WO2014127923A1 - Pale d'éolienne possédant une âme de longeron torsadée - Google Patents

Pale d'éolienne possédant une âme de longeron torsadée Download PDF

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Publication number
WO2014127923A1
WO2014127923A1 PCT/EP2014/050487 EP2014050487W WO2014127923A1 WO 2014127923 A1 WO2014127923 A1 WO 2014127923A1 EP 2014050487 W EP2014050487 W EP 2014050487W WO 2014127923 A1 WO2014127923 A1 WO 2014127923A1
Authority
WO
WIPO (PCT)
Prior art keywords
spar
blade
spar web
web
wind turbine
Prior art date
Application number
PCT/EP2014/050487
Other languages
English (en)
Inventor
Karsten Schibsbye
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP14701312.2A priority Critical patent/EP2932092A1/fr
Priority to CN201480009519.4A priority patent/CN105074201A/zh
Publication of WO2014127923A1 publication Critical patent/WO2014127923A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • 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
    • 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
    • F05B2250/00—Geometry
    • F05B2250/70—Shape
    • F05B2250/71—Shape curved
    • 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

  • the present invention relates to wind turbine blades.
  • the present invention relates to a wind turbine blade that allows for an increased resistance to flap deflection without adding weight or increasing torsional rigidity.
  • Wind turbines include wind turbine blades that are secured to a rotor hub.
  • the blades and rotor rotate about an axis of rotation and drive a rotor shaft.
  • the rotor shaft drives a generator arrangement disposed in a nacelle located adjacent to the rotor hub.
  • the generator arrangement and nacelle are disposed atop a support tower.
  • a linear velocity for any given radial location is determined by the formula where r is a radius and ⁇ is a rotational velocity.
  • ⁇ is a rotational velocity.
  • each radial location of the blade will be referred to as a radial point, and the radial point refers to a center of a cross section of the blade at the radial location.
  • the wind turbine operates within environmental wind that with an environmental wind vector.
  • the environmental wind vector may be parallel to the axis of rotation of the wind turbine, making it perpendicular to a plane of rotation for any point on the blade. Consequently, each point of the blade encounters environmental wind and rotational relative wind.
  • a relative wind which is a sum of the vectors of the environmental wind and the rotational relative wind.
  • An environmental wind vector may be the same at the base and at the tip of the blade, and it may be perpendicular to the plane of rotation. However, a vector of the rotational relative wind increases in magnitude from the base to the tip of the blade, while the direction is parallel to the plane of rotation.
  • the relative wind vector for each point changes from being closer to perpendicular to the plane of rotation at the base of the blade to being closer to parallel to the plane of rotation at the tip of the blade.
  • the change in orientation may be up to 30 degrees, depending on the blade design. Changes in orientation up to 45 degrees are currently envisioned.
  • the twisted web disclosed herein can accommodate any amount of change in orientation.
  • Wind turbine blades use forces created by the relative wind to drive the rotation of the blade about the rotor hub. As the relative wind reaches the blade some of it encounters a pressure side of the blade to create a pressure side aerodynamic force that can be seen as acting normal to the pressure side of the blade. Some of the relative wind is directed around the blade along a suction side. This suction side relative wind travels faster than the pressure side relative wind, and this velocity difference creates a suction side aerodynamic force that can be seen as acting normal to the suction side of the blade.
  • the pressure side aerodynamic force and the suction side aerodynamic force each have a force component parallel to the plane of rotation (a rotational component) and a force component perpendicular to the plane of rotation.
  • certain blade designs incorporate a structural spar.
  • the spas is shaped similar to an l-bean, and may have a pressure side spar cap, a suction side spar cap, and a spar web securing and holding the spar caps in a spaced apart relationship.
  • the spar adds strength and rigidity, but also adds weight to the blade.
  • a spar is installed in a blade from base to tip, and at all locations from the base to the tip the spar web maintains a same angle with the plane of rotation. In other words, the spar is a planar member.
  • weight and stiffness are of growing concern. Consequently, there remains room in the art for improvement.
  • a wind turbine blade having a unique structural spar has a spar web that twists within the blade, from a base of the blade to a tip of the blade.
  • an orientation of the web can be selected as an independent design variable for the first time.
  • the orientation of the spar web may be selected in a manner that best resists deflection of the blade induced by aerodynamic forces acting at that given location.
  • rotational forces within the plane of rotation
  • deflection forces toward the tower, perpendicular to the plane of rotation
  • the spar can be oriented nearly parallel to the direction of rotation to resist rotational forces, and at the tip of the blade it can be oriented nearly perpendicular to the plane of rotation to resist tower deflection.
  • the structural spar may be made lighter.
  • the lighter structural spar may have lighter spar caps. Lighter spar caps allows for increased torsional flexibility which decouples the tower stiffness from a twist stiffness. Therefore, for the given blade, the present invention would allow for a comparable stiff blade that would have a lighter spar, and reduced torsional rigidity.
  • the reduced torsional rigidity would allow the blade to torsionally flex (twist) in relatively strong winds. Such a characteristic is desirable as it allows the blade to become aeroelastic.
  • the twist of an aeroelastic blade during high winds allows it to decrease an angle of attack of the blade with respect to the relative wind, and this reduces transient stresses on the blade.
  • FIG. 1 is a perspective view of a schematic representation of a turbine blade.
  • FIG. 2 is a side view of the turbine blade of FIG. 1 .
  • FIG. 3 is a radial cross section of a prior art blade showing a spar web.
  • FIG. 4 is a radial cross section of the prior art spar blade of FIG. 3 taken at a cross-section closer to the blade tip that the cross section of FIG. 3.
  • FIG. 5 is a radial cross section of an exemplary embodiment of the spar web disclosed herein, taken along line A-A of the blade of FIG. 1 .
  • FIG. 6 is a radial cross section of an exemplary embodiment of the spar web disclosed herein, taken along line B-B of the blade of FIG. 1 .
  • FIG. 7 is a radial cross section of an alternate exemplary embodiment of the spar web disclosed herein, taken along line A-A of the blade of FIG. 1 .
  • FIG. 8 is a radial cross section of an alternate exemplary embodiment of the spar web disclosed herein, taken along line B-B of the blade of FIG. 1 .
  • FIG. 9 is a radial cross section of another alternate exemplary embodiment of the spar web disclosed herein, taken along line B-B of the blade of FIG. 1 .
  • the present inventor has recognized that blade design has evolved from designing blades of sufficient strength to designing blades of stiffness sufficient to prevent the blade from colliding with the tower support.
  • the present inventor has also recognized that local forces change from a base of the blade to a tip of the blade. In particular, at the base of the blade rotational forces (within a plane of rotation) have "accumulated" from the tip to the blade to the base, while tower deflection forces (toward the tower) are negligible.
  • a skin of the blade is very robust at the blade and can withstand the deflection forces itself, but may need the assistance of a structural spar to handle the rotational forces.
  • Blade rigidity comes primarily from the structural spar incorporated into the blade.
  • the present inventor has devised a unique way to orient the spar by twisting it in a radial direction so that it may be aligned with local forces that would induce deflection. Specifically, at the base the web would be oriented nearly parallel to the plane of rotation in order to resist rotational forces, and at the tip it would be oriented nearly perpendicular to the plane of rotation to resist tower deflection. This allows for a structural spar of reduced strength and weight, because a greater percentage of its existing strength is being used in each radial location. However, since structural spars have evolved to be stronger than needed, (as opposed to stiffer), the proposed structural spar of reduced strength and weight will be sufficient. The reduced strength and weight allow for greater torsional flexibility (twisting), and thus the blade may have superior aeroelastic properties, including aeroelastic deformation (twist) during high wind loading.
  • FIG. 1 discloses a blade 10 of a wind turbine.
  • a base 12 of the blade 10 is secured to a rotor hub 14.
  • the rotor hub 14 is secured to a rotor shaft 16 that leads to a power generation system (not shown) disposed inside a nacelle 18, that sits atop a support tower (not shown).
  • a leading edge 30 (indicated by a dotted line) of the blade 10 spans from the base 12 to a tip 32. It can be seen that the blade twists such that at the base 12 the leading edge 30 is oriented almost directly into environmental wind traveling in an environmental wind vector 34. Toward the tip 32 the leading edge 30 turns such that it is pointed nearly perpendicular to the environmental wind vector 34.
  • the twist rotates in a clockwise direction 36.
  • the blade 10 rotates in a clockwise direction of blade rotation 38 about an axis of rotation 40. Any given point on the blade 10 therefore defines a respective plane of rotation (not shown).
  • the blade has a pressure side 42 and a suction side 44.
  • FIG. 2 shows a side view of the blade 10 of FIG. 1 .
  • the blade 10 rotates in a direction of blade rotation 38 shown as an arrow head. In this view the direction of blade rotation 38 is out of the page.
  • a cross section of each radial location will be modeled as a point in a center of a respective cross section throughout this disclosure.
  • each radial point moves in a respective plane of rotation. If the blade 10 rotates and no aerodynamic forces are generated, each point rotates about a respective no-load plane of rotation. When there is environmental wind, however, the blade deflects due to aerodynamic loads. The deflection of any given point may be in any direction.
  • a tower deflection 50 of the tip 32 from a no-load plane of rotation 52 to a load plane of deflection 54, which is closer to the support tower 56, is of direct concern.
  • the twisted spar web disclosed herein directly addresses this tower deflection 50.
  • FIG. 3 is a cross section of a prior art turbine blade similar to that of FIG. 1 taken near the base the blade looking radially outward from the rotor hub (not shown) showing a prior art structural spar 70 having a spar web 72, a pressure side spar cap 74 disposed in the pressure side 44, and a suction side spar cap 76 disposed in the suction side 46.
  • the leading edge 30 of the blade is oriented almost directly into the environmental wind vector 34.
  • the base is moving in the direction of blade rotation.
  • Each cross section has a center 78 that rotates within a respective plane of rotation 80.
  • the spar web 72 forms a first angle 82 with the plane of rotation 80.
  • the cross section center 78 experiences the influences of the environmental wind vector 34 and a rotational relative wind vector 90 that is parallel to the respective plane of rotation 80. These vectors combine to form an effective wind for the given center 78 known as the relative wind having a relative wind vector 92.
  • the relative wind vector 92 is simply the sum of the environmental wind vector 34 and the rotational relative wind vector 90.
  • the pressure side aerodynamic force vector 100 and the suction side aerodynamic force vector 102 may or may not be parallel to each other.
  • a net aerodynamic force vector 106 acting on the center 78 is a sum of the pressure side aerodynamic force vector 100 and the suction side aerodynamic force vector 102.
  • the net aerodynamic force vector 106 forms a net force angle 108 with the plane of rotation 80, and therefore the net aerodynamic force vector 106 has a net aerodynamic force tower component 1 10 perpendicular to the plane of rotation 80, which is toward the support tower (not shown), and a net aerodynamic force in-plane component 1 12 that is parallel to the plane of rotation 80. It can be seen that the net aerodynamic force in-plane component 1 12 is much greater than the net aerodynamic force tower component 1 10 at the base 12.
  • a shell 1 14 of the base 12 is also more substantial structurally. Consequently, at the base 12 the resistance to the net aerodynamic force in-plane component 1 12 is of high importance, while tower deflection 50 is of little concern.
  • FIG. 4 is a cross section close to the tip of the blade of FIG. 3 looking radially outward from the rotor hub (not shown) showing a prior art structural spar 70 having a spar web 72, a pressure side spar cap 74 disposed in the pressure side 44, and a suction side spar cap 76 disposed in the suction side 46.
  • the leading edge 30 of the blade 10 at the tip is oriented closer to perpendicular to the environmental wind vector 34.
  • the tip 32 is moving in the direction of blade rotation 38.
  • Each cross section has a center 78 that rotates within a respective plane of rotation 80.
  • the spar web 72 again forms the same first angle 82 with the plane of rotation 80. This occurs because the spar web 72 is planar.
  • the cross section center 78 of the tip 32 experiences the influences of the environmental wind vector 34 and a rotational relative wind vector 90 that is parallel to the respective plane of rotation 80. These vectors combine to form the relative wind vector 92.
  • the relative wind creates the pressure side aerodynamic force vector 100 and the suction side aerodynamic force vector 102.
  • the net aerodynamic force vector 106 acts on the center 78.
  • the net aerodynamic force vector 106 forms the net force angle 108 with the plane of rotation 80, and therefore the net aerodynamic force vector 106 has the net aerodynamic force tower component 1 10 and the net aerodynamic force in-plane component 1 12. It can be seen that the net aerodynamic force tower component 1 10 is much greater than the net aerodynamic force in-plane component 1 12 at the tip 32.
  • FIGS. 5-9 show an exemplary embodiment of the spar web disclosed herein that is tailored to provide strength as required by particular regions throughout the blade 10.
  • FIG. 5 is the same cross section as FIG. 3, but with a spar 120 disclosed herein, having a spar web 122, a pressure side spar cap 124 on the pressure side, and a suction side spar cap 126 on the suction side 46.
  • aerodynamic force vector 106 acts on the center 78.
  • the spar web 122 is parallel to the plane of rotation 80, and thus the first angle 82 is zero and the spar web 122 will offer maximum resistance to in-plane forces.
  • the spar web 122 as shown does not exactly align with the net aerodynamic force vector 106. Consequently, for the given net aerodynamic force vector 106 the spar web 122 may offer little resistance to tower deflection 50.
  • tower deflection 50 is such a small concern at the base 12, and since in-plane resistance is so important, this configuration may be a good match of the spar web's strength to the needs of the base 12 of the blade 10.
  • the first angle may be less than 45 degrees to most effectively resist deflection in the plane of rotation 80.
  • FIG. 6 is the same cross section as FIG. 4, with the spar 120 disclosed herein. Similar to the prior art, there is the net aerodynamic force vector 106 that acts on the center 78. However, unlike the prior art, the spar web 122 at the tip 32 forms a second angle 130 with the plane of rotation 80, where the second angle 130 is different than the first angle 82 at the base 12. In the exemplary embodiment shown the spar web 122 at the tip 32 does not exactly align with the net aerodynamic force vector 106 at the tip 32, but it is exactly perpendicular to the plane of rotation 80. Instead, the spar web 122 forms an alignment angle 132 with the net aerodynamic force vector 106 which may be within 45 degrees of the net aerodynamic force vector 106.
  • the spar web 122 may offer little resistance to in-plane force, but it will offer maximum resistance to tower deflection 50. Since tower deflection 50 is so importance at the tip 32, and in- plane resistance is such a small concern at the tip 32, this configuration may be a good match of the spar web's strength to the needs of the top 32 of the blade.
  • the second angle 130 may be greater than 45 degrees to most effectively resist deflection in the plane of rotation 80.
