US20150050154A1 - Airfoil trailing edge apparatus for noise reduction - Google Patents
Airfoil trailing edge apparatus for noise reduction Download PDFInfo
- Publication number
- US20150050154A1 US20150050154A1 US13/900,756 US201313900756A US2015050154A1 US 20150050154 A1 US20150050154 A1 US 20150050154A1 US 201313900756 A US201313900756 A US 201313900756A US 2015050154 A1 US2015050154 A1 US 2015050154A1
- Authority
- US
- United States
- Prior art keywords
- trailing edge
- ridge
- airfoil
- sides
- airfoil trailing
- 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.)
- Abandoned
Links
- 239000011358 absorbing material Substances 0.000 claims abstract description 7
- 241000904500 Oxyspora paniculata Species 0.000 claims 1
- 239000000463 material Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011162 core material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005534 acoustic noise Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
-
- 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/04—Antivibration arrangements
-
- 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
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow 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
- 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
- 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
-
- 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 invention relates to noise reduction devices on airfoils, and particularly to devices for noise reduction on wind turbine blades having thick trailing edges.
- Airfoils with thick (or blunt) trailing edges may be used on wind turbine blades to improve aerodynamic and structural performance.
- thick trailing edges are subjected to larger aerodynamic pressure gradients across the trailing edge than are thin trailing edges. This leads to the generation of von-Karman vortex streets downstream of the airfoil, resulting in undesirable acoustic noise.
- FIG. 1 is a trailing portion of a prior art airfoil with a thick trailing edge shown generating von Karman vortex shedding in a slipstream.
- FIG. 5 shows an embodiment with a serrated ridge defining parallel smaller ridges.
- FIG. 8 shows an embodiment with serrations in a suction side corner of a ridge attachment.
- FIG. 9 shows an embodiment with serrations crossing a suction side corner of an airfoil trailing edge and a suction side corner of a ridge attachment.
- FIG. 1 shows an aft portion of a prior art airfoil 20 with a thick trailing edge 22 producing von Karman vortex shedding or a “vortex street” 24 in a fluid flow 26 .
- Such slipstream oscillations increase drag and noise under some conditions.
- “thick trailing edge” means a trailing edge that is blunt or squared, rather than sharp, such that it generates a von Karman vortex street under possible operating conditions absent the apparatus herein.
- FIG. 2 shows an aft portion of an airfoil 20 with a thick trailing edge 22 , on which is mounted or defined a noise reduction device 27 A in the form of a ridge 28 along the trailing edge, with a peak 30 of the ridge extending aft.
- the peak 30 may extend for example in a direction of extension of a mean camber line 40 or a chord line of the airfoil.
- this ridge forms two stationary vortices 42 instead of a vortex street ( 24 FIG. 1 ), thus eliminating the noise and drag of the vortex street.
- Each side 32 , 34 of the ridge 28 may span between a respective corner 46 , 48 of a squared trailing edge 22 and the peak 30 of the ridge 28 .
- corner in this context means a corner as seen in a cross sectional view.
- Each side 32 , 34 may form an inward angle A, B of at least 20 degrees relative to an extension of the respective suction and pressure sides 36 , 38 of the airfoil, or especially more than 30 degrees.
- the sides may be concave as shown.
- Such a ridge reduces the size of the stationary vortices 42 compared to that which would be produced by a flat splitter plate by providing a compact, smoothly contoured nest for each stationary vortex 42 .
- This noise reduction device 27 A may be made of a material compatible with the airfoil material, such as carbon fiber/polymer composite or fiberglass/polymer composite, but are not limited to such materials. Alternately, the device 27 A may be made of a more flexible material than the airfoil such as nylon, polyester or rubber that may deform to alleviate loads.
- the ridge 28 may be defined as comprising two walls 32 , 34 converging to a peak 30 from a respective suction side and pressure side of the trailing edge 22 , for example at inward angles A, B of at least 20 or 30 degrees.
- FIG. 3 shows an embodiment of the noise reduction device 27 B with a hollow interior 42 and perforations 44 A in both sides 32 , 34 .
- the perforations may be formed on only one of the sides 32 , 34 .
- the perforations are provided on both sides 32 , 34 , they provide metered pressure equalization across the ridge 28 .
- a solid ridge embodiment as in FIG. 2 may also include holes passing through the ridge from side 32 to side 34 for this purpose.
- FIG. 4 shows an embodiment of the noise reduction device 27 C similar to 27 B with further enhancements.
