CA2625070A1 - Wind turbine blade with variable aerodynamic profile - Google Patents

Wind turbine blade with variable aerodynamic profile Download PDF

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Publication number
CA2625070A1
CA2625070A1 CA002625070A CA2625070A CA2625070A1 CA 2625070 A1 CA2625070 A1 CA 2625070A1 CA 002625070 A CA002625070 A CA 002625070A CA 2625070 A CA2625070 A CA 2625070A CA 2625070 A1 CA2625070 A1 CA 2625070A1
Authority
CA
Canada
Prior art keywords
wind turbine
active elastic
elastic member
turbine blade
shape
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.)
Pending
Application number
CA002625070A
Other languages
French (fr)
Inventor
Kristian Balschmidt Godsk
Thomas S. Bjertrup Nielsen
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.)
Vestas Wind Systems AS
Original Assignee
Vestas Wind Systems AS
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
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Application filed by Vestas Wind Systems AS filed Critical Vestas Wind Systems AS
Publication of CA2625070A1 publication Critical patent/CA2625070A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • 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
    • F03D1/0641—Rotors characterised by their aerodynamic shape of the blades of the section profile of the blades, i.e. aerofoil profile
    • 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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties 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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/024—Adjusting aerodynamic properties of the blades of individual 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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04—Automatic control; Regulation
    • F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
    • F03D7/043—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic
    • 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
    • F05B2240/301—Cross-section characteristics
    • 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
    • F05B2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape
    • F05B2240/311—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape flexible or elastic
    • 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
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/32—Wind speeds
    • 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

Abstract

A wind turbine blade comprising an active elastic member arranged with access to the surface of the wind turbine blade is provided. The active elastic member is deformable from a first shape to a second shape and the lift coefficient of the airfoil with the active elastic member in the first shape is larger than the lift coefficient of the airfoil with the active elastic member in the second shape. Furthermore, a wind turbine comprising such a wind turbine blade and a method of operating a wind turbine comprising such a wind turbine blade are provided.

Claims (63)

  1. CLAIM 1 1. A wind turbine blade having a suction side and a pressure side, which sides are connected at a loading edge and a trailing edge, the blade further comprising an active elastic member arranged with access to tho surface of the wind turbine blade, wherein the active elastic member is deformable from a first shape to a second shape, and the maximum lift coefficient, C L.max 1 of an airfoil with the active elastic member in the first shape is larger than the maximum lift coefficient, C L.max 2, of the airfoil with the active elastic member in the second shape, where said active elastic member is arranged so that the thickness of the blade changes upon deformation of the active elastic member in such a manner that the chamber line is shifted relative to tho cord line, characterised in that said active elastic member is arranged with access to the pressure side of an airfoil of the blade, preferably the active elastic member is arranged on the pressure side of the airfoil of the blade.

