended to 70% of the length of the front blades 101.
Further, in one embodiment of the present invention, the spacing between front wind wheel 100 and rear wind wheel 200 is 0.25 times the diameter of front wind wheel 100. In the range, the installation requirements of the front wind wheel and the rear wind wheel can be met, the mutual interference of the front wind wheel and the rear wind wheel is small, and the utilization rate of wind energy is improved.
Through the technical scheme, when the front wind wheel 100 and the rear wind wheel 200 of the wind wheel mechanism of the wind power generation device simultaneously rotate, the first rotor and the second rotor of the double-shaft generator can be simultaneously driven to rotate for generating electricity, so that the generated electricity is improved, and the front wind wheel 100 and the rear wind wheel 200 can be jointly arranged on the support column of the same wind power generation device, so that the number of the wind power generation devices can be greatly reduced, and the area required by wind power generation is reduced.
In addition, since the front blade 101 is provided as: the maximum chord length of the middle section blade span is smaller than that of the outer section blade span so as to guide fluid to flow to the rear wind wheel 200, thus effectively solving the problem of low combined efficiency of the front wind wheel and the rear wind wheel and improving the overall power generation efficiency of the wind wheel assembly.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "span", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (9)

1. A wind power generation device, characterized in that the wind power generation device comprises a wind wheel mechanism and a double-shaft generator;
the wind wheel mechanism comprises a front wind wheel (100) and a rear wind wheel (200) which are coaxially arranged;
the two ends of the double-shaft generator are respectively provided with a first rotor and a second rotor, the front wind wheel (100) is connected with the first rotor through a first rotating shaft, and the rear wind wheel (200) is connected with the second rotor through a second rotating shaft;
the front wind wheel (100) comprises a plurality of front blades (101), and the rear wind wheel (200) comprises a plurality of rear blades (201);
wherein the front blade (101) comprises an inner section blade span, a middle section blade span and an outer section blade span which are connected in sequence, and the maximum chord length of the middle section blade span is smaller than that of the outer section blade span so as to be capable of guiding fluid to flow to the rear wind wheel (200);
the relative thickness D/L of the inner span of the leading blade (101) is 50% to 17% from the blade root, the relative thickness D/L of the inner span of the leading blade (101) is 40% to 21% from the blade root, the relative thickness D/L of the inner span of the leading blade (101) is 35% to 25% from the blade root, wherein D is the thickness of the blade, L is the chord length of the blade, the relative thickness D/L of the outer span of the leading blade (101) is 25% to 54% from the blade root, the relative thickness D/L of the outer span of the leading blade (101) is 21% to 66% to 72% from the blade root, the relative thickness D/L of the outer span of the leading blade (101) is 15% at the tip of the blade, and the span of the trailing blade (201) is 60% to 80% of the span length of the leading blade (101).
2. Wind power plant according to claim 1, characterized in that the front blade (101) is arranged to: the maximum chord length of the middle section leaf span is smaller than the minimum chord length of the inner section leaf span.
3. Wind power plant according to claim 2, characterized in that the minimum chord length of the mid-span of the rear blade (201) is larger than the maximum chord length of the mid-span of the front blade (101).
4. Wind power plant according to claim 2, characterized in that the front blade (101) is arranged to: the minimum chord length of the inner Duan Shezhan is greater than the maximum chord length of the outer span, and smooth curve transitions are provided between the inner span, the middle span and the outer span.
5. Wind power plant according to claim 4, characterized in that the rear blade (201) is arranged to: the minimum chord length of the inner section leaf span is respectively larger than the maximum chord lengths of the middle section leaf span and the outer section leaf span, and smooth curve transition is formed among the inner section leaf span, the middle section leaf span and the outer section leaf span.
6. The wind power generation apparatus of claim 4, wherein a ratio of a spread length of the inner section spread, the middle section spread, and the outer section spread ranges from 1:1:1 to 1:1:1.3.
7. wind power plant according to claim 4, characterized in that the maximum chord of the inner span of the front blade (101) is located at 1/5 to 2/5 of the overall span of the blade.
8. Wind power plant according to claim 7, characterized in that the maximum chord of the inner span of the rear blade (201) is located at 1/10 to 3/10 of the overall span of the blade.
9. Wind power plant according to claim 4, characterized in that the thickness of the front blades (101) decreases gradually in the direction from the inner to the outer extent; and/or, the thickness of the rear blade (201) gradually decreases along the direction from the inner section to the outer section.
CN202210273330.2A 2022-03-18 2022-03-18 Wind power generation device Active CN114576082B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210273330.2A CN114576082B (en) 2022-03-18 2022-03-18 Wind power generation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210273330.2A CN114576082B (en) 2022-03-18 2022-03-18 Wind power generation device

Publications (2)

Publication Number Publication Date
CN114576082A CN114576082A (en) 2022-06-03
CN114576082B true CN114576082B (en) 2023-05-02

Family

ID=81783266

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210273330.2A Active CN114576082B (en) 2022-03-18 2022-03-18 Wind power generation device

Country Status (1)

Country Link
CN (1) CN114576082B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7074011B1 (en) * 2000-01-26 2006-07-11 Aloys Wobben Wind power installation with two rotors in tandem
CN102536629A (en) * 2010-12-20 2012-07-04 通用电气公司 Wind turbine, aerodynamic assembly for use of wind turbine, and method for assembling thereof
CN105637218A (en) * 2013-08-20 2016-06-01 伊曼纽尔·德米扎基 Wind turbine of low wind speeds
CN113847207A (en) * 2021-09-23 2021-12-28 中国华能集团清洁能源技术研究院有限公司 Double-wind-wheel wind turbine generator set

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140322013A1 (en) * 2009-08-14 2014-10-30 Nikle Industries, LLC Independent variable blade pitch and geometry wind turbine control
WO2014064088A1 (en) * 2012-10-22 2014-05-01 New World Energy Enterprises Ltd A turbine blade system
US10385828B2 (en) * 2016-04-07 2019-08-20 Jordan University Of Science And Technology Adjustable dual rotor wind turbine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7074011B1 (en) * 2000-01-26 2006-07-11 Aloys Wobben Wind power installation with two rotors in tandem
CN102536629A (en) * 2010-12-20 2012-07-04 通用电气公司 Wind turbine, aerodynamic assembly for use of wind turbine, and method for assembling thereof
CN105637218A (en) * 2013-08-20 2016-06-01 伊曼纽尔·德米扎基 Wind turbine of low wind speeds
CN113847207A (en) * 2021-09-23 2021-12-28 中国华能集团清洁能源技术研究院有限公司 Double-wind-wheel wind turbine generator set

Also Published As

Publication number Publication date
CN114576082A (en) 2022-06-03

Similar Documents

Publication Publication Date Title
US9284944B2 (en) Vertical shaft type darius windmill
US7997875B2 (en) Winglet for wind turbine rotor blade
EP2141355A2 (en) Wind turbine blades with multiple curvatures
US20100322770A1 (en) Turbine blade constructions particular useful in vertical-axis wind turbines
US9046075B2 (en) Wind turbine generator
CN101008376A (en) Looseleaf friction reducing and rotary-wing wind turbine generator sets
WO2021093350A1 (en) Active folding wind turbine capable of resisting strong typhoon
US20120217754A1 (en) Wind turbine blade, wind turbine generator with the same, and design method of wind turbine blade
CN108612623A (en) A kind of floating type offshore vertical axis wind powered generator system of blade
KR20090048668A (en) Blade of wind power generator for stall control and steady speed operation in low wind speed
CN201433854Y (en) Helical flexible blade turbine
JP4184847B2 (en) Windmill device and wind power generator using the same
CN114576082B (en) Wind power generation device
CN201593480U (en) Wind turbine blade
KR101851102B1 (en) Electric car having wind power generation function using lift force
CN114576081B (en) Double wind wheel power generation device
CN114576087B (en) Front blade, wind wheel assembly and double wind wheel power generation device
EP2682597A1 (en) Wind turbine blade, wind-powered electricity generator provided with same, and method for designing wind turbine blade
CN114576079A (en) Wind wheel mechanism and wind power generation device
CN217950578U (en) Horizontal axis wind turbine fairing with flow guide function
KR20110008789A (en) Blade for wind power generation and device for wind power generation
CN114576083B (en) Double wind wheel power generation device
KR20100079522A (en) Rotor blade for wind power generation and wind power generator having the same
CN220909892U (en) Vertical wind motor system and vertical wind power generation system
CN117189462B (en) Novel wind driven generator

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant