EP1292766A1 - Aile d'eolienne comportant un moyen de reduction du bruit - Google Patents

Aile d'eolienne comportant un moyen de reduction du bruit

Info

Publication number
EP1292766A1
EP1292766A1 EP01943176A EP01943176A EP1292766A1 EP 1292766 A1 EP1292766 A1 EP 1292766A1 EP 01943176 A EP01943176 A EP 01943176A EP 01943176 A EP01943176 A EP 01943176A EP 1292766 A1 EP1292766 A1 EP 1292766A1
Authority
EP
European Patent Office
Prior art keywords
wind turbine
wing
turbine wing
wing according
noise
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.)
Withdrawn
Application number
EP01943176A
Other languages
German (de)
English (en)
Inventor
Peter Nohr Larsen
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.)
LM Wind Power AS
Original Assignee
LM Glasfiber 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
Application filed by LM Glasfiber AS filed Critical LM Glasfiber AS
Priority to EP06003456A priority Critical patent/EP1662137A1/fr
Publication of EP1292766A1 publication Critical patent/EP1292766A1/fr
Withdrawn legal-status Critical Current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
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F01D5/145—Means for influencing boundary layers or secondary circulations
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/08—Boundary layer controls by influencing fluid flow by means of surface cavities, i.e. net fluid flow is null
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/14—Boundary layer controls achieving noise reductions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/24—Boundary layer controls by using passive resonance cavities, e.g. without transducers
    • 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
    • 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
    • F05B2240/306—Surface measures
    • F05B2240/3062—Vortex generators
    • 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
    • F05B2240/32—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor with roughened surface
    • 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
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/127—Vortex generators, turbulators, or the like, for mixing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor with roughened surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/10—Drag reduction
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • the invention concerns a wind turbine wing with noise reduction means, where the wing is a surface with an upper and a lower side interconnected at a trailing 5 edge and where one or several cavities are established between the upper and the lower sides.
  • the wind turbine wings produce a considerable amount of noise, which increases with the size and speed of the wing.
  • the noise may be due to two different types of sources, they are:
  • the first type of noise may be controlled by traditional means, like enclosure and vibration isolation of the noise sources. Since the control of this type of 5 noise sources is not the scope of the present invention, it will not be further discussed here.
  • the second type of noise may normally be separated into four independent contributions, namely: 0 a) Noise cause by turbulence in the air.
  • This noise type occurs close to the tip of the wing and over the whole length of the wing chord.
  • the noise is relatively low frequency with a dominating frequency range from about 100 Hz to about 500 Hz. 5 b) Noise from the turbulent boundary layer.
  • This noise type is created as a consequence of the passage of air over the wing surface.
  • the source is most powerful close to the trailing edge, where the thickness of the boundary layer is biggest and where, furthermore, the presence of the edge enhances the noise.
  • the noise is radiated in a frequency range from about 200 Hz to about 1000 Hz.
  • Noise from vortex shedding from the trailing edge of the wind turbine wing This noise is due to the creation of vortices in the transition area, where the wing surface ends in a more or less abrupt trailing edge.
  • the noise from this type of source is radiated in a relatively narrow frequency range depending on the local air velocity and the bluntness of the trailing edge.
  • the frequency range is typically from about 1000 Hz to about 1200 Hz.
  • the vortex Due to the lift on the wing a powerful rotation of the air - a vortex - is created where the wing ends at the tip.
  • the vortex is not in itself a powerful noise source, but when the vortex hits the trailing edge an interaction takes place that considerably enhances its ability to radiate noise.
  • the noise is radiated in a frequency range from about 800 Hz to about 2000 Hz.
  • the air velocity is a function of the wind speed and of the lo- cal velocity of rotation of the wing .
  • the radiated noise from wind turbines may not be neglected and may be annoying to people living in there vicinity, which again means that wind turbines must be placed away from residential areas.
  • DK 172218 B1 describes a design, where the trailing edge of a wind turbine wing is provided with a compliant extension for the purpose of reducing the noise from vortex shedding at the trailing. Hence, only the mere generation of noise is reduced. Noise already generated (i.e. noise generated at the trailing edge or elsewhere on the wing) is not reduced by this known technique.
  • EP 0 652 367 A1 describes a wind turbine wing with a saw-tooth formed trailing edge, for the purpose of reducing the noise generated at the trailing edge.
  • a trailing edge with a saw-tooth form causes the vortices formed here to be more irregular and hence the generated noise to be weaker, because the individual vortices are not able to enhance each other. Again, only the generation of noise is reduced. This technique will not reduce noise once it has been generated, neither at the trailing edge nor elsewhere on the wing.
  • DK B 172127 B1 shows a construction, where the internal cavity of the wing is filled with a noise absorbing material, but without any connection to the exterior of the wing.
  • the noise absorbing material damps standing waves in the wing cavity, but will not influence the reduction of flow noise on the exterior surface of the wing, due to the wing's generally low sound transmission.
  • DE 19738278 A1 describes a construction, with diffusers at the trailing edge.
  • noise reduction means are means for changing the sound reflection, and where said reduction means are established on part of the upper side, lower side, or trailing edge
  • the wing - as described in claim 2 - has an indentation for reception of the means for changing the sound reflection.
  • This indentation may be on the upper side, on the lower side or on the trailing edge.
  • A) As a sound absorbing material (claim 9). By this is understood a material that when exposed to a sound wave only reflects back a small part of the energy in the sound. The main part of the sound energy is absorbed (lost) in the material. An example of a material like that is mineral wool. Sound absorbing materials often damps over a wide frequency range, typically from 100 Hz to 10 kHz.
  • B) Resilient parts (claim 4), where the resilient part may be a resiliency mounted plate, which by the sound wave is forced to vibrate at a frequency close to the resonance frequency of the parts. In the frequency range close to the resonance frequencies of the parts, the vibrations of the parts will be opposite the excitation from the sound wave.
  • the radiate sound waves from the parts eliminate not only the exciting sound wave but also the sound source itself.
  • Resilient parts have an advantage: the may be optimised to reduce exactly a certain frequency range. Even low frequencies under 500 Hz may be reduced, using a system with small physical dimensions. By adding damping (internal loss) to the vibrating system the obtained noise reduction is weaker, but will cover a wider frequency range.
  • FIG. 1 is a part of a wind turbine wing with noise reducing means according to a first embodiment.
  • Fig. 2 is a part of a wind turbine wing with noise reducing means according to a second embodiment.
  • Fig. 3 is a part of a wind turbine wing with noise reducing means according to a third embodiment.
  • Fig. 4 is a part of a wind turbine wing with noise reducing means according to a fourth embodiment.
  • Fig. 5 is a part of a wind turbine wing with noise reducing means according to a fifth embodiment.
  • Fig. 6 is a part of a wind turbine wing with noise reducing means according to a sixth embodiment.
  • Fig. 7 is a construction detail of the embodiment shown in fig. 3.
  • Fig. 8 is a second construction detail of the embodiment shown in fig. 3.
  • Fig. 9 is a third construction detail of the embodiment shown in fig. 3.
  • Fig. 10 is a fourth construction detail of the embodiment shown in fig. 3.
  • Fig. 11 is a fifth construction detail of the embodiment shown in fig. 3.
  • the number 1 refers to the complete wing for a wind turbine shown cut through.
  • the wing 1 has an upper side 2 and a lower side 3, in the left hand side the two sides interconnect along a bended edge 4 and in the right hand side they end along a trailing edge 5. Between the upper side 2 and the lower side 3 is a cavity 6.
  • a first embodiment to establish noise reduction means is to change the acoustic reflection of the complete or parts of the upper side 2, the lower side 3, or the trailing edge 5.
  • Fig. 1 the number 7 refers to an example, where the acoustic properties of the upper part 2 has partially been changed by surface treatment.
  • wing is shown again, but this time with an indentation 8.
  • indentation By filling the indentation with a sound absorbing material and thereby a material for change of the sound reflection, the noise from the wing under operation may be reduced.
  • Fig. 3 is shown a third embodiment, where the wing on its upper side is provided with slits 14, 15, 18 and holes 13, 16 with connection to a plurality of cavities 10, 11 , 12 between the upper and lower sides of the wing.
  • the cavities may be established by putting up wall members, for example like 17.
  • the noise reduction properties may be tailored to selective reduction at different frequencies and levels.
  • Fig. 4 shows a variant of the embodiment according to Fig. 3, where a reso- nance-absorbing element 9 with slits 20 is placed in the indentation 8. Instead of slits 20, holes (not shown) could have been used alternatively in the element.
  • This embodiment is especially suited for manufacturing of wings in small quan- tities, since the wing may be built as a standard unit that may be adapted to the given acoustical conditions by means of a resonance-absorbing element. By having a separate element it may be manufacturer by a different and more optimal technique than the rest of the wing.
  • Fig. 5 shows an embodiment, where a compliant element is formed in the indentation on the wing.
  • the element consists of a compliant part 21, which on its upper side is provided with a surface 22 in the same material as the rest of the wing's 1 upper side.
  • FIG. 6 A variant of this embodiment is shown in Fig. 6, where the surface 22 is mounted on springs.
  • the narrow slit that arises between the compliant element and the wing may ideally be covered by a membrane or the like.
  • Fig. 7-11 are shown in more details how the holes 13, 16 may be designed.
  • the holes 13 have rounded edges at the exterior side of the wing. This is in order to avoid vortex shedding and hence noise from the flow across the hole.
  • Fig. 8 shows holes with abrupt edges, but here covered by an impermeable membrane 24. In this way, the hole will not have any negative influence what so ever on the flow over the wing. The mass and stiffness of the membrane must of cause be taken into account when the properties of the resonance- absorbing element are calculated.
  • Fig. 9 shows an embodiment, where the part of the hole 13 that faces the cavity of the wing (e.g. 12 in fig. 3) is covered by an air-permeable membrane 25.
  • This construction adds flow resistance to the system, and thereby the noise reduction of the resonance-absorbing element may be expanded in frequency.
  • Fig. 10 shows an embodiment, where the hole is filled with an air-permeable material 26. This is another way of adding flow loss to the system, and thereby - as explained earlier - expanding the frequency range of noise reduction.
  • Fig. 11 shows an embodiment, where the cavity is partially filled with a sound absorbing material 27. Again, this adds loss to the system and expands the frequency range of noise reduction.

Landscapes

  • 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)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention a pour objet un moyen de changer la réflexion acoustique d'une aile d'éolienne tournante afin de réduire le bruit inévitable créé par le flux d'air sur une partie de la surface de l'aile. Ce moyen de changer la réflexion acoustique peut être obtenu grâce à une échancrure pratiquée sur la face supérieure, réalisée au moyen d'un matériau absorbant le son, ou grâce à une plaque montée sur les parties appropriées. Une des possibilités consiste également à placer dans l'échancrure un élément absorbant la résonance. Une dernière possibilité consiste à pratiquer, sur la face supérieure, la face inférieure ou le bord arrière de l'aile, des ouvertures menant à une ou plusieurs cavités à l'intérieur de l'aile. Le moyen de changer la réflexion acoustique est intégré à l'aile, afin que le flux circulant autour de l'aile ne soit pas affecté et que le bruit, provenant des différentes sources de bruit, soit réduit de manière efficace.
EP01943176A 2000-06-20 2001-06-14 Aile d'eolienne comportant un moyen de reduction du bruit Withdrawn EP1292766A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06003456A EP1662137A1 (fr) 2000-06-20 2001-06-14 Aile d'éolienne comportant un moyen de réduction du bruit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK200000956A DK174319B1 (da) 2000-06-20 2000-06-20 Vindmøllevinge med støjdæmpningsmidler
DK200000956 2000-06-20
PCT/DK2001/000416 WO2001098653A1 (fr) 2000-06-20 2001-06-14 Aile d'eolienne comportant un moyen de reduction du bruit

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP06003456A Division EP1662137A1 (fr) 2000-06-20 2001-06-14 Aile d'éolienne comportant un moyen de réduction du bruit

Publications (1)

Publication Number Publication Date
EP1292766A1 true EP1292766A1 (fr) 2003-03-19

Family

ID=8159566

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06003456A Withdrawn EP1662137A1 (fr) 2000-06-20 2001-06-14 Aile d'éolienne comportant un moyen de réduction du bruit
EP01943176A Withdrawn EP1292766A1 (fr) 2000-06-20 2001-06-14 Aile d'eolienne comportant un moyen de reduction du bruit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06003456A Withdrawn EP1662137A1 (fr) 2000-06-20 2001-06-14 Aile d'éolienne comportant un moyen de réduction du bruit

Country Status (3)

Country Link
EP (2) EP1662137A1 (fr)
DK (1) DK174319B1 (fr)
WO (1) WO2001098653A1 (fr)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1607624A3 (fr) * 2004-06-15 2008-11-26 NORDEX ENERGY GmbH Pale pour éolienne
DE102005019905B4 (de) * 2005-04-29 2012-12-06 Nordex Energy Gmbh Rotorblatt für eine Windenergieanlage
DE102006028167A1 (de) * 2006-06-16 2007-12-20 Daubner & Stommel Gbr Bau-Werk-Planung Verfahren zum Betreiben einer zumindest einen fluiddynamischen Auftriebskörper aufweisenden Vorrichtung, insbesondere einer Windenergieanlage
CN101646865B (zh) 2006-12-15 2013-01-09 布拉德纳公司 加强的空气动力学型材
ES2496167T3 (es) 2007-01-16 2014-09-18 Bladena Aps Pala reforzada para aerogenerador
CN101589227B (zh) 2007-01-25 2014-11-26 布拉德纳公司 用于风力涡轮机的加强叶片
US7901189B2 (en) 2007-05-14 2011-03-08 General Electric Company Wind-turbine blade and method for reducing noise in wind turbine
US7607287B2 (en) 2007-05-29 2009-10-27 United Technologies Corporation Airfoil acoustic impedance control
ES2345583B1 (es) * 2007-05-31 2011-07-28 GAMESA INNOVATION & TECHNOLOGY, S.L. Pala de aerogenerador con dispositivos anti-ruido.
ES2333499B1 (es) * 2007-09-11 2010-10-15 Manuel Torres Martinez Pala para aerogenerador.
US8262363B2 (en) 2008-03-17 2012-09-11 General Electric Company Blade having a damping element and method of fabricating same
WO2009155920A1 (fr) * 2008-06-24 2009-12-30 Danmarks Tekniske Universitet Pale d'éolienne renforcée
US7988416B2 (en) * 2009-03-18 2011-08-02 Vestas Wind Systems A/S Wind turbine blade with damping element
EP2330294B1 (fr) 2009-12-02 2013-01-16 Bladena ApS Corps formé en surface portante renforcée
US8083488B2 (en) 2010-08-23 2011-12-27 General Electric Company Blade extension for rotor blade in wind turbine
US20130108457A1 (en) * 2011-10-28 2013-05-02 Carsten Thrue Wind turbine blade comprising a vortex-generator
FR2983907B1 (fr) * 2011-12-08 2015-05-22 Snecma Procede pour realiser un element de liaison dispose entre deux pieces d’une structure, element de liaison et turbomoteur a double flux comprenant un tel element de liaison.
DE102013201871C5 (de) 2013-02-05 2018-09-06 Senvion Gmbh Vortexgenerator für ein Rotorblatt einer Windenergieanlage
DE102013210737B4 (de) * 2013-06-10 2021-06-17 Senvion Gmbh Befestigung von Vortexgeneratoren
EP2851556A1 (fr) * 2013-09-18 2015-03-25 Siemens Aktiengesellschaft Agencement permettant de réduire le bruit d'une pale de rotor de turbine éolienne
JP5886475B2 (ja) * 2014-03-04 2016-03-16 中国電力株式会社 風力発電装置
DK3158188T3 (da) * 2014-06-18 2021-04-26 Siemens Gamesa Renewable Energy As Støjreduktionsindretning til en vindmøllevinge
FR3027623B1 (fr) * 2014-10-23 2021-05-28 Snecma Aube mobile de rotor a reponse acoustique reduite
WO2017044099A1 (fr) * 2015-09-10 2017-03-16 Siemens Aktiengesellschaft Cloison de décrochage réductrice de bruit pour pale d'éolienne
US10400744B2 (en) 2016-04-28 2019-09-03 General Electric Company Wind turbine blade with noise reducing micro boundary layer energizers
CN109808900A (zh) * 2019-03-04 2019-05-28 中国空气动力研究与发展中心低速空气动力研究所 一种用于翼身融合体背部发动机对地面噪声衍射抑制的结构
WO2022233815A1 (fr) * 2021-05-06 2022-11-10 Lm Wind Power A/S Pale d'éolienne à réduction du bruit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779338A (en) * 1972-01-27 1973-12-18 Bolt Beranek & Newman Method of reducing sound generation in fluid flow systems embodying foil structures and the like
US4189027A (en) * 1976-08-19 1980-02-19 United Technologies Corporation Sound suppressor liners
FR2540912A2 (fr) * 1982-06-02 1984-08-17 Uzan Daniel Dispositif absorbeur acoustique passif absorbant aussi les basses frequences
US4720239A (en) * 1982-10-22 1988-01-19 Owczarek Jerzy A Stator blades of turbomachines
JP3071287B2 (ja) * 1992-01-22 2000-07-31 松下電器産業株式会社 送風機羽根車
US5813625A (en) * 1996-10-09 1998-09-29 Mcdonnell Douglas Helicopter Company Active blowing system for rotorcraft vortex interaction noise reduction
DE19738278A1 (de) * 1997-09-02 1999-03-04 Felix Hafner Adaptiver Rotor für Windkraftanlagen
US6139259A (en) * 1998-10-29 2000-10-31 General Electric Company Low noise permeable airfoil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0198653A1 *

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EP1662137A1 (fr) 2006-05-31
DK174319B1 (da) 2002-12-02
WO2001098653A1 (fr) 2001-12-27
DK200000956A (da) 2001-12-21

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