WO2009105835A1 - An airfoil for a vertical axis wind turbine - Google Patents

An airfoil for a vertical axis wind turbine Download PDF

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Publication number
WO2009105835A1
WO2009105835A1 PCT/AU2009/000250 AU2009000250W WO2009105835A1 WO 2009105835 A1 WO2009105835 A1 WO 2009105835A1 AU 2009000250 W AU2009000250 W AU 2009000250W WO 2009105835 A1 WO2009105835 A1 WO 2009105835A1
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WO
WIPO (PCT)
Prior art keywords
airfoil
wind turbine
leading surface
longitudinally extending
vertical axis
Prior art date
Application number
PCT/AU2009/000250
Other languages
French (fr)
Inventor
Joseph Bertony
Original Assignee
Windworks Engineering Limited
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
Priority claimed from AU2008900975A external-priority patent/AU2008900975A0/en
Application filed by Windworks Engineering Limited filed Critical Windworks Engineering Limited
Publication of WO2009105835A1 publication Critical patent/WO2009105835A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D3/00Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06Rotors
    • F03D3/061Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00Components
    • F05B2240/20Rotors
    • F05B2240/21Rotors for wind turbines
    • F05B2240/211Rotors for wind turbines with vertical axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00Components
    • F05B2240/20Rotors
    • F05B2240/30Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/301Cross-section characteristics
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00Geometry
    • F05B2250/70Shape
    • F05B2250/71Shape curved
    • F05B2250/712Shape curved concave
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/74Wind turbines with rotation axis perpendicular to the wind direction

