WO2014006542A2 - Turbine arrangement - Google Patents

Turbine arrangement Download PDF

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Publication number
WO2014006542A2
WO2014006542A2 PCT/IB2013/055239 IB2013055239W WO2014006542A2 WO 2014006542 A2 WO2014006542 A2 WO 2014006542A2 IB 2013055239 W IB2013055239 W IB 2013055239W WO 2014006542 A2 WO2014006542 A2 WO 2014006542A2
Authority
WO
WIPO (PCT)
Prior art keywords
blade
aerofoil
primary
arrangement
turbine
Prior art date
Application number
PCT/IB2013/055239
Other languages
French (fr)
Other versions
WO2014006542A3 (en
Inventor
Russell Leslie PHILLIPS
Original Assignee
Nelson Mandela Metropolitan University
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 Nelson Mandela Metropolitan University filed Critical Nelson Mandela Metropolitan University
Publication of WO2014006542A2 publication Critical patent/WO2014006542A2/en
Publication of WO2014006542A3 publication Critical patent/WO2014006542A3/en
Priority to ZA2014/09109A priority Critical patent/ZA201409109B/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B17/00—Other machines or engines
    • F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
    • F03B17/061—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially in flow direction
    • 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
    • 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
    • F05B2210/00—Working fluid
    • F05B2210/16—Air or water being indistinctly used as working fluid, i.e. the machine can work equally with air or water without any modification
    • 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
    • F05B2240/302—Segmented or sectional 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/78—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism driven or triggered by aerodynamic forces
    • 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
    • Y02E10/20—Hydro energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • THIS invention relates to a turbine arrangement and more particularly but not exclusively, to a new and inventive aerofoil blade arrangement for a fluid driven turbine.
  • An aerofoil also known as an airfoil refers to the shape and configuration of a fluid driven wing or blade, for example that of a turbine, as seen in cross-section. Relative movement between an aerofoil and a working fluid produces an aerodynamic force that comprises a component perpendicular to the direction of relative movement referred to as lift, as well as a component parallel to such movement, called drag.
  • Lift results from a pressure differentia! across opposing sides of the aerofoil in accordance with Bernoulli's principle.
  • the lift of an airfoil primarily results from its angle of attack and the shape of the aerofoil, with the angle of attack being the angle between a chord line of the aerofoil and the fluid flow.
  • Most aerofoils require a positive angle of attack to generate lift, in the case of turbines, each aerofoil design therefore has an optimum angle of attack for a specific combination of fluid flow velocity and aerofoil rotation.
  • ( t is also an object of the invention to provide a turbine arrangement, and more particularly a turbine biade arrangement, which will be a useful alternative to existing turbine designs.
  • a aerofoil blade arrangement for a turbine including:
  • a primary aerofoil blade which is displaceably securable relative to a hub of the turbine in order for the primary aerofoil blade to be rotatable about an axis perpendicular to a rotational axis of the hub;
  • a secondary aerofoil blade which extends from the primary aerofoil blade, and which is securable in a fixed position relative to the primary blade, so that displacement of the secondary aerofoil blade results in rotation of the primary aerofoil blade
  • the primary aerofoil blade is preferably rotatably mounted on a blade support shaft, with the blade support shaft in turn extending radially outwardly from the hub of the turbine.
  • the secondary aerofoil blade to extend from a trailing edge of the primary aerofoil blade, and for the secondary aerofoil blade to be connected to the primary aerofoil blade by way of two rigid connecting arms.
  • the secondary blade is securable in a fixed orientation relative to the connecting arms, and thus the primary aerofoil blade.
  • a further feature of the invention provides for the turbine blade to comprise a plurality of adjacently located Individual sections, with each section including a primary aerofoil which is independently rotatable relative to the blade support shaft.
  • a secondary aerofoil blade extends from each primary aerofoil blade.
  • a turbine including a blade arrangement as described above.
  • Figure 1 is a perspective view of a turbine arrangement in accordance with the invention.
  • Figure 2 is a perspective view of a single blade of an alternative turbine arrangement in accordance with another embodiment of the invention
  • Figure 3 is a cross-sectional end view of the aerofoils of the turbine arrangement, showing a configuration in which no lift is generated
  • Figure 4 is a cross-sectional end view of the aerofoils of the turbine arrangement, showing a configuration in which maximum lift is generated.
  • the turbine arrangement 10 may take many different forms, and the novelty and inventiveness reside in the particular design of the blade arrangement 20. Detail pertaining to ail other aspects of the design, for example the hub, generator and tower, will not be described in any detail, and should also not be in any way be interpreted as limitations. In addition, the turbine arrangement is not limited for use with any particular working fluid, and the concept will find application in wind, hydro and any other fluid driven turbines.
  • the turbine arrangement 10 comprises a rotor 11 comprising a hub 12 from which a plurality of blade arrangements 20 extend.
  • the rotor 1 is rotatab!e about a horizontal axis (arrow A), and in use may drive a generator (not shown).
  • Each blade arrangement 20 comprises a supports shaft 21 that extends radially outwardly from the hub 12.
  • the support shaft 21 is in the form of a structural element having a circular cross-section.
  • One or more primary aerofoil blades 22 are mounted on the support shaft 21. However, contrary to prior art designs, the primary aerofoil blades 22 are not mounted in a fixed orientation relative to the hub 12, but are allowed freely to pivot or rotate about the support shaft 21 , as indicated by arrow B.
  • At least one secondary aerofoil blade 23 extends from a trailing edge of each primary aerofoil blade 22, and is secured to the primary aerofoil blade 22 by way of rigid connecting arms 24. Displacement of the secondary aerofoil blade 23 will therefore cause the primary aerofoil blade 22 to rotate due to a moment induced about the connecting arms 24.
  • the secondary aerofoil blade 23 can be set in a required orientation, but can also be adjusted about a pivot axis 25, This adjustment can be a manual process, but it is also foreseen for the adjustment to be controlled adjustment during operation, if required.
  • the blade arrangement 20 may consist of a single primary aerofoil blade 21 guided by a single secondary aerofoil blade 23 (as is schematically shown in Figure 2), but may also include more than one set of primary and secondary blades, with each set being independently displaceable about the support shaft. tn use, the smaller secondary aerofoil blade 23 controls the angle of attack ( ⁇ ) of the primary aerofoil blade 22.
  • ⁇ angle of attack
  • blade 23 is however deflected to an angle ( ⁇ ) in relation to that of the primary aerofoil blade 22, lift is produced and rotation of the hub 12 and thus the output shaft, occurs.
  • Maximum power is likely to be attained when ⁇ is set to the angle giving optimal lift/drag for the aerofoi! utilized for the primary aerofoil blade 22.
  • the angle ⁇ is maintained at all rotational speeds and fluid speeds, resulting in maximum performance across the entire operating spectrum.
  • the power output of the turbine can be controlled seamlessly from zero to maximum offering full control of the turbine (particularly important for safety of wind turbines in storm conditions).
  • the secondary aerofoil blade will always trail, and will be parallel to the local relative airflow directly. If a primary aerofoil blade with a low pitching moment is selected, the secondary aerofoil blade will have enough authority to maintain the primary aerofoil blade at an optimum angle, irrespective of the speed of rotation of the turbine or the velocity of the working fluid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Wind Motors (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