    1. A wind turbine blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, the blade further comprising an active elastic member arranged with access to the surface of the wind turbine blade, wherein the active elastic member is deformable from a first shape to a second shape, and the maximum lift coefficient, C L.max 1, of an airfoil with the active elastic member in the first shape is larger than the maximum lift coefficient, C L.max 2, of the airfoil with the active elastic member in the second shape.
  2. 2. Wind turbine blade according to claim 1, wherein the active elastic member is arranged with access to the pressure side of an airfoil of the blade, preferably the active elastic member is arranged on the pressure side of the airfoil of the blade.
  3. 3. Wind turbine blade according to claim 1 or 2, wherein the active elastic member is arranged in an area between the trailing edge and about 40% of the chord length from the leading edge, preferably the active elastic member is arranged in an area between the trailing edge and about 50% of the chord length from the leading edge.
  4. 4. Wind turbine blade according to claim 2 or 3, wherein the active elastic member for the airfoil is arranged from about 50 - 70% of the chord, preferably from about 55 - 65% of the chord, such as about 60% of the chord, and to about 80 - 90% of the chord, preferably to about 90 - 98% of the chord, such as about 95% of the chord.
  5. 5.. Wind turbine blade according to any one of the claims 1 to 4, wherein said active elastic member is arranged in the outermost 50 radius-% of the blade;
    preferably the active elastic member is arranged in the outermost 25 radius-%
    of the blade.
  6. 6. Wind turbine blade according claim 1 or 5, wherein said active elastic member is arranged in an area between maximum thickness of the airfoil of the blade and the trailing edge.
  7. 7. Wind turbine blade according to any one of the claims 1 to 6, further comprising an anemometer arranged near the tip of the blade, said anemometer being functionally connected to a control unit capable of controlling the shape of the active elastic member, preferably the anemometer being a laser anemometer or a pitot tube.
  8. 8. Wind turbine blade according to any one of the claims 1 to 6, further comprising a blade tension means arranged in the blade to establish the tension of the blade, said blade tension means being functionally connected to a control unit capable of controlling the shape of the active elastic member, preferably the blade tension means being a strain gauge arranged in a blade wall or a spar of the blade, or a means comprising an optical or conducting fibre.
  9. 9. Wind turbine blade according to any one of the claims 1 to 7, comprising a plurality of active elastic members arranged at the pressure side of the blade, preferably 2, 3, 4, 5, 6, 7, 8, 9, 10 or more active elastic members, more preferably a majority of the active elastic members are arranged in an area between maximum thickness of airfoils of the blade and the trailing edge.
  10. 10. Wind turbine blade according to claim 9, further comprising a number of anemometers distributed lengthwise along the blade, wherein each of said number of anemometers is arranged near a different one of said plurality of active elastic members, and said number of anemometers being functionally connected to a control unit capable of controlling the shape of said plurality of active elastic members individually, preferably the anemometer being a laser anemometer or a pitot tube.
  11. 11. Wind turbine blade according to claim 9 or 10, wherein at least one of the plurality of active elastic members extends 2 to 30 meters in the length of the blade, preferably 5 to 20 meters; more preferably at least two of the plurality of active elastic members extend 8 to 15 meters in the length of the blade.
  12. 12. Wind turbine blade according to any one of the claims 9 to 11, wherein at least one of the plurality of active elastic members extends 3% to 50% of the length of the wind turbine blade, preferably 5% to 40% of the length of the wind turbine blade; more preferably at least two of the plurality of active elastic members extend 10% to 25% of the length of the wind turbine blade.
  13. 13. Wind turbine blade according to claim 9 or 11, wherein at least two of the plurality of active elastic members are arranged substantially end to end so that a first active elastic member extends from a second active elastic member in the length of the blade.
  14. 14. Wind turbine blade according to any one of the claims 9 to 13, wherein at least two of the plurality of active elastic members are arranged side by side so that a first active elastic member extends from the second active elastic member substantially orthogonal to the length of the blade.
  15. 15. Wind turbine blade according to any one of the claims 9 to 14, wherein at least two of the plurality of active elastic members are arranged at least partially overlapping in the length of the blade and/or substantially orthogonal to the length of the blade.
  16. 16. Wind turbine blade according to any one of the claims 9 to 15, further comprising means to control the shape of the active elastic members individually.
  17. 17. Wind turbine blade according to any one of the claims 1 to 16, wherein second shape of the active elastic member is a relaxed state of the active elastic member.
  18. 18. Wind turbine blade according to any one of the claims 1 to 17, wherein the maximum lift coefficient, C L.max 1. of the airfoil with the active elastic member in the first shape is at least 10% larger than the maximum lift coefficient, C
    L.max 2. Of the airfoil with the active elastic member in the second shape, preferably the maximum lift coefficient, C L.max 1. of the airfoil with the active elastic member in the first shape is at least 15% larger than the maximum lift coefficient, C