- the perforations 44 B may have at least two different diameters, providing progressively metered pressure equalization between the sides of the ridge.
- the peak 30 of the ridge may be serrated 50 .
- the serrations modify the coherence of the pressure wave structure emanating from the trailing edge, which attenuates the wave by the atmosphere, thus reducing noise.
- the hollow interior 42 FIG. 4
- the hollow interior may be filled with a core of sound absorbing material 43 , such as a breathable felt or open-cell foam that allows damped pressure equalization via the perforations 44 B or other known sound absorbing material.
- the perforations 44 B may extend partly or completely through the acoustic filler 43 .
- FIG. 7 shows an embodiment of the device 27 F with two pluralities of bristles 56 A, 56 B of varying lengths, with tips 58 arranged to define sides 32 , 34 of the ridge 28 .
- a splitter plate 60 may be provided between the first and second pluralities of bristles, in which case the distal end of the splitter plate defines the peak 30 of the ridge 28 .
- the splitter plate may be flexible and/or perforated.
- FIG. 8 shows an embodiment of the device 27 G with serrations 62 in a corner 64 of the suction side 32 and/or a corner 66 of the pressure side 34 of the ridge 28 .
- the serrations promote formation of eddies with higher frequencies than in unmodified vortex shedding. The higher frequencies attenuate faster in the atmosphere.
- FIG. 9 shows an embodiment of the device 27 G with serrations 62 A, 62 B that cut across one or both corners 46 , 48 of the trailing edge and cut across respective adjacent attached corners 64 , 66 of the ridge 28 .
- Such serrations may be ground into the suction side corner 46 and/or the pressure side corner 46 of the trailing edge after attachment of the ridge 28 onto the trailing edge.
- the serrations promote formation of eddies with higher frequencies than in unmodified vortex shedding.
- the ridge 28 of the invention may be fabricated separately from the airfoil 20 , and attached to it by adhesive or fasteners such as screws. With separate fabrication the ridge can use materials different from the airfoil that are specialized for sound reduction, such as flexible materials and sound absorbing core materials.
- the invention allows for site-specific trailing edge attachments. For example, high turbulence sites can use soft-passive trailing edge attachments.
- the ridge 28 can be cast along with the blade as long as it can withstand the temperatures experienced during casting.
- the ridge may be formed integrally with the airfoil, for example by grinding the trailing edge into a ridge geometry as described and shown herein. If the ridge is formed integral, the trailing edge as discussed herein is defined as an imaginary plane extending between the suction side and the pressure side between the corners 46 , 48 .
- FIG. 10 shows a thick trailing edge 22 with a corner 46 modified with serrations 62 A, providing benefits similar to the serrations described for FIGS. 8 and 9 .
- Such serrations may be formed on one or both of the pressure and suction sides, and they may be of uniform size and shape over the entire airfoil, or they may be of varying sizes and/or shapes on one or both sides, and they may be cooperatively formed and positioned between the two sides to provide a desired noise reduction effect.
- thicker trailing edges may result in better resistance to buckling than thin trailing edges. This may become increasingly relevant for swept blades.
- a thick trailing edge allows blade designers to tailor the blade torsional stiffness. Reducing torsional stiffness allows a more twistable blade without sacrificing the flap stiffness needed to control tip deflections and avoid tower strikes.
- a thick trailing edge allows greater freedom to add or remove edgewise stiffness to prevent dynamic structural/aerodynamic instabilities such as unstable whirling modes. Thickness is an alternative to large amounts of pre-deflection flap, which presents transportation and manufacturing issues.
- Thin trailing edges are prone to damage by tight straps or other objects during transportation. Damaged trailing edges are likely to be repaired in a way that creates additional aerodynamic noise due to grinding roughness or inaccurate shape.
Abstract
Description
- The invention relates to noise reduction devices on airfoils, and particularly to devices for noise reduction on wind turbine blades having thick trailing edges.
- Airfoils with thick (or blunt) trailing edges may be used on wind turbine blades to improve aerodynamic and structural performance. However, thick trailing edges are subjected to larger aerodynamic pressure gradients across the trailing edge than are thin trailing edges. This leads to the generation of von-Karman vortex streets downstream of the airfoil, resulting in undesirable acoustic noise.