THIS invention relates to a turbine arrangement and more particularly but not exclusively, to a new and inventive aerofoil blade arrangement for a fluid driven turbine. The aerofoil arrangement includes a primary aerofoil blade which is displaceably securable relative to a hub of the turbine in order for the primary aerofoil blade to be rotatable about an axis perpendicular to a rotational axis of the hub; and a secondary aerofoil blade which extends from the primary aerofoil blade. The secondary aerofoil is securable in a fixed position relative to the primary blade, so that displacement of the secondary aerofoil blade results in rotation of the primary aerofoil blade, in order for the secondary aerofoil blade to control an angle of attack of the primary aerofoil blade to an optimum angle.

Description

TURBINE ARRANGEMENT
BACKGROUND TO THE INVENTION
THIS invention relates to a turbine arrangement and more particularly but not exclusively, to a new and inventive aerofoil blade arrangement for a fluid driven turbine.
An aerofoil (also known as an airfoil) refers to the shape and configuration of a fluid driven wing or blade, for example that of a turbine, as seen in cross-section. Relative movement between an aerofoil and a working fluid produces an aerodynamic force that comprises a component perpendicular to the direction of relative movement referred to as lift, as well as a component parallel to such movement, called drag.
Lift results from a pressure differentia! across opposing sides of the aerofoil in accordance with Bernoulli's principle. The lift of an airfoil primarily results from its angle of attack and the shape of the aerofoil, with the angle of attack being the angle between a chord line of the aerofoil and the fluid flow. Most aerofoils require a positive angle of attack to generate lift, in the case of turbines, each aerofoil design therefore has an optimum angle of attack for a specific combination of fluid flow velocity and aerofoil rotation.
Existing wind, hydro and other fluid driven turbines typically have blades whose cross section is shaped in the form of a lift-producing aerofoil, as described above. To produce the maximum lift force and hence the maximum power output, the angle of attack should be kept at an optimum angle. To attempt to achieve this, the blades may be twisted to account for the varying relative blade speed along the length of the blade, and may also incorporate a pitch change mechanism to rotate the entire blade. However, the actual angle of attack at various points along the biade is determined by the vector sum of the linear velocity due to rotation and the fiuid flow velocity. It is therefore not possible to obtain optimal angle at all points along the blade at all rotational / fluid velocity combinations. The turbine is therefore not optimal in terms of power output though the entire spectrum of likely fluid/rotational speeds.
It is accordingly an object of the invention to provide a turbine arrangement, and more particularly a turbine blade arrangement that will, at least partially, alleviate the above disadvantages.
(t is also an object of the invention to provide a turbine arrangement, and more particularly a turbine biade arrangement, which will be a useful alternative to existing turbine designs.
SU ARY OF THE INVENTION
According to the invention there is provided a aerofoil blade arrangement for a turbine, the blade arrangement including:
a primary aerofoil blade which is displaceably securable relative to a hub of the turbine in order for the primary aerofoil blade to be rotatable about an axis perpendicular to a rotational axis of the hub; and
a secondary aerofoil blade which extends from the primary aerofoil blade, and which is securable in a fixed position relative to the primary blade, so that displacement of the secondary aerofoil blade results in rotation of the primary aerofoil blade,
in order for the secondary aerofoil blade to control an angle of attack of the primary aerofoil blade to an optimum angle.
The primary aerofoil blade is preferably rotatably mounted on a blade support shaft, with the blade support shaft in turn extending radially outwardly from the hub of the turbine.
There is provided for the secondary aerofoil blade to extend from a trailing edge of the primary aerofoil blade, and for the secondary aerofoil blade to be connected to the primary aerofoil blade by way of two rigid connecting arms.
The secondary blade is securable in a fixed orientation relative to the connecting arms, and thus the primary aerofoil blade.
There is provided for the fixed orientation to be adjustable and/or controllable. A further feature of the invention provides for the turbine blade to comprise a plurality of adjacently located Individual sections, with each section including a primary aerofoil which is independently rotatable relative to the blade support shaft.