    L.max 2, of the airfoil with the active elastic member in the second shape, more preferably the maximum lift coefficient, cL.max ,, of the airfoil with the active elastic member in the first shape is at least 20% larger than the maximum lift coefficient, CL.max Z, of the airfoil with the active elastic member in the second shape.
  19. 19. Wind turbine blade according to any one of the claims 1 to 18, wherein the difference in the lift coefficient for the airfoil with the active elastic member in the first shape and the second shape, AcL, should be larger than 10% of the largest of the lift coefficients at an angle of attack for all angles of attack between a = amax - 5 to amax, preferably, ACL > 20% of the largest of the lift coefficients at the angle of attack for all angles of attack between a = amax -to amax, such as ACL > 25% or even AcL, > 50%, more preferably the range of a, for which ACL should be above the defined value, is a= 0 to amax +2 , and even more preferably the range of a, for which cL should be above the defined value, is a=-2 to amax +8 ; where amax is the angle of attack corresponding to the maximum lift coefficient.
  20. 20. Wind turbine blade according to any one of the claims 1.to 19, wherein the maximum lift coefficient of the airfoil with the active elastic member in the first shape, CL.max.1, is larger than 1.2 andlor the maximum lift coefficient of the airfoil with the active elastic member in the second shape, CL,max,z, is below 1.0, where the maximum lift coefficient corresponds to Re in the range 1 - 10 millions and a two-dimensional flow passing a smooth profile surface; preferably cL,max.i is larger than 1.25 and/or cL.max,z is below 0.9, where the maximum lift coefficients correspond to Re in the range 1 - 10 millions and a two-dimensional flow passing a smooth profile surface.
  21. 21. Wind turbine blade according to any one of the claims 1 to 20, wherein the chamber of the airfoil with the active elastic member in the first shape differs from the chamber of the airfoil with the active elastic member in the second shape, and the difference in chamber is a distance of at least 0.25% chord orthogonal to the chord line for a part of the airfoil corresponding to at least 10% of the chord line;
    preferably the difference in chamber is a distance of at least 0.25% chord orthogonal to the chord line for a part of the airfoil corresponding to at least 15% of the chord line;
    more preferably the difference in chamber is a distance of at least 0.30%
    chord orthogonal to the chord line for a part of the airfoil corresponding to at least 10% of the chord line; and most preferably the difference in chamber is a distance of at least 030% chord orthogonal to the chord line for a part of the airfoil corresponding to at least 15% of the chord line
  22. 22. Wind turbine blade according to any one of the claims 1 to 21, wherein the chamber line of the airfoil with the active elastic member in the first shape deviates by at least 1.5% of the chord length orthogonally from the chord line of the airfoil with the active elastic member in the first shape in at least 10%
    of the range between the leading edge and the trailing edge; preferably in at least 20% of the range between the leading edge and the trailing edge, such as in at least 30% of the range between the leading edge and the trailing edge;
    more preferably the chamber line of the airfoil with the active elastic member in the first shape deviates by at least 3% of the chord length orthogonally from the chord line of the airfoil with the active elastic member in the first shape in at least 10% of the range between the leading edge and the trailing edge;
    preferably in at least 20% of the range between the leading edge and the trailing edge, such as in at least 30% of the range between the leading edge and the trailing edge.
  23. 23. Wind turbine blade according to any one of the claims 1 to 21; wherein the active elastic member comprises a compartment for receiving a fluid.
  24. 24. Wind turbine blade according to any one of the claims 1 to 23, wherein the active elastic member in combination with a rigid part of the wind turbine blade forms a compartment for receiving a fluid.
  25. 25. Wind turbine blade according to claim 23 or 24, further comprising a receive valve for controlling transport of fluid to said compartment, said receive valve being arranged near the compartment to be controlled and said receive valve being functionally connected to said compartment.
  26. 26. Wind turbine blade according to claim 25, wherein the receive valve is arranged near an end of the compartment towards the root of the blade,
  27. 27. Wind turbine blade according to any one of the claims 23 to 26, further comprising a release valve for controlling transport of fluid from said compartment, said release valve being arranged near the compartment to be controlled and said release valve being functionally connected to said compartment.
  28. 28. Wind turbine blade according to claim 27, wherein the release valve is arranged near an end of the compartment towards the tip of the blade.
  29. 29. Wind turbine blade according to claim 27 or 28, wherein the release valve is arranged to release the fluid to a surface of the wind turbine blade..
  30. 30, Wind turbine blade according to any one of the claims 23 to 29, further comprising a sensing means, such as a pressure gauge or a flow meter, the sensing means being functionally connected to the compartment and said sensing means being capable of establishing a volume of fluid in the compartment e.g. via the pressure of the fluid in the compartment or the flow of fluid to and/or from the compartment.
  31. 31. Wind turbine blade according to any one of the claims 23 to 30, further comprising a fluid distribution system in communication with the compartment, preferably via said receive valve and/or said release valve.