- The invention is explained in the following description in view of the drawings that show:
-
FIG. 1 is a trailing portion of a prior art airfoil with a thick trailing edge shown generating von Karman vortex shedding in a slipstream. -
FIG. 2 is a partial sectional view of an airfoil trailing edge with a noise reduction ridge attachment according to an embodiment of the invention. -
FIG. 3 shows an embodiment with a hollow center and side perforations. -
FIG. 4 shows an embodiment as inFIG. 3 with a core of sound-absorbing material, progressive perforations, and with a serrated peak. -
FIG. 5 shows an embodiment with a serrated ridge defining parallel smaller ridges. -
FIG. 6 shows an embodiment with bristles or brushes attached to a ridge. -
FIG. 7 shows an embodiment with bristles or brushes of varying length defining a ridge. -
FIG. 8 shows an embodiment with serrations in a suction side corner of a ridge attachment. -
FIG. 9 shows an embodiment with serrations crossing a suction side corner of an airfoil trailing edge and a suction side corner of a ridge attachment. -
FIG. 10 shows an embodiment with serrations in a suction side corner of an airfoil trailing edge. -
FIG. 1 shows an aft portion of aprior art airfoil 20 with a thicktrailing edge 22 producing von Karman vortex shedding or a “vortex street” 24 in afluid flow 26. Such slipstream oscillations increase drag and noise under some conditions. Herein, “thick trailing edge” means a trailing edge that is blunt or squared, rather than sharp, such that it generates a von Karman vortex street under possible operating conditions absent the apparatus herein. -
FIG. 2 shows an aft portion of anairfoil 20 with a thicktrailing edge 22, on which is mounted or defined anoise reduction device 27A in the form of aridge 28 along the trailing edge, with apeak 30 of the ridge extending aft. Thepeak 30 may extend for example in a direction of extension of amean camber line 40 or a chord line of the airfoil. In some embodiments, this ridge forms twostationary vortices 42 instead of a vortex street (24FIG. 1 ), thus eliminating the noise and drag of the vortex street. - Each
side ridge 28 may span between arespective corner trailing edge 22 and thepeak 30 of theridge 28. Herein “corner” in this context means a corner as seen in a cross sectional view. Eachside pressure sides stationary vortices 42 compared to that which would be produced by a flat splitter plate by providing a compact, smoothly contoured nest for eachstationary vortex 42. This results in a smoother and more compact slipstream that produces less drag and noise. Thisnoise reduction device 27A may be made of a material compatible with the airfoil material, such as carbon fiber/polymer composite or fiberglass/polymer composite, but are not limited to such materials. Alternately, thedevice 27A may be made of a more flexible material than the airfoil such as nylon, polyester or rubber that may deform to alleviate loads. - If the trailing edge is blunt without
sharp corners ridge 28 may be defined as comprising twowalls peak 30 from a respective suction side and pressure side of thetrailing edge 22, for example at inward angles A, B of at least 20 or 30 degrees. -
FIG. 3 shows an embodiment of thenoise reduction device 27B with ahollow interior 42 andperforations 44A in bothsides sides sides ridge 28. A solid ridge embodiment as inFIG. 2 may also include holes passing through the ridge fromside 32 toside 34 for this purpose. -
FIG. 4 shows an embodiment of thenoise reduction device 27C similar to 27B with further enhancements. Theperforations 44B may have at least two different diameters, providing progressively metered pressure equalization between the sides of the ridge. Thepeak 30 of the ridge may be serrated 50. The serrations modify the coherence of the pressure wave structure emanating from the trailing edge, which attenuates the wave by the atmosphere, thus reducing noise. The hollow interior (42FIG. 4 ) may be filled with a core ofsound absorbing material 43, such as a breathable felt or open-cell foam that allows damped pressure equalization via theperforations 44B or other known sound absorbing material. Optionally, theperforations 44B may extend partly or completely through theacoustic filler 43. -
FIG. 5 shows an embodiment of thedevice 27D in which eachside ridge 28 is serrated to form a series of secondary ridges orspoilers peak 30 of the ridge, and may have anouter surface suction sides airfoil 20. Theridge 28 may be solid, hollow, or filled with a sound absorbing material and/or may haveperforations 44 through one or both sides. Thespoilers -
FIG. 6 shows an embodiment of thedevice 27E withbristles 56 on both sides of theridge 28. The bristles may be oriented with amean camber liner 40 or a chord line or with the nearest pressure orsuction side -
FIG. 7 shows an embodiment of thedevice 27F with two pluralities ofbristles tips 58 arranged to definesides ridge 28. Asplitter plate 60 may be provided between the first and second pluralities of bristles, in which case the distal end of the splitter plate defines thepeak 30 of theridge 28. The splitter plate may be flexible and/or perforated. -
FIG. 8 shows an embodiment of thedevice 27G withserrations 62 in acorner 64 of thesuction side 32 and/or acorner 66 of thepressure side 34 of theridge 28. The serrations promote formation of eddies with higher frequencies than in unmodified vortex shedding. The higher frequencies attenuate faster in the atmosphere. -
FIG. 9 shows an embodiment of thedevice 27G withserrations corners corners ridge 28. Such serrations may be ground into thesuction side corner 46 and/or thepressure side corner 46 of the trailing edge after attachment of theridge 28 onto the trailing edge. The serrations promote formation of eddies with higher frequencies than in unmodified vortex shedding. - The
ridge 28 of the invention may be fabricated separately from theairfoil 20, and attached to it by adhesive or fasteners such as screws. With separate fabrication the ridge can use materials different from the airfoil that are specialized for sound reduction, such as flexible materials and sound absorbing core materials. The invention allows for site-specific trailing edge attachments. For example, high turbulence sites can use soft-passive trailing edge attachments. Alternatively, theridge 28 can be cast along with the blade as long as it can withstand the temperatures experienced during casting. - Another benefit is that wind turbine blades with thick trailing edges can be transported without damage to the trailing edge because the ridge can be attached to the blade on site. Alternately, in some embodiments the ridge may be formed integrally with the airfoil, for example by grinding the trailing edge into a ridge geometry as described and shown herein. If the ridge is formed integral, the trailing edge as discussed herein is defined as an imaginary plane extending between the suction side and the pressure side between the
corners -
FIG. 10 shows athick trailing edge 22 with acorner 46 modified withserrations 62A, providing benefits similar to the serrations described forFIGS. 8 and 9 . Such serrations may be formed on one or both of the pressure and suction sides, and they may be of uniform size and shape over the entire airfoil, or they may be of varying sizes and/or shapes on one or both sides, and they may be cooperatively formed and positioned between the two sides to provide a desired noise reduction effect. - Benefits of thick trailing edges on wind turbine blades may include:
- For some manufacturing methods, thicker trailing edges may result in better resistance to buckling than thin trailing edges. This may become increasingly relevant for swept blades.
- A thick trailing edge allows blade designers to tailor the blade torsional stiffness. Reducing torsional stiffness allows a more twistable blade without sacrificing the flap stiffness needed to control tip deflections and avoid tower strikes.
- A thick trailing edge allows greater freedom to add or remove edgewise stiffness to prevent dynamic structural/aerodynamic instabilities such as unstable whirling modes. Thickness is an alternative to large amounts of pre-deflection flap, which presents transportation and manufacturing issues.
- Thin trailing edges are prone to damage by tight straps or other objects during transportation. Damaged trailing edges are likely to be repaired in a way that creates additional aerodynamic noise due to grinding roughness or inaccurate shape.
- Benign extreme loads. Thick trailing edge sections exhibit lower flap loads under extreme conditions.
- While various embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions may be made without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/900,756 US20150050154A1 (en) | 2013-05-23 | 2013-05-23 | Airfoil trailing edge apparatus for noise reduction |
DK14168222.9T DK2806156T3 (en) | 2013-05-23 | 2014-05-14 | Airfoil trailing edge device for noise reduction |
EP14168222.9A EP2806156B1 (en) | 2013-05-23 | 2014-05-14 | Airfoil trailing edge apparatus for noise reduction |
CN201410220706.9A CN104179642A (en) | 2013-05-23 | 2014-05-23 | Airfoil trailing edge apparatus fo noise reduction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/900,756 US20150050154A1 (en) | 2013-05-23 | 2013-05-23 | Airfoil trailing edge apparatus for noise reduction |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150050154A1 true US20150050154A1 (en) | 2015-02-19 |
Family
ID=50731938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/900,756 Abandoned US20150050154A1 (en) | 2013-05-23 | 2013-05-23 | Airfoil trailing edge apparatus for noise reduction |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150050154A1 (en) |
EP (1) | EP2806156B1 (en) |
CN (1) | CN104179642A (en) |
DK (1) | DK2806156T3 (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140271213A1 (en) * | 2013-03-15 | 2014-09-18 | General Electric Company | Airfoil modifiers for wind turbine rotor blades |
US20170145990A1 (en) * | 2015-11-25 | 2017-05-25 | General Electric Company | Wind turbine noise reduction with acoustically absorbent serrations |
US20170174321A1 (en) * | 2015-12-18 | 2017-06-22 | Amazon Technologies, Inc. | Propeller treatments for sound dampening |
EP3219980A1 (en) * | 2016-03-16 | 2017-09-20 | Siemens Aktiengesellschaft | Trailing edge air duct of a wind turbine rotor blade |
JP2018510995A (en) * | 2015-04-10 | 2018-04-19 | ヴォッベン プロパティーズ ゲーエムベーハーWobben Properties Gmbh | Wind power generator-rotor blade |
US9963187B1 (en) * | 2017-08-25 | 2018-05-08 | Accell North America, Inc. | Aerodynamic bicycle frame |
US20180171975A1 (en) * | 2015-01-24 | 2018-06-21 | Dieter Röhm | Multi-functional flap used as a back-flow flap |
US10011346B2 (en) | 2015-12-18 | 2018-07-03 | Amazon Technologies, Inc. | Propeller blade indentations for improved aerodynamic performance and sound control |
US10099773B2 (en) | 2015-12-18 | 2018-10-16 | Amazon Technologies, Inc. | Propeller blade leading edge serrations for improved sound control |
US10259574B2 (en) | 2015-12-18 | 2019-04-16 | Amazon Technologies, Inc. | Propeller surface area treatments for sound dampening |
US10259562B2 (en) | 2015-12-18 | 2019-04-16 | Amazon Technologies, Inc. | Propeller blade trailing edge fringes for improved sound control |
US10460717B2 (en) | 2015-12-18 | 2019-10-29 | Amazon Technologies, Inc. | Carbon nanotube transducers on propeller blades for sound control |
US10746157B2 (en) | 2018-08-31 | 2020-08-18 | General Electric Company | Noise reducer for a wind turbine rotor blade having a cambered serration |
US10767623B2 (en) | 2018-04-13 | 2020-09-08 | General Electric Company | Serrated noise reducer for a wind turbine rotor blade |
US10767625B2 (en) * | 2016-09-09 | 2020-09-08 | Wobben Properties Gmbh | Wind turbine rotor blade |
US10933988B2 (en) | 2015-12-18 | 2021-03-02 | Amazon Technologies, Inc. | Propeller blade treatments for sound control |
US11163302B2 (en) | 2018-09-06 | 2021-11-02 | Amazon Technologies, Inc. | Aerial vehicle propellers having variable force-torque ratios |
US20220120253A1 (en) * | 2019-01-18 | 2022-04-21 | Ge Renewable Technologies | Hydroturbine runner blade local extension to avoid cavitation erosion |
US11448183B2 (en) * | 2017-05-22 | 2022-09-20 | Lm Wind Power Us Technology Aps | Wind turbine blade comprising a noise reducing device |
US20230045480A1 (en) * | 2019-12-30 | 2023-02-09 | Seoul National University R&Db Foundation | Blade noise reduction device |
US11708813B2 (en) | 2019-11-26 | 2023-07-25 | Siemens Gamesa Renewable Energy A/S | Wind turbine rotor blade flow guiding device and wind turbine rotor blade |