  • the spar web 122 at the base 12 may exactly align with the net aerodynamic force vector 106. This may provide maximum resistance to the net aerodynamic force vector 106, but may offer slightly less in-plane resistance.
  • the spar web 122 at the tip 32 may exactly align with the net aerodynamic force vector 106, such that the alignment angle 132 between the spar web 122 and the net aerodynamic force vector 106 is zero. This provides a maximum resistance to deflection induced by the net aerodynamic force vector 106 that has been designed for at that location. However, it may permit minimal tower deflection 50 should force vectors change. With the spar web 122 disclosed herein, a greater portion of the spar web's strength will still be applied locally as needed. This allows rigidity to be treated as in independent design factor, which has not previously occurred.
  • first angle 82 and/or the second angle 130 may be selected as a result of considering factors other than the local net aerodynamic force vector 106. In other words, a net bending force/moment on any given cross section may be
  • a local geometry of the blade cross section may require or suggest adjustments. For example, as shown in FIG. 9, the spar web 122 has been shifted closer to the leading edge 30. As a result of this shift, and the local blade geometry, an average length 140 of the spar web 122 between the pressure side spar cap 74 and the suction side spar cap 76 may be longer than if the spar web 122 were positioned as in FIG. 8, over the center 78.
  • the average length as used herein accounts for angled ends of the spar web 122 due to the angled spar caps.
  • an additional amount of strength gained by lengthening the spar web 122 may make up for a slight misalignment with whichever direction the spar web's 122 strength is needed.
  • the spar web 122 can be rotated so that it does not exactly align with the net aerodynamic force vector 106, or with whichever direction the spar web's 122 strength is needed, for the same reason.
  • a different second angle 130 may be used than the second angle 130 of FIG. 8.
  • Other forces may be considered not discussed herein but known to those of ordinary skill in the art.
  • Each cross section may be looked at and an orientation of the spar web 122 may be optimized for each cross section when all factors are considered.
  • One way to optimize the average length 140 of the spar web 122 may be to determine a tangent line 150 of the leading edge 30, and then draw a pressure side line 152 perpendicular (i.e. at a right angle) to the tangent line 150 and determine a pressure side tangent point 154 where the pressure side line 152 contacts the pressure side 44. Then drawing a suction side line 156 perpendicular to the tangent line 150 and determine a suction side tangent point 158 where the suction side line 156 contacts the suction side 46.
  • a suggested spar web line 160 connecting the pressure side tangent point 154 and the suction side tangent point 158 may reveal a spar web orientation that yields a greatest average length 140 of the spar web for that local blade geometry, and the greatest average length 40 may provide a desired design choice.
  • a resulting spar web 122 may twist at a smooth, constant rate from base to tip
  • smooth means not abrupt changes in twist direction, such as may occur if a spar web were cut into a radially inner piece and a radially outer piece, and one piece were rotated any amount, and then the two were rejoined.
  • the inventor has devised an innovative way to decouple the blades rigidity requirement, the strength requirement, and the torsional rigidity requirement from each other, by using a structural spar that can be twisted to accommodate local forces. Since the blade depends on the spar for to supply structural strength in different directions for different reasons at differing location, the twisted spar can be tailored to provide much more of its available strength exactly as needed for any given location within the blade. This permits a lighter spar for a given rigidity requirement, and this lighter spar still meets the blade's strength requirement, while permitting greater torsional flexibility. The greater torsional flexibility enables a more aeroelastic blade, and a more aeroelastic blade may have a longer service life. Consequently, this spar represents an improvement in the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)

Abstract

La présente invention concerne une pale d'éolienne torsadée radialement (10), comprenant une âme de longeron torsadée radialement (122), un centre (78) d'une coupe transversale radiale d'une base (12) de la pale tournant dans un plan de rotation (80) et, au niveau d'une base (12), une coupe transversale radiale de l'âme de longeron formant avec le plan de rotation un premier angle (82) et, au niveau d'un bout (32), une coupe transversale radiale de l'âme de longeron formant avec le plan de rotation un second angle (130) différent du premier angle.
PCT/EP2014/050487 2013-02-19 2014-01-13 Pale d'éolienne possédant une âme de longeron torsadée WO2014127923A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14701312.2A EP2932092A1 (fr) 2013-02-19 2014-01-13 Pale d'éolienne possédant une âme de longeron torsadée
CN201480009519.4A CN105074201A (zh) 2013-02-19 2014-01-13 具有扭曲的翼梁腹板的风力涡轮机叶片

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/769,952 2013-02-19
US13/769,952 US20140234115A1 (en) 2013-02-19 2013-02-19 Wind turbine blade having twisted spar web

Publications (1)

Publication Number Publication Date
WO2014127923A1 true WO2014127923A1 (fr) 2014-08-28

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Application Number Title Priority Date Filing Date
PCT/EP2014/050487 WO2014127923A1 (fr) 2013-02-19 2014-01-13 Pale d'éolienne possédant une âme de longeron torsadée

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Country Link
US (1) US20140234115A1 (fr)
EP (1) EP2932092A1 (fr)
CN (1) CN105074201A (fr)
WO (1) WO2014127923A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3892849A1 (fr) 2020-04-06 2021-10-13 Nordex Energy Spain, S.A.U. Pale de rotor d'éolienne dotée d'une bande de cisaillement

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CN112241573B (zh) * 2019-07-16 2022-10-18 内蒙古工业大学 一种风力机叶片的细观纤维铺角优化方法
US11261736B1 (en) * 2020-09-28 2022-03-01 Raytheon Technologies Corporation Vane having rib aligned with aerodynamic load vector

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DE10021430A1 (de) * 2000-05-03 2002-01-17 Olaf Frommann Adaptive Blattverstellung für Windenergierotoren
WO2008052677A2 (fr) * 2006-11-02 2008-05-08 Lignum Vitae Limited Aube de rotor d'éolienne et éolienne dotée d'une telle aube
DE102007036917A1 (de) * 2007-08-06 2009-02-12 Hafner, Edzard, Prof. Dr.-Ing. Rotorblatt für Windkraftanlagen, insbesondere für schwimmende Windkraftanlagen, sowie Windkraftanlage mit einem Rotorblatt
US20100143135A1 (en) * 2009-06-16 2010-06-10 General Electric Company Torsionally loadable wind turbine blade
US20110052408A1 (en) * 2009-08-25 2011-03-03 Zuteck Michael D Swept blades utilizing asymmetric double biased fabrics

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US20090196756A1 (en) * 2008-02-05 2009-08-06 General Electric Company Wind turbine blades and method for forming same
CN102066747A (zh) * 2008-06-23 2011-05-18 丹麦技术大学 具有成角度的梁的风力涡轮机叶片
FR2956856A1 (fr) * 2010-02-26 2011-09-02 Eurocopter France Pale a vrillage adaptatif, et rotor muni d'une telle pale
US8186964B2 (en) * 2010-12-10 2012-05-29 General Electric Company Spar assembly for a wind turbine rotor blade
ES2398553B1 (es) * 2011-02-24 2014-02-06 Gamesa Innovation & Technology S.L. Una pala de aerogenerador multi-panel mejorada.

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
DE10021430A1 (de) * 2000-05-03 2002-01-17 Olaf Frommann Adaptive Blattverstellung für Windenergierotoren
WO2008052677A2 (fr) * 2006-11-02 2008-05-08 Lignum Vitae Limited Aube de rotor d'éolienne et éolienne dotée d'une telle aube
DE102007036917A1 (de) * 2007-08-06 2009-02-12 Hafner, Edzard, Prof. Dr.-Ing. Rotorblatt für Windkraftanlagen, insbesondere für schwimmende Windkraftanlagen, sowie Windkraftanlage mit einem Rotorblatt
US20100143135A1 (en) * 2009-06-16 2010-06-10 General Electric Company Torsionally loadable wind turbine blade
US20110052408A1 (en) * 2009-08-25 2011-03-03 Zuteck Michael D Swept blades utilizing asymmetric double biased fabrics

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3892849A1 (fr) 2020-04-06 2021-10-13 Nordex Energy Spain, S.A.U. Pale de rotor d'éolienne dotée d'une bande de cisaillement
US11512678B2 (en) 2020-04-06 2022-11-29 Nordex Energy Spain S.A.U. Wind turbine rotor blade having a shear web

Also Published As

Publication number Publication date
EP2932092A1 (fr) 2015-10-21
US20140234115A1 (en) 2014-08-21
CN105074201A (zh) 2015-11-18

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