  32. 32. Wind turbine blade according to claim 31 further comprising a means for transporting the fluid, said means being in communication with the fluid distribution system.
  33. 33, Wind turbine blade according to any one of the claims 23 to 30, wherein the fluid is a gas.
  34. 34. Wind turbine blade according to any one of the claims 1 to 33, further comprising a flap arranged near the trailing edge of the airfoil; said flap being active in the sense that it is actuatable by an actuator means between a first position and a second position; the maximum lift coefficient of the airfoil with the flap in the first position is larger than the maximum lift coefficient of the airfoil with the flap in the second position.
  35. 35. Wind turbine blade according to claim 34, wherein the flap extends from between 80 to 90% of the chord length from the leading edge to the trailing edge, preferably the flap extends from between about 85% of the chord length from the leading edge to the trailing edge.
  36. 36. Wind turbine blade according to claim 34 or 35, wherein the second position of the flap is towards the suction side of the airfoil as compared to the first position of the flap, and the second position of the flap is a relaxed state of the flap.
  37. 37, Wind turbine blade according to any one of the claims 34 to 36, comprising a plurality of flaps arranged near the trailing edge of the blade, preferably 2, 3, 4, 5, 6, 7, 8, 9, 10 or more flaps arranged near the trailing edge.
  38. 38. Wind turbine blade according to claim 37, wherein at least one of the plurality of flaps extends 2 to 20 meters in the length of the blade, preferably 5 to 15 meters; more preferably at least two of the plurality of active elastic members extend 5 to 15 meters in the length of the blade.
  39. 39. Wind turbine blade according to claim 37 or 38, wherein at least one of the plurality of flaps extends 3% to 50% of the length of the wind turbine blade, preferably 5% to 40% of the length of the wind turbine blade; more preferably at least two of the plurality of flaps extend 10% to 25% of the length of the wind turbine blade.
  40. 40. Wind turbine blade according to claims 37 to 39, wherein the plurality of flaps are arranged one extending another in the length direction of the blade and an elastic connector is arranged between adjacent flaps so that flaps form a continuous surface free from steps in the longitudinal direction of the blade.
  41. 41 41. Wind turbine blade according to any one of the claims 34 to 40, wherein the actuator means is actuatable by a fluid, preferably by the same fluid as the active elastic members.
  42. 42. Wind turbine blade according to claim 41, wherein the actuator means is functionally connected to the fluid distribution system, which fluid distribution system is in communication with the active elastic member.
  43. 43. Subunit for installation on a wind turbine blade, which wind turbine blade has a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge to form a rigid blade surface, said subunit comprising an active elastic member adapted with regard to shape and size to being connected to a rigid surface part of a wind turbine blade, so that during operation of a wind turbine comprising said wind turbine blade with said subunit, said active elastic member is deformable from a first shape to a second shape, and the maximum lift coefficient of the combined structure of the subunit and the wind turbine blade in the first shape, C L.max 1, is larger than the maximum lift coefficient of the combined structure of the subunit and the wind turbine blade with the active elastic member in the second shape, C L.max 2.
  44. 44. Method of operating a wind turbine having a wind turbine blade according to any one of the claims 1 to 42, comprising the steps of establishing the incoming wind speed, preferably via an anemometer arranged on the wind turbine blade, and if the incoming wind speed is below a first threshold value, such as 10 m/s, then to deform an active elastic member from the second shape to the first shape so that the lift of the airfoil at the active elastic member is increased.
  45. 45. Method according to claim 44, further comprising the step to - if the incoming wind speed is below a second threshold value - actuate the flap from the second position to the first position so that the lift of the airfoil at the flap is increased, preferably the second threshold value is larger than the first threshold value such as 15 m/s.
  46. 46, Method of operating a wind turbine having a wind turbine blade according to any one of the claims 1 to 42, comprising the steps of establishing the tension of the wind turbine blade, preferably via a blade tension means arranged in the wind turbine blade, and if the tension is below a first threshold value, then to deform the active elastic member from the second shape to the first shape so that the lift of the airfoil at the active elastic member is increased.
  47. 47. Method of operating a wind turbine having a wind turbine blade according to any one of the claims 1 to 42, comprising the steps of establishing the rate of change of tension of the wind turbine blade, preferably via a blade tension means arranged in the wind turbine blade, and if the tension increases faster than a first threshold value, to deform the active elastic member from the first shape to the second shape so that the lift of the airfoil at the active elastic member is decreased.
  48. 48. Method according to claim 46, further comprising the step of - if the tension wind speed is below a second threshold value - actuating the flap from the second position to the first position so that the lift of the airfoil at the flap is increased.
  49. 49. Method according to any one of the claims 44 to 48, wherein the wind turbine is pitch-regulated and further comprising the step of adjusting the overall pitch angle of the blades according to the established wind speed and/or tension.