US11719224B2 (en) | 2018-02-19 | 2023-08-08 | Wobben Properties Gmbh | Rotor blade of a wind turbine, having a splitter plate |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201410675D0 (en) | 2014-06-16 | 2014-07-30 | Univ Brunel | Noise reduction to the trailing edge of fluid dynamic bodies |
US10087912B2 (en) | 2015-01-30 | 2018-10-02 | General Electric Company | Vortex generator for a rotor blade |
CN105508150B (en) * | 2015-12-23 | 2018-04-03 | 上海理工大学 | A kind of pneumatic equipment bladess based on Fractals design |
WO2018103803A1 (en) * | 2016-12-06 | 2018-06-14 | Vestas Wind Systems A/S | A wind turbine blade having a truncated trailing edge |
KR102027226B1 (en) * | 2017-06-16 | 2019-10-01 | 에어버스 헬리콥터스 | Aircraft rotor blade sleeves with projections in the rear zone, and rotors provided with such sleeves |
FR3079552B1 (en) * | 2018-03-29 | 2021-06-04 | Safran Aircraft Engines | TURBOMACHINE WITH AT LEAST ONE UPSTREAM VANE INCLUDING A BLOWING PORTION TO LIMIT THE RESONANCE OF A DOWNSTREAM VANE |
US10788053B2 (en) * | 2018-10-25 | 2020-09-29 | General Electric Company | Noise reducing gas turbine engine airfoil |
CN109677589A (en) * | 2018-12-20 | 2019-04-26 | 中国空气动力研究与发展中心低速空气动力研究所 | It is a kind of based on sawtooth-bristle coupled structure rear noise suppressing method |
DE102019113080A1 (en) | 2019-05-17 | 2020-11-19 | Wobben Properties Gmbh | Rotor blade and wind turbine |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5252381A (en) * | 1992-06-18 | 1993-10-12 | Adler Alan John | Airfoil with thick trailing edge |
US20080187442A1 (en) * | 2007-02-07 | 2008-08-07 | Kevin James Standish | Rotor blade trailing edge assembly and method of use |
US20080298967A1 (en) * | 2007-05-31 | 2008-12-04 | Gamesa Innovation & Technology, S.L. | Wind turbine blade with anti-noise devices |
US20090016891A1 (en) * | 2007-07-12 | 2009-01-15 | General Electric Company | Wind turbine blade tip vortex breakers |
US20090274559A1 (en) * | 2006-04-13 | 2009-11-05 | Repower Systems Ag | Rotor blade of a wind energy unit |
US20090290982A1 (en) * | 2006-07-07 | 2009-11-26 | Danmarks Tekiske Universitet | Variable trailing edge section geometry for wind turbine blade |
US7637721B2 (en) * | 2005-07-29 | 2009-12-29 | General Electric Company | Methods and apparatus for producing wind energy with reduced wind turbine noise |
US20110211954A1 (en) * | 2011-03-22 | 2011-09-01 | General Electric Company | Lift device for rotor blade in wind turbine |
US20110223030A1 (en) * | 2010-12-16 | 2011-09-15 | General Electric Company | Noise reducer for rotor blade in wind turbine |
US20120027590A1 (en) * | 2011-05-31 | 2012-02-02 | General Electric Company | Noise reducer for rotor blade in wind turbine |
US20120063913A1 (en) * | 2009-05-18 | 2012-03-15 | Lm Glasfiber A/S | Method of manufacturing a wind turbine blade having predesigned segment |
US20120134817A1 (en) * | 2011-10-19 | 2012-05-31 | General Electric Company | Wind turbine rotor blade with trailing edge extension and method of attachment |
EP2568166A1 (en) * | 2011-09-09 | 2013-03-13 | Nordex Energy GmbH | Wind energy assembly rotor blade with a thick profile trailing edge |
US20130071253A1 (en) * | 2011-09-19 | 2013-03-21 | Gunter Fischer | Wind Turbine Rotor Blade having a Thick Profile Trailing Edge |
US20140286784A1 (en) * | 2011-11-23 | 2014-09-25 | Lm Wp Patent Holding A/S | Wind turbine blade |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011157849A2 (en) * | 2010-06-18 | 2011-12-22 | Suzlon Blade Technology B.V. | Rotor blade for a wind turbine |
-
2013
- 2013-05-23 US US13/900,756 patent/US20150050154A1/en not_active Abandoned
-
2014
- 2014-05-14 DK DK14168222.9T patent/DK2806156T3/en active
- 2014-05-14 EP EP14168222.9A patent/EP2806156B1/en not_active Not-in-force
- 2014-05-23 CN CN201410220706.9A patent/CN104179642A/en active Pending
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5252381A (en) * | 1992-06-18 | 1993-10-12 | Adler Alan John | Airfoil with thick trailing edge |
US7637721B2 (en) * | 2005-07-29 | 2009-12-29 | General Electric Company | Methods and apparatus for producing wind energy with reduced wind turbine noise |
US20090274559A1 (en) * | 2006-04-13 | 2009-11-05 | Repower Systems Ag | Rotor blade of a wind energy unit |
US20090290982A1 (en) * | 2006-07-07 | 2009-11-26 | Danmarks Tekiske Universitet | Variable trailing edge section geometry for wind turbine blade |