Definitions

  • the present invention relates to an airfoil for a vertical axis wind turbine.
  • Airfoils for vertical axis wind turbines have a shape that differs from the propeller- like shapes of airfoils for horizontal axis wind turbines.
  • the airfoils of horizontal axis wind turbine always face towards the wind during operation. This is different to vertical axis wind turbines; airfoils of the vertical axis wind turbine change their aspect relative to the prevailing wind as they rotate, and thus efficient designs have been challenging.
  • an airfoil for a vertical axis wind turbine having a longitudinal axis and first and second ends and having a longitudinal twist between the first and second ends, the airfoil further having a leading surface and an opposite trailing surface extending between the first and second ends, the trailing surface having at least one longitudinally extending concave recess and the leading surface having at least one longitudinally extending concave recess.
  • the leading surface typically has a plurality of longitudinally extending concave recesses and the trailing surface typically has one longitudinally extending concave recess .
  • Conventional airfoils of vertical axis wind turbines typically are semi-cylindrical and have a semi-circular cross-sectional shape. These airfoils have a convex leading surface and a concave trailing surface.
  • the trailing surface of the airfoil in accordance with the embodiments of the present invention has a different shape that provides has significant advantages.
  • the leading surface of the airfoil of the present invention also has at least one longitudinally extending concave recess.
  • wind turbine having a plurality of such airfoils may generate a first torque produced by air incident upon the trailing surface of the airfoils and also an additional second torque produced by air incident on the at least one concave recess of the leading surface.
  • the longitudinally extending concave recesses of the leading surface may have cross-sectional shapes that correspond to a portion of a sphere having a radius that may be at least 2, 5, 10, 20 or even 50 times larger that a width of the airfoil.
  • the airfoil has a cross -sectional shape that is substantially constant along the twist of the twisted airfoil.
  • the leading surface of the airfoil has three longitudinal extending concave recesses, which may be adjacent each other and at least two of the concave recesses may have a cross-sectional shape that corresponds to a portion of a sphere, each having a differing radius.
  • the leading surface of the airfoil also has a longitudinally extending convex portion.
  • the convex portion may lead the at least one longitudinally extending concave recesses with respect to the direction of rotation of the airfoil.
  • the convex portion may be adjacent the concave recesses.
  • the convex portion may be part circular when viewed in transverse cross-section.
  • An axis about which the airfoil is twisted is outside the airfoil, typically offset relative to an inner face of the airfoil .
  • a wind turbine assembly may comprise a plurality of such airfoils and each axis about which a respective airfoil is twisted may coincide with a vertical axis of a wind turbine assembly, or may alternatively be parallel and spaced apart form the vertical axis of the wind turbine assembly. Positioning of the axis of each airfoil relative to the vertical axis of the wind turbine assembly allows modification of performance properties of the wind turbine assembly. For example, by shifting or rotating the airfoils about the axis of the wind turbine assembly by a small amount, an outside diameter of the wind turbine assembly may be varied so that the wind turbine assembly is "opened” or "closed” to airflow.
  • an airfoil assembly comprising at least one, typically three, of the above-defined airfoils.
  • a vertical axis wind turbine comprising the airfoil assembly in accordance with the second aspect of the present invention.
  • Fig. 1 is a side elevation of an embodiment of a wind turbine having three airfoils
  • Fig. 2 is a plan view of the airfoils of Fig. 1
  • Fig. 3 is a horizontal cross-section taken through one of the airfoils of Figs. 1 and 2
  • Fig. 4 is a front elevation of one of the airfoils of
  • Fig. 5 - 7 are each a view similar to Fig. 3 but illustrating wind flow at different stages of the airfoil rotation.
  • the vertical axis wind turbine 1 has a central mast 3 and three airfoils 4 which extend, in this embodiment, between an upper disc 6 and a lower disc 7.
  • Each airfoil 4 has a leading surface 14 and a trailing surface 15.
  • each airfoil 4 has an upper edge 11 and a lower edge 12 as shown in Fig. 4.
  • the lower edge 12 is twisted relative to the upper edge 11, by approximately 98 degrees, in this embodiment, so as to provide a twist for each of the airfoil 4.
  • An axis about which the airfoil is twisted is outside the airfoil. Other degrees of twist may be employed as suitable.
  • a 15OkW turbine typically has a vertical extent between the discs 6, 7 of approximately 13 metres and a diameter of approximately 5-6 metres.
  • the leading surface 14 is shaped to produce a force when wind is incident upon it, this force being created by a pressure difference between the air adjacent the leading surface 14 and air adjacent the trailing surface 15.
  • the trailing surface 15 is shaped to create drag when air is incident upon it.
  • the turbine 1 has a first torque produced by air incident upon the trailing surface 15 of one of the airfoils 4 and also experiences a second torque created by the drag produced by air incident on the leading surface 15 of an opposite airfoil 4.
  • the torque causing rotation of the wind turbine 1 is the sum of the torques .
  • a transverse cross-section through any one of the airfoils 4 is illustrated.
  • this transverse cross -section is constant irrespective of the distance between the upper edge 11 and the cross -section or the lower edge 12 and the cross- section.
  • the cross-section is the same irrespective of the height at which it is taken.
  • the leading surface 14 is formed by a first convex portion having a radius of curvature Rl, a second convex portion having a radius of curvature R2 , a first concave portion having a radius of curvature R3 , a second concave portion having a radius of curvature R4 and a third concave region having a radius of curvature R5.
  • the trailing surface 15 consists of two essentially flat surfaces interconnected by a curved portion having a radius of curvature R6. The configuration of the trailing surface 15 is not critical compared to that of the leading surface 14.
  • Typical ratios of an airfoil width to an airfoil length are between 2.5 and 4.5 and the ratio of a single airfoil assembly for a vertical axis wind turbine can be between 3.3 and 6.
  • some embodiments may have a different number of radii and/or different dimensions. Some embodiments may be scaled up or down version of this embodiment .
  • FIG. 4 a single airfoil 4 is illustrated.
  • each of the six above regions will be referred to as R1-R6 respectively, so that region R3 has a radius of curvature R3 , and so on .
  • R1-R6 regions extending across the leading surface 14 are indicated in sequence R1-R5 which respectively refer to the first convex region Rl, the second convex region R2, the first concave region R3 , the second concave region R4 and the third concave region R5.
  • the consequence of the first convex region R3 is to induce a vortex indicated by arrow 2OB in Fig. 5.
  • the pressure within the vortex 2OB is less than the pressure behind the trailing surface 15 and thus the airfoil 4 experiences a net force which operates to turn the airfoil clockwise as seen in Fig. 5.
  • the airfoil 4 begins to rotate because of the incident air flow indicated by arrows 2OA.
  • Fig. 6 the situation is illustrated at a time just after the situation illustrated in Fig. 5.
  • the wind continues to blow from the east but the airfoil 4 has turned slightly so that the angle between the air flow indicated by arrows 21A and the airfoil 4 illustrated in Fig. 6 is different than illustrated in Fig 5.
  • the vortex 2OB previously induced at region R3 is now substantially diminished (as indicated by broken lines in Fig. 6) and a new vortex 21B is induced at region R4.
  • the air pressure at region R4 is reduced relative to the air pressure on the trailing surface 15 and so the airfoil 4 continues to experience a force turning the airfoil 4 clockwise as seen in Fig. 6.
  • FIG. 7 the position of the airfoil 4 in Fig. 7 is further turned again from the position illustrated in Fig. 6.
  • the wind which still blows from the east is now illustrated by air flow 22A which results in a reduced or diminished vortex 21B and a new vortex 22B induced at region R5.
  • the pressure within the vortex 22B is reduced relative to the air pressure at the trailing surface 15 and thus again the airfoil 4 continues to experience a torque or turning force which maintains the clockwise rotation of the airfoil 4.
  • some embodiments may comprise more or less than 3 concavities on the leading surface.
  • the surface defining one or more of the recesses may define a volume which is part of an ovoid.

Abstract

The present disclosure provides an airfoil for a vertical axis wind turbine. The airfoil comprises an elongated member having a longitudinal axis and first and second ends. The airfoil has a longitudinal twist between the first and second ends and has a leading surface (14) and an opposite trailing surface (15) extending between the first and second ends. The trailing surface and also the leading surface of the airfoil have at least one concave longitudinally extending recess.

Description

AN AIRFOIL FOR A VERTICAL AXIS WIND TURBINE
Field of the Invention
The present invention relates to an airfoil for a vertical axis wind turbine.
Background of the Invention
Airfoils for vertical axis wind turbines have a shape that differs from the propeller- like shapes of airfoils for horizontal axis wind turbines. The airfoils of horizontal axis wind turbine always face towards the wind during operation. This is different to vertical axis wind turbines; airfoils of the vertical axis wind turbine change their aspect relative to the prevailing wind as they rotate, and thus efficient designs have been challenging.
Summary of the Invention
According to a first aspect of the present invention there is provided an airfoil for a vertical axis wind turbine, the airfoil having a longitudinal axis and first and second ends and having a longitudinal twist between the first and second ends, the airfoil further having a leading surface and an opposite trailing surface extending between the first and second ends, the trailing surface having at least one longitudinally extending concave recess and the leading surface having at least one longitudinally extending concave recess.
The leading surface typically has a plurality of longitudinally extending concave recesses and the trailing surface typically has one longitudinally extending concave recess . Conventional airfoils of vertical axis wind turbines typically are semi-cylindrical and have a semi-circular cross-sectional shape. These airfoils have a convex leading surface and a concave trailing surface. In contrast, the trailing surface of the airfoil in accordance with the embodiments of the present invention has a different shape that provides has significant advantages. The leading surface of the airfoil of the present invention also has at least one longitudinally extending concave recess. As a result, wind turbine having a plurality of such airfoils may generate a first torque produced by air incident upon the trailing surface of the airfoils and also an additional second torque produced by air incident on the at least one concave recess of the leading surface.
The longitudinally extending concave recesses of the leading surface may have cross-sectional shapes that correspond to a portion of a sphere having a radius that may be at least 2, 5, 10, 20 or even 50 times larger that a width of the airfoil.
In an embodiment, the airfoil has a cross -sectional shape that is substantially constant along the twist of the twisted airfoil.
In an embodiment, the leading surface of the airfoil has three longitudinal extending concave recesses, which may be adjacent each other and at least two of the concave recesses may have a cross-sectional shape that corresponds to a portion of a sphere, each having a differing radius.
In an embodiment, the leading surface of the airfoil also has a longitudinally extending convex portion. The convex portion may lead the at least one longitudinally extending concave recesses with respect to the direction of rotation of the airfoil. The convex portion may be adjacent the concave recesses. The convex portion may be part circular when viewed in transverse cross-section.
An axis about which the airfoil is twisted is outside the airfoil, typically offset relative to an inner face of the airfoil .
A wind turbine assembly may comprise a plurality of such airfoils and each axis about which a respective airfoil is twisted may coincide with a vertical axis of a wind turbine assembly, or may alternatively be parallel and spaced apart form the vertical axis of the wind turbine assembly. Positioning of the axis of each airfoil relative to the vertical axis of the wind turbine assembly allows modification of performance properties of the wind turbine assembly. For example, by shifting or rotating the airfoils about the axis of the wind turbine assembly by a small amount, an outside diameter of the wind turbine assembly may be varied so that the wind turbine assembly is "opened" or "closed" to airflow.
According to a second aspect of the invention there is provided an airfoil assembly comprising at least one, typically three, of the above-defined airfoils.
According to a third aspect of the invention there is provided a vertical axis wind turbine comprising the airfoil assembly in accordance with the second aspect of the present invention.
Brief Description of the Figures
An embodiment of the invention will now be described, by way of example only in order to achieve a better understanding of it, with reference to the accompanying drawings in which:
Fig. 1 is a side elevation of an embodiment of a wind turbine having three airfoils,
Fig. 2 is a plan view of the airfoils of Fig. 1, Fig. 3 is a horizontal cross-section taken through one of the airfoils of Figs. 1 and 2, Fig. 4 is a front elevation of one of the airfoils of
Fig . 1 , and
Fig. 5 - 7 are each a view similar to Fig. 3 but illustrating wind flow at different stages of the airfoil rotation.
Detailed Description of Embodiments of the Invention
An airfoil for a vertical axis wind turbine in accordance with embodiment of the present invention is now described with reference to Figs. 1-7. The vertical axis wind turbine 1 has a central mast 3 and three airfoils 4 which extend, in this embodiment, between an upper disc 6 and a lower disc 7. Each airfoil 4 has a leading surface 14 and a trailing surface 15. In addition each airfoil 4 has an upper edge 11 and a lower edge 12 as shown in Fig. 4. The lower edge 12 is twisted relative to the upper edge 11, by approximately 98 degrees, in this embodiment, so as to provide a twist for each of the airfoil 4. An axis about which the airfoil is twisted is outside the airfoil. Other degrees of twist may be employed as suitable. Because of this pitch wind which is incident on the leading surface 14 is directed downwardly and wind which is incident on the trailing surface 15 is directed upwardly. A 15OkW turbine typically has a vertical extent between the discs 6, 7 of approximately 13 metres and a diameter of approximately 5-6 metres.
The leading surface 14 is shaped to produce a force when wind is incident upon it, this force being created by a pressure difference between the air adjacent the leading surface 14 and air adjacent the trailing surface 15. Similarly, the trailing surface 15 is shaped to create drag when air is incident upon it.
As a result of the above described arrangement the turbine 1 has a first torque produced by air incident upon the trailing surface 15 of one of the airfoils 4 and also experiences a second torque created by the drag produced by air incident on the leading surface 15 of an opposite airfoil 4. The torque causing rotation of the wind turbine 1 is the sum of the torques .
This is to be contrasted with a conventional Savionus vertical axis wind turbine, for example, having two semi- cylindrical opposed airfoils each of which when viewed in transverse cross-section is a semicircle. This conventional arrangement does not produce any airfoil effect on the leading surface. Instead, wind incident upon the leading surface creates a drag which tends to rotate the turbine in one direction whereas wind incident on the trailing surface creates a bigger drag which tends to rotate the wind turbine in the opposite direction.
Thus the wind turbine rotates in the opposite direction but the net torque is the difference between the two drags and consequently is relatively small.
Turning now to Fig. 3, a transverse cross-section through any one of the airfoils 4 is illustrated. In this embodiment this transverse cross -section is constant irrespective of the distance between the upper edge 11 and the cross -section or the lower edge 12 and the cross- section. Thus the cross-section is the same irrespective of the height at which it is taken. In the preferred embodiment the leading surface 14 is formed by a first convex portion having a radius of curvature Rl, a second convex portion having a radius of curvature R2 , a first concave portion having a radius of curvature R3 , a second concave portion having a radius of curvature R4 and a third concave region having a radius of curvature R5. The trailing surface 15 consists of two essentially flat surfaces interconnected by a curved portion having a radius of curvature R6. The configuration of the trailing surface 15 is not critical compared to that of the leading surface 14.
Dimensions for the various radii of curvature, for this embodiment, are as follows:
RADIUS OF CURVATURE DIMENSION (mm)
Rl 620
R2 10,000
R3 20,000
R4 12 , 000 R5 12 , 000
R6 1 , 279
Typical ratios of an airfoil width to an airfoil length are between 2.5 and 4.5 and the ratio of a single airfoil assembly for a vertical axis wind turbine can be between 3.3 and 6.
It will be appreciated that some embodiments may have a different number of radii and/or different dimensions. Some embodiments may be scaled up or down version of this embodiment .
Turning now to Fig. 4, a single airfoil 4 is illustrated. Hereafter for convenience, each of the six above regions will be referred to as R1-R6 respectively, so that region R3 has a radius of curvature R3 , and so on . Thus the various regions extending across the leading surface 14 are indicated in sequence R1-R5 which respectively refer to the first convex region Rl, the second convex region R2, the first concave region R3 , the second concave region R4 and the third concave region R5. The operational consequence of the above described shaped regions will now be described with reference to Figs. 5-7 which indicate an airfoil 4 with its leading surface 14 turning into the wind which in relation to Fig. 5 may be considered to have its horizontal component to be coming from the east (the right hand side of the page) and is indicated by three straight arrows 2OA indicating an initially uniform air flow. The consequence of the first convex region R3 is to induce a vortex indicated by arrow 2OB in Fig. 5. The pressure within the vortex 2OB is less than the pressure behind the trailing surface 15 and thus the airfoil 4 experiences a net force which operates to turn the airfoil clockwise as seen in Fig. 5. As a result the airfoil 4 begins to rotate because of the incident air flow indicated by arrows 2OA.
In Fig. 6, the situation is illustrated at a time just after the situation illustrated in Fig. 5. The wind continues to blow from the east but the airfoil 4 has turned slightly so that the angle between the air flow indicated by arrows 21A and the airfoil 4 illustrated in Fig. 6 is different than illustrated in Fig 5. The vortex 2OB previously induced at region R3 is now substantially diminished (as indicated by broken lines in Fig. 6) and a new vortex 21B is induced at region R4. As a consequence, the air pressure at region R4 is reduced relative to the air pressure on the trailing surface 15 and so the airfoil 4 continues to experience a force turning the airfoil 4 clockwise as seen in Fig. 6.
Turning now to Fig. 7, the position of the airfoil 4 in Fig. 7 is further turned again from the position illustrated in Fig. 6. Thus the wind which still blows from the east is now illustrated by air flow 22A which results in a reduced or diminished vortex 21B and a new vortex 22B induced at region R5. Again, the pressure within the vortex 22B is reduced relative to the air pressure at the trailing surface 15 and thus again the airfoil 4 continues to experience a torque or turning force which maintains the clockwise rotation of the airfoil 4.
It should be born in mind in considering Figs. 5-7 that the air flow indicated by arrows 2OA, 2IA and 22A in addition to moving from right to left across the leading surface 14 of the airfoil 4, is also simultaneously moving downwardly from the upper edge 11 towards the lower edge 12 because of the vertical component of the flow induced by the pitch of the airfoil 4.
It will be understood to persons skilled in the art of the invention that many modifications may be made without departing from the spirit and scope of the invention. For example, some embodiments may comprise more or less than 3 concavities on the leading surface. The surface defining one or more of the recesses may define a volume which is part of an ovoid.
In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as
"comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

Claims

1. An airfoil for a vertical axis wind turbine, the airfoil having a longitudinal axis and first and second ends and having a longitudinal twist between the first and second ends, the airfoil further having a leading surface and an opposite trailing surface extending between the first and second ends, the trailing surface having at least one longitudinally extending concave recess and the leading surface having at least one longitudinally- extending concave recess.
2. The airfoil of claim 1 wherein the leading surface has a plurality of longitudinally extending concave recesses .
3. The airfoil of claim 2 wherein the longitudinally extending concave recesses of the leading surface have cross -sectional shapes that corresponds to a portion of a sphere .
4. The airfoil of claim 3 wherein a radius of at least one sphere is at least 5 larger that a width of the airfoil.
5. The airfoil of claim 3 wherein a radius of at least one sphere is at least 10 larger that a width of the airfoil .
6. The airfoil of claim 3 wherein a radius of at least one sphere is at least 20 larger that a width of the airfoil .
7. The airfoil of any one of the preceding claims having a cross-sectional shape that is substantially constant along the twist of the twisted airfoil.
8. The airfoil of any one of the preceding claims wherein the leading surface of the airfoil has three longitudinally extending concave recesses.
9. The airfoil of claim 8 wherein the longitudinally extending recesses are adjacent each other and at least two of the recesses have a cross-sectional shape that corresponds to portions of spheres having a differing radii .
10. The airfoil of any one of the preceding claims wherein the leading surface of the airfoil also has a longitudinally extending convex portion.
11. The airfoil of claim 10 wherein the convex portion leads the at least one longitudinally extending concave recesses with respect to the direction of rotation of the airfoil .
12. The airfoil of any one of the preceding claims wherein the axis about which the airfoil is twisted is outside the airfoil.
13. An airfoil assembly comprising at least one airfoil in accordance with claims 1- 12.
14. A vertical axis wind turbine comprising the airfoil assembly in accordance claim 13.
PCT/AU2009/000250 2008-02-28 2009-02-27 An airfoil for a vertical axis wind turbine WO2009105835A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2008900975 2008-02-28
AU2008900975A AU2008900975A0 (en) 2008-02-28 Wind Turbine Blade

Publications (1)

Publication Number Publication Date
WO2009105835A1 true WO2009105835A1 (en) 2009-09-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103174604A (en) * 2011-12-26 2013-06-26 珠海市洁源电器有限公司 Small-size wind turbine blade airfoil family
US9243611B2 (en) 2009-09-18 2016-01-26 Hanjun Song Vertical axis wind turbine blade and its wind rotor
WO2019226060A1 (en) * 2018-05-21 2019-11-28 Abt Accord Spółka Z Ograniczoną Odpowiedzialnością A turbine blade and a turbine comprising such a blade

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948060A1 (en) * 1979-11-29 1981-06-04 Erno Raumfahrttechnik Gmbh, 2800 Bremen Wind-driven rotor with vertical shaft - has blades formed by helical strips with ends held between radial spokes on rotor shaft
WO2005010355A1 (en) * 2003-07-24 2005-02-03 Quiet Revolution Limited Vertical-axis wind turbine
US20070104582A1 (en) * 2005-11-04 2007-05-10 Rahai Hamid R Vertical axis wind turbine with optimized blade profile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948060A1 (en) * 1979-11-29 1981-06-04 Erno Raumfahrttechnik Gmbh, 2800 Bremen Wind-driven rotor with vertical shaft - has blades formed by helical strips with ends held between radial spokes on rotor shaft
WO2005010355A1 (en) * 2003-07-24 2005-02-03 Quiet Revolution Limited Vertical-axis wind turbine
US20070104582A1 (en) * 2005-11-04 2007-05-10 Rahai Hamid R Vertical axis wind turbine with optimized blade profile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9243611B2 (en) 2009-09-18 2016-01-26 Hanjun Song Vertical axis wind turbine blade and its wind rotor
CN103174604A (en) * 2011-12-26 2013-06-26 珠海市洁源电器有限公司 Small-size wind turbine blade airfoil family
WO2019226060A1 (en) * 2018-05-21 2019-11-28 Abt Accord Spółka Z Ograniczoną Odpowiedzialnością A turbine blade and a turbine comprising such a blade

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