  50. 50. Method according to any one of the claims 44 to 49, wherein the wind turbine blade comprises at least two active elastic members arranged at different distances from the blade root, and at least two of the active elastic members are independently deformable, said method comprising the steps of for each active elastic member establishing the incoming wind speed at said active elastic member, and if the incoming wind speed is below a local threshold value for that active elastic member, such as 10 m/s then to deform said active elastic member from the second shape to the first shape so that the lift of the airfoil at said active elastic member is increased.
  51. 51. Method according to any one of the claims 44 to 50, wherein parameters, such as the threshold values, for regulation of the operation of the wind turbine are optimized so that during operation, the wind turbine will produce maximum energy output within an acceptable level of wear of the wind turbine.
  52. 52. Method according to any one of the claims 44 to 51, wherein parameters, such as the threshold values, for regulation of the operation of the wind turbine is optimized so that during operation the wind turbine will produce maximum energy output within an acceptable level of acoustic emission of the wind turbine.
  53. 53. Method according to any one of the claims 44 to 52, wherein the adjusting of the shape of the individual active elastic members is repeated with a frequency of less than about 0.1 Hz, preferably the adjusting of the shape of the individual active elastic members is repeated with a frequency of less than about 0.01 Hz.
  54. 54. Method according to any one of the claims 44 to 52, wherein the adjusting of the shape of the individual active elastic members is repeated with a frequency of more than 10Hz, preferably with a frequency of more than 20Hz, and more preferably with a frequency of more than 40Hz.
  55. 55. Method according to claims 44 to 54, wherein the adjusting of the shape of the individual active elastic members is repeated with a frequency corresponding to less than an 8 th of a rotation of the blade about the rotation axis, preferably with a frequency corresponding to less than a 16th of a rotation of the blade about the rotation axis, and more preferably with a frequency corresponding to less than a 40th of a rotation of the blade about the rotation axis.
  56. 56. Method according to claim 44 or 54, wherein the regulation is cyclic so that the period of the regulation corresponds to one rotation of the wind turbine rotor.
  57. 57, Method according to any one of the claims 44 to 56, further comprising the step of adjusting the individual pitch of the blade cyclic.
  58. 58. Method according to any one of the claims 44 to 57, wherein the shape of at least one active elastic member or flap is adjusted stepwise so that the active elastic member is either in the first shape or in the second shape.
  59. 59. Method according to any one of the claims 44 to 57, wherein the shape of at least one active elastic member or flap is adjusted substantially continuously so that the active elastic member may be deformed to several steps, such as 3, 4, 5, 6, 7, 8 steps or continuously without any steps between the shape providing the smallest maximum lift coefficient and the shape providing the largest maximum lift coefficient.
  60. 60. Method of operating a wind turbine having a wind turbine blade according to any one of the claims 1 to 42, said wind turbine blade comprising a plurality of active elastic member and/or a plurality of flaps, the method comprising the steps of establishing at least one of incoming wind speed, noise emission, strain of blade; establishing a desired configuration of a plurality of the active elastic member(s) and/or flap(s) of the blade based on artificial intelligence;
    and adjusting the active elastic member(s) and flap(s) accordingly, preferably the steps of the operation method are repeated at a frequency corresponding to at least 8 times a rotation frequency of the wind turbine blade.
  61. 61., Use of wind turbine blade according to any one of the claims 9 to 42 for a wind turbine operable by individual radius dependent variation of the airfoil section.
  62. 62. A wind turbine comprising at least one wind turbine blade according to any one of the claims 1 to 42.
  63. 63. Wind turbine according to claim 62, further comprising an anemometer arranged on a hub of the wind turbine, said anemometer being functionally connected to a control unit capable of controlling the shape of an active elastic member of said at least one wind turbine blade, preferably the anemometer being a laser anemometer arranged at a non-horizontal angle and being capable of measuring the incoming wind speed in various distances from the laser anemometer so that the wind speed in a plurality of vertical levels in front of the wind turbine blade(s) may be established during use.
CA002625070A 2005-10-17 2005-10-17 Wind turbine blade with variable aerodynamic profile Pending CA2625070A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2005/053397 WO2007045940A1 (en) 2005-10-17 2005-10-17 Wind turbine blade with variable aerodynamic profile

Publications (1)

Publication Number Publication Date
CA2625070A1 true CA2625070A1 (en) 2007-04-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA002625070A Pending CA2625070A1 (en) 2005-10-17 2005-10-17 Wind turbine blade with variable aerodynamic profile

Country Status (7)

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US (1) US8157533B2 (en)
EP (1) EP1952015B1 (en)
CN (1) CN101351640B (en)
CA (1) CA2625070A1 (en)
DK (1) DK1952015T3 (en)
ES (1) ES2418368T3 (en)
WO (1) WO2007045940A1 (en)

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CN101454564B (en) * 2006-04-02 2014-04-23 考特能源有限公司 Wind turbine with slender blade
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