US20080187442A1 (en) * | 2007-02-07 | 2008-08-07 | Kevin James Standish | Rotor blade trailing edge assembly and method of use |
US20080298967A1 (en) * | 2007-05-31 | 2008-12-04 | Gamesa Innovation & Technology, S.L. | Wind turbine blade with anti-noise devices |
US20090016891A1 (en) * | 2007-07-12 | 2009-01-15 | General Electric Company | Wind turbine blade tip vortex breakers |
US20120063913A1 (en) * | 2009-05-18 | 2012-03-15 | Lm Glasfiber A/S | Method of manufacturing a wind turbine blade having predesigned segment |
US20110223030A1 (en) * | 2010-12-16 | 2011-09-15 | General Electric Company | Noise reducer for rotor blade in wind turbine |
US20110211954A1 (en) * | 2011-03-22 | 2011-09-01 | General Electric Company | Lift device for rotor blade in wind turbine |
US20120027590A1 (en) * | 2011-05-31 | 2012-02-02 | General Electric Company | Noise reducer for rotor blade in wind turbine |
EP2568166A1 (en) * | 2011-09-09 | 2013-03-13 | Nordex Energy GmbH | Wind energy assembly rotor blade with a thick profile trailing edge |
US20130071253A1 (en) * | 2011-09-19 | 2013-03-21 | Gunter Fischer | Wind Turbine Rotor Blade having a Thick Profile Trailing Edge |
US20120134817A1 (en) * | 2011-10-19 | 2012-05-31 | General Electric Company | Wind turbine rotor blade with trailing edge extension and method of attachment |
US20140286784A1 (en) * | 2011-11-23 | 2014-09-25 | Lm Wp Patent Holding A/S | Wind turbine blade |
Non-Patent Citations (1)
Title |
---|
EP 2568166 (03-2013) Fischer, Gunter. Foreign Referene copy, Translated Abstract; Translated description * |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9377005B2 (en) * | 2013-03-15 | 2016-06-28 | General Electric Company | Airfoil modifiers for wind turbine rotor blades |
US20140271213A1 (en) * | 2013-03-15 | 2014-09-18 | General Electric Company | Airfoil modifiers for wind turbine rotor blades |
US20180171975A1 (en) * | 2015-01-24 | 2018-06-21 | Dieter Röhm | Multi-functional flap used as a back-flow flap |
JP2018510995A (en) * | 2015-04-10 | 2018-04-19 | ヴォッベン プロパティーズ ゲーエムベーハーWobben Properties Gmbh | Wind power generator-rotor blade |
US20170145990A1 (en) * | 2015-11-25 | 2017-05-25 | General Electric Company | Wind turbine noise reduction with acoustically absorbent serrations |
US11268489B2 (en) | 2015-11-25 | 2022-03-08 | General Electric Company | Wind turbine noise reduction with acoustically absorbent serrations |
US10240576B2 (en) * | 2015-11-25 | 2019-03-26 | General Electric Company | Wind turbine noise reduction with acoustically absorbent serrations |
US10259574B2 (en) | 2015-12-18 | 2019-04-16 | Amazon Technologies, Inc. | Propeller surface area treatments for sound dampening |
US10460717B2 (en) | 2015-12-18 | 2019-10-29 | Amazon Technologies, Inc. | Carbon nanotube transducers on propeller blades for sound control |
US10011346B2 (en) | 2015-12-18 | 2018-07-03 | Amazon Technologies, Inc. | Propeller blade indentations for improved aerodynamic performance and sound control |
US10099773B2 (en) | 2015-12-18 | 2018-10-16 | Amazon Technologies, Inc. | Propeller blade leading edge serrations for improved sound control |
US20170174321A1 (en) * | 2015-12-18 | 2017-06-22 | Amazon Technologies, Inc. | Propeller treatments for sound dampening |
US10933988B2 (en) | 2015-12-18 | 2021-03-02 | Amazon Technologies, Inc. | Propeller blade treatments for sound control |
US10259562B2 (en) | 2015-12-18 | 2019-04-16 | Amazon Technologies, Inc. | Propeller blade trailing edge fringes for improved sound control |
US10399665B2 (en) | 2015-12-18 | 2019-09-03 | Amazon Technologies, Inc. | Propeller blade indentations for improved aerodynamic performance and sound control |
US20170268480A1 (en) * | 2016-03-16 | 2017-09-21 | Siemens Aktiengesellschaft | Trailing edge air duct of a wind turbine rotor blade |
EP3219980A1 (en) * | 2016-03-16 | 2017-09-20 | Siemens Aktiengesellschaft | Trailing edge air duct of a wind turbine rotor blade |
US10767625B2 (en) * | 2016-09-09 | 2020-09-08 | Wobben Properties Gmbh | Wind turbine rotor blade |
US11448183B2 (en) * | 2017-05-22 | 2022-09-20 | Lm Wind Power Us Technology Aps | Wind turbine blade comprising a noise reducing device |