Preferably, a secondary aerofoil blade extends from each primary aerofoil blade.
According to a further aspect there is provided a turbine including a blade arrangement as described above.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention is described by way of a non- limiting example, and with reference to the accompanying drawings in which:
Figure 1 is a perspective view of a turbine arrangement in accordance with the invention;
Figure 2 is a perspective view of a single blade of an alternative turbine arrangement in accordance with another embodiment of the invention; Figure 3 is a cross-sectional end view of the aerofoils of the turbine arrangement, showing a configuration in which no lift is generated; and
Figure 4 is a cross-sectional end view of the aerofoils of the turbine arrangement, showing a configuration in which maximum lift is generated.
DETAILED DESCRIPTION OF INVENTION
Referring to the drawings, in which like numerals indicate like features, a non-limiting example of a turbine arrangement in accordance with the invention is generally indicated by reference numeral 10.
The turbine arrangement 10 may take many different forms, and the novelty and inventiveness reside in the particular design of the blade arrangement 20. Detail pertaining to ail other aspects of the design, for example the hub, generator and tower, will not be described in any detail, and should also not be in any way be interpreted as limitations. In addition, the turbine arrangement is not limited for use with any particular working fluid, and the concept will find application in wind, hydro and any other fluid driven turbines.
The turbine arrangement 10 comprises a rotor 11 comprising a hub 12 from which a plurality of blade arrangements 20 extend. The rotor 1 is rotatab!e about a horizontal axis (arrow A), and in use may drive a generator (not shown). Each blade arrangement 20 comprises a supports shaft 21 that extends radially outwardly from the hub 12. The support shaft 21 is in the form of a structural element having a circular cross-section. One or more primary aerofoil blades 22 are mounted on the support shaft 21. However, contrary to prior art designs, the primary aerofoil blades 22 are not mounted in a fixed orientation relative to the hub 12, but are allowed freely to pivot or rotate about the support shaft 21 , as indicated by arrow B. At least one secondary aerofoil blade 23 extends from a trailing edge of each primary aerofoil blade 22, and is secured to the primary aerofoil blade 22 by way of rigid connecting arms 24. Displacement of the secondary aerofoil blade 23 will therefore cause the primary aerofoil blade 22 to rotate due to a moment induced about the connecting arms 24. The secondary aerofoil blade 23 can be set in a required orientation, but can also be adjusted about a pivot axis 25, This adjustment can be a manual process, but it is also foreseen for the adjustment to be controlled adjustment during operation, if required.
The blade arrangement 20 may consist of a single primary aerofoil blade 21 guided by a single secondary aerofoil blade 23 (as is schematically shown in Figure 2), but may also include more than one set of primary and secondary blades, with each set being independently displaceable about the support shaft. tn use, the smaller secondary aerofoil blade 23 controls the angle of attack (Θ) of the primary aerofoil blade 22. When the chord line of the secondary aerofoil blade 23 is parallel to that of the primary aerofoil blade 22 (shown in Figure 3) no lift is produced, and the power output of the turbine is zero. When the chord line of the secondary aerofoi! blade 23 is however deflected to an angle (Θ) in relation to that of the primary aerofoil blade 22, lift is produced and rotation of the hub 12 and thus the output shaft, occurs. Maximum power is likely to be attained when Θ is set to the angle giving optimal lift/drag for the aerofoi! utilized for the primary aerofoil blade 22. The angle Θ is maintained at all rotational speeds and fluid speeds, resulting in maximum performance across the entire operating spectrum. Furthermore, the power output of the turbine can be controlled seamlessly from zero to maximum offering full control of the turbine (particularly important for safety of wind turbines in storm conditions).
The secondary aerofoil blade will always trail, and will be parallel to the local relative airflow directly. If a primary aerofoil blade with a low pitching moment is selected, the secondary aerofoil blade will have enough authority to maintain the primary aerofoil blade at an optimum angle, irrespective of the speed of rotation of the turbine or the velocity of the working fluid.
It will be appreciated that the above is only one embodiment of the invention and that there may be many variations without departing from the spirit and/or the scope of the invention.

Claims

CLAIMS:
1. A b!ade arrangement for a turbine, the b!ade arrangement including:
a primary aerofoil blade which is displaceably securable relative to a hub of the turbine in order for the primary aerofoil blade to be rotatable about an axis perpendicular to a rotational axis of the hub; and
a secondary aerofoil blade which extends from the primary aerofoil blade, and which is securable in a fixed position relative to the primary blade, so that displacement of the secondary aerofoil blade results in rotation of the primary aerofoil blade,
in order for the secondary aerofoil blade to control an angle of attack of the primary aerofoil blade to an optimum angle.
2. The blade arrangement of claim 1 in which the primary aerofoil blade is rotatab!y mounted on a blade support shaft, with the blade support shaft in turn extending radially outwardly from the hub of the turbine.
3. The blade arrangement of claim 1 or claim 2 in which the secondary aerofoil blade extends from a trailing edge of the primary aerofoil blade.
4. The blade arrangement of any one of the preceding claims in which the secondary aerofoil blade is connected to the primary aerofoil blade by way of two rigid connecting arms.
5. The blade arrangement of claim 4 in which the secondary blade is securable in a fixed orientation relative to the connecting arms, and thus the primary aerofoil blade.
6. The blade arrangement of claim 5 in which the fixed orientation is adjustable and/or controllable.
7. The blade arrangement of any one of the preceding claims in which the turbine blade comprises a plurality of adjacently located individual sections, with each section including a primary aerofoil which is independently rotatable relative to the blade support shaft.
8. The blade arrangement of claim 7 in which a secondary aerofoil blade extends from at least one of the primary aerofoil blades.
9. The blade arrangement of claim 7 in which a secondary aerofoil blade extends from each of the primary aerofoil blades.
10. A turbine including a biade as claimed in any one of ciaims 1 to 9.
PCT/IB2013/055239 2012-07-05 2013-06-26 Turbine arrangement WO2014006542A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2014/09109A ZA201409109B (en) 2012-07-05 2014-12-11 Turbine arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2012/05038 2012-07-05
ZA201205038 2012-07-05

Publications (2)

Publication Number Publication Date
WO2014006542A2 true WO2014006542A2 (en) 2014-01-09
WO2014006542A3 WO2014006542A3 (en) 2014-03-27

Family

ID=49223797

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2013/055239 WO2014006542A2 (en) 2012-07-05 2013-06-26 Turbine arrangement

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WO (1) WO2014006542A2 (en)
ZA (1) ZA201409109B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016011833A1 (en) * 2014-07-24 2016-01-28 南京航空航天大学 Apparatus for controlling load and deformation of wind turbine blade
EP3179093A1 (en) * 2015-12-08 2017-06-14 Winfoor AB Rotor blade for a wind turbine and a sub-member
USD822602S1 (en) 2015-10-29 2018-07-10 Winfoor Ab Triblade
GB2558780A (en) * 2016-12-02 2018-07-18 Zyba Renewables Ltd Wave energy device
US20180328334A1 (en) * 2017-05-10 2018-11-15 Gerald L. Barber Segmented Airfoil Design For Guide Wires
WO2020016418A1 (en) * 2018-07-20 2020-01-23 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno System and method for aerodynamic torsion damping of wind turbine rotor blade
CN114215684A (en) * 2021-12-16 2022-03-22 李福军 Wind power blade and wind power generation device
US11359608B2 (en) 2017-05-10 2022-06-14 Gerald L. Barber Segmented airfoil design for guide wires

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US4423333A (en) * 1982-02-02 1983-12-27 Rossman Wendell E Horizontal axis wind energy conversion system with aerodynamic blade pitch control
NL8201303A (en) * 1982-03-30 1983-10-17 Energa Adviesbureau Voor Alter Wind turbine with rotating guide vane - effective at fluctuating wind conditions and positioned near root of blades having adjustable support arms
CA2425447C (en) * 2003-04-17 2006-03-14 Michel J. L. Auclair Wind turbine blade unit
FR2864175B1 (en) * 2003-12-22 2008-03-28 Airbus WIND TURBINE
US8454313B2 (en) * 2009-08-14 2013-06-04 Benjamin T. Elkin Independent variable blade pitch and geometry wind turbine

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016011833A1 (en) * 2014-07-24 2016-01-28 南京航空航天大学 Apparatus for controlling load and deformation of wind turbine blade
USD822602S1 (en) 2015-10-29 2018-07-10 Winfoor Ab Triblade
EP3179093A1 (en) * 2015-12-08 2017-06-14 Winfoor AB Rotor blade for a wind turbine and a sub-member
WO2017097677A1 (en) * 2015-12-08 2017-06-15 Winfoor Ab Rotor blade for a wind turbine
GB2558780A (en) * 2016-12-02 2018-07-18 Zyba Renewables Ltd Wave energy device
US10941751B2 (en) * 2017-05-10 2021-03-09 Gerald L. Barber Segmented airfoil design for guide wires
KR20200026807A (en) * 2017-05-10 2020-03-11 제랄드 엘. 바버 Segmented airfoil design for guide wire
JP2020519808A (en) * 2017-05-10 2020-07-02 バーバー，ジェラルド Split airfoil design for guidewires
US20180328334A1 (en) * 2017-05-10 2018-11-15 Gerald L. Barber Segmented Airfoil Design For Guide Wires
US11359608B2 (en) 2017-05-10 2022-06-14 Gerald L. Barber Segmented airfoil design for guide wires
JP7109478B2 (en) 2017-05-10 2022-07-29 バーバー，ジェラルド Segmented airfoil design for guidewires
KR102456686B1 (en) * 2017-05-10 2022-10-19 제랄드 엘. 바버 Segmented airfoil design for guide wire
WO2020016418A1 (en) * 2018-07-20 2020-01-23 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno System and method for aerodynamic torsion damping of wind turbine rotor blade
CN114215684A (en) * 2021-12-16 2022-03-22 李福军 Wind power blade and wind power generation device

Also Published As

Publication number Publication date
WO2014006542A3 (en) 2014-03-27
ZA201409109B (en) 2016-08-31

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