US9963187B1 (en) * | 2017-08-25 | 2018-05-08 | Accell North America, Inc. | Aerodynamic bicycle frame |
US11719224B2 (en) | 2018-02-19 | 2023-08-08 | Wobben Properties Gmbh | Rotor blade of a wind turbine, having a splitter plate |
US10767623B2 (en) | 2018-04-13 | 2020-09-08 | General Electric Company | Serrated noise reducer for a wind turbine rotor blade |
US10746157B2 (en) | 2018-08-31 | 2020-08-18 | General Electric Company | Noise reducer for a wind turbine rotor blade having a cambered serration |
US11163302B2 (en) | 2018-09-06 | 2021-11-02 | Amazon Technologies, Inc. | Aerial vehicle propellers having variable force-torque ratios |
US20220120253A1 (en) * | 2019-01-18 | 2022-04-21 | Ge Renewable Technologies | Hydroturbine runner blade local extension to avoid cavitation erosion |
US11708813B2 (en) | 2019-11-26 | 2023-07-25 | Siemens Gamesa Renewable Energy A/S | Wind turbine rotor blade flow guiding device and wind turbine rotor blade |
US20230045480A1 (en) * | 2019-12-30 | 2023-02-09 | Seoul National University R&Db Foundation | Blade noise reduction device |
Also Published As
Publication number | Publication date |
---|---|
EP2806156A1 (en) | 2014-11-26 |
EP2806156B1 (en) | 2016-08-24 |
CN104179642A (en) | 2014-12-03 |
DK2806156T3 (en) | 2016-11-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2806156B1 (en) | Airfoil trailing edge apparatus for noise reduction | |
US7901189B2 (en) | Wind-turbine blade and method for reducing noise in wind turbine | |
CN102808725B (en) | For the denoising device of the rotor blade in wind turbine | |
US9377005B2 (en) | Airfoil modifiers for wind turbine rotor blades | |
US9932960B2 (en) | Rotor blade of a wind turbine | |
JP5297558B1 (en) | Wind turbine blade, wind turbine generator equipped with the wind turbine blade, and wind turbine blade design method | |
US10465652B2 (en) | Vortex generators for wind turbine rotor blades having noise-reducing features | |
JP6154553B2 (en) | Rotor blade of wind power generator and wind power generator | |
US10451033B2 (en) | Noise reducer for a wind turbine blade | |
US20110150664A1 (en) | Aeroacoustic rotor blade for a wind turbine, and wind turbine equipped therewith | |
US20160177914A1 (en) | Rotor blade with vortex generators | |
US20190353142A1 (en) | Wind turbine blade comprising a trailing edge noise reducing device | |
US11067057B2 (en) | Splitter plate arrangement for a serrated wind turbine blade | |
US20180216600A1 (en) | Noise Reducing Fence for a Wind Turbine Blade | |
BR112018009900B1 (en) | SUPER LOW NOISE INDUSTRIAL AXIAL FAN, HAS LARGE DIAMETER AND ADJUSTABLE INCLINATION ANGLE | |
WO2018103803A1 (en) | A wind turbine blade having a truncated trailing edge | |
Jaffar et al. | Aerodynamics improvement of DU97-W-300 wind turbine flat-back airfoil using slot-induced air jet | |
Chen et al. | Experimental investigation on noise emissions of an airfoil with non-flat plate trailing edge serrations | |
JP2015042864A (en) | Blade and wind turbine for wind power generation | |
JP7277316B2 (en) | Wind turbine blade device and wind turbine blade attachment member | |
JP5996083B2 (en) | Wind turbine blade and manufacturing method thereof | |
EP2851556A1 (en) | Arrangement to reduce noise of a wind turbine rotor blade | |
JP2016070212A (en) | Low noise blade, and low noise blade device | |
Bianchi et al. | A critical review of passive noise control techniques in industrial fans | |
CN217712800U (en) | Blade noise reduction device and wind power blade |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIEMENS ENERGY, INC, FLORIDA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DIXON, KRISTIAN R.;ZAMORA RODRIGUEZ, ALONSO O.;ASHEIM, MICHAEL J.;AND OTHERS;SIGNING DATES FROM 20130412 TO 20130416;REEL/FRAME:030473/0936 Owner name: SIEMENS WIND POWER A/S, DENMARK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HANSEN, HENRIK FREDSLUND;REEL/FRAME:030474/0098 Effective date: 20130417 |
|
AS | Assignment |
Owner name: SIEMENS WIND POWER A/S, DENMARK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SIEMENS ENERGY, INC.;REEL/FRAME:030549/0155 Effective date: 20130531 |
|
AS | Assignment |
Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SIEMENS WIND POWER A/S;REEL/FRAME:030633/0178 Effective date: 20130606 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |