US20110211952A1 - Rotor blade for wind turbine - Google Patents

Rotor blade for wind turbine Download PDF

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Publication number
US20110211952A1
US20110211952A1 US13/024,623 US201113024623A US2011211952A1 US 20110211952 A1 US20110211952 A1 US 20110211952A1 US 201113024623 A US201113024623 A US 201113024623A US 2011211952 A1 US2011211952 A1 US 2011211952A1
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US
United States
Prior art keywords
tip
rotor blade
air
purge
interior
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
Application number
US13/024,623
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English (en)
Inventor
Rohit Chouhan
EswaraRao V. S. J. Anjuri
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US13/024,623 priority Critical patent/US20110211952A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANJURI, ESWARARAO V S J, CHOUHAN, ROHIT
Publication of US20110211952A1 publication Critical patent/US20110211952A1/en
Priority to DE102012101070A priority patent/DE102012101070A1/de
Priority to DKPA201270065A priority patent/DK201270065A/da
Priority to CN2012100371799A priority patent/CN102635494A/zh
Abandoned legal-status Critical Current

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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
    • 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
    • F05B2260/60—Fluid transfer
    • 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
    • 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 disclosure relates in general to wind turbine rotor blades, and more particularly to noise reduction features defined in the rotor blades.
  • Wind power is considered one of the cleanest, most environmentally friendly energy sources presently available, and wind turbines have gained increased attention in this regard.
  • a modern wind turbine typically includes a tower, generator, gearbox, nacelle, and one or more rotor blades.
  • the rotor blades capture kinetic energy of wind using known foil principles.
  • the rotor blades transmit the kinetic energy in the form of rotational energy so as to turn a shaft coupling the rotor blades to a gearbox, or if a gearbox is not used, directly to the generator.
  • the generator then converts the mechanical energy to electrical energy that may be deployed to a utility grid.
  • the rotor blades may produce noise of varying frequencies due to the flow of air past the rotor blades. As wind turbines are increasingly located near populated areas, this noise can be disruptive to the populace and thus is generally undesirable.
  • noise that may be produced by the rotor blades is a generally high frequency broadband noise caused by flow vortices at the tip of the rotor blade.
  • the flow vortices are generally caused by the interaction of flow over the tip from the pressure side and the suction side. The flow vortices may then interact with the tip and the trailing edge of the rotor blade, causing the generally high frequency broadband noise. Additionally, the flow vortices may disturb streamline flows off of the pressure side and the suction side near the tip, thus reducing the performance of the rotor blade.
  • a rotor blade for a wind turbine includes a body having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root, the surfaces further defining an interior.
  • the rotor blade further includes at least one purge conduit defined in the tip and configured for exhausting air from the interior such that the air generally reduces noise at the tip.
  • a method for reducing rotor blade noise includes flowing air through an interior of the rotor blade.
  • the rotor blade includes a body having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root, the surfaces further defining the interior.
  • the method further includes flowing at least a portion of the air through at least one purge conduit defined proximate the tip of the rotor blade, and exhausting at least a portion of the air from the purge conduit such that the air interferes with a tip flow vortex and generally reduces noise at the tip.
  • FIG. 1 is a perspective view of a wind turbine according to one embodiment of the present disclosure
  • FIG. 2 is a perspective view of a rotor blade according to one embodiment of the present disclosure
  • FIG. 3 is a front view of a tip defining a plurality of purge conduits according to one embodiment of the present disclosure
  • FIG. 4 is a front view of a tip defining a plurality of purge conduits according to another embodiment of the present disclosure
  • FIG. 5 is a cross-sectional view, through the lines 5 - 5 of FIG. 3 , of a tip defining a plurality of purge conduits according to one embodiment of the present disclosure
  • FIG. 6 is a cross-sectional view of a tip defining a plurality of purge conduits according to another embodiment of the present disclosure.
  • FIG. 7 is a perspective view of a portion of a rotor blade including a tip defining a plurality of purge conduits and further including a stagnation zone according to one embodiment of the present disclosure.
  • FIG. 1 illustrates a wind turbine 10 of conventional construction.
  • the wind turbine 10 includes a tower 12 with a nacelle 14 mounted thereon.
  • a plurality of rotor blades 16 are mounted to a rotor hub 18 , which is in turn connected to a main flange that turns a main rotor shaft.
  • the wind turbine power generation and control components are housed within the nacelle 14 .
  • the view of FIG. 1 is provided for illustrative purposes only to place the present invention in an exemplary field of use. It should be appreciated that the invention is not limited to any particular type of wind turbine configuration.
  • a rotor blade 16 comprises a body 20 .
  • the body 20 may include exterior surfaces defining a pressure side 22 and a suction side 24 (see FIGS. 3 through 7 ) extending between a leading edge 26 and a trailing edge 28 and between a blade tip 32 and a blade root 34 .
  • the tip 32 may, for purposes of the present disclosure, be the generally outermost surface of the body 20 . As shown in FIGS. 5 and 6 , for example, the tip 32 may comprise and extend between exterior surface 36 and interior surface 38 . Further, the various surfaces of the body 20 may define an interior 40 (see FIGS. 5 through 7 ) of the rotor blade 16 .
  • the rotor blade 16 may further define chord 42 and a span 44 . As shown in FIG. 2 , the chord 42 may vary throughout the span 44 of the rotor blade 16 . Thus, as discussed below, a local chord 46 may be defined for the rotor blade 16 at any point on the rotor blade 16 along the span 44 . For example, as shown in FIGS. 2 through 4 and 7 , a local chord 46 may be defined at the tip 32 , as well as at any other location throughout the span 44 of the rotor blade 16 .
  • the rotor blade 16 may include a plurality of individual blade segments aligned in an end-to-end order from the blade tip 32 to the blade root 34 .
  • Each of the individual blade segments may be uniquely configured so that the plurality of blade segments define a complete rotor blade 16 having a designed aerodynamic profile, length, and other desired characteristics.
  • each of the blade segments may have an aerodynamic profile that corresponds to the aerodynamic profile of adjacent blade segments.
  • the aerodynamic profiles of the blade segments may form a continuous aerodynamic profile of the rotor blade 16 .
  • the rotor blade 16 may be formed as a singular, unitary blade having the designed aerodynamic profile, length, and other desired characteristics.
  • the rotor blade 16 may, in exemplary embodiments, be curved. Curving of the rotor blade 16 may entail bending the rotor blade 16 in a generally flapwise direction and/or in a generally edgewise direction.
  • the flapwise direction may generally be construed as the direction (or the opposite direction) in which the aerodynamic lift acts on the rotor blade 16 .
  • the edgewise direction is generally perpendicular to the flapwise direction. Flapwise curvature of the rotor blade 16 is also known as pre-bend, while edgewise curvature is also known as sweep. Thus, a curved rotor blade 16 may be pre-bent and/or swept. Curving may enable the rotor blade 16 to better withstand flapwise and edgewise loads during operation of the wind turbine 10 , and may further provide clearance for the rotor blade 16 from the tower 12 during operation of the wind turbine 10 .
  • the air flowing past the rotor blade 16 may create various forms of noise.
  • air flowing past the rotor blade 16 may form at least one tip flow vortex 50 (see FIGS. 5 through 7 ), or a plurality of tip flow vortices 50 , at or adjacent to the tip 32 .
  • These tip flow vortices 50 may be caused by, for example, the interaction of air flows over the tip 32 from the pressure side 22 and the suction side 24 , or any other such air flows.
  • the air flow vortices 50 may interact with, for example, the tip 32 and/or the trailing edge 28 of the rotor blade 16 and/or other portions of the rotor blade 16 , causing noise.
  • the noise may be generally high frequency broadband noise.
  • the air flow vortices 50 may disturb streamline flows off of the pressure side 22 and the suction side 24 near the tip 32 , thus reducing the performance of the rotor blade 16 .
  • the rotor blade 16 of the present disclosure may thus include at least one purge conduit 100 or a plurality of purge conduits 100 .
  • the purge conduits 100 may be defined in the tip 32 .
  • the purge conduits 100 may be configured for exhausting air 102 (see FIGS. 5 through 7 ) from the interior 40 such that the air 102 generally reduces noise at the tip 32 .
  • the air 102 may generally reduce noise at the tip 32 by interacting with flow vortices at the tip to reduce the strength of the vortices and the interaction of the vortices with the rotor blade 16 surfaces at and/or adjacent to the tip 32 , thus reducing noise at the tip 32 .
  • air encompasses any suitable fluid, such as any suitable gas, that may be flowed through the interior 40 of the rotor blade 16 as discussed herein.
  • air 102 may flow through the interior 40 of the rotor blade 16 .
  • the air 102 may be supplied to the interior 40 in any suitable manner and through any suitable location or component of the rotor blade 16 .
  • the air 102 , or a portion thereof may in some embodiments be supplied to the interior 40 through the root 34 .
  • the air 102 , or at least a portion thereof may be supplied through a stagnation zone 104 on the rotor blade 16 , as shown in FIG. 7 .
  • the stagnation zone 104 in general, may be a zone on the exterior of the body 20 where air flow past the rotor blade 16 initially contacts the body 20 .
  • the location of the stagnation zone 104 is typically based on the angle of attack of the rotor blade 16 and the direction of the air flow past the rotor blade 16 .
  • the stagnation zone 104 or at least a portion thereof, is located on or adjacent to the leading edge 26 .
  • portions of the stagnation zone 104 or the entire stagnation zone 104 may alternatively be located on or adjacent to any suitable exterior surface of the body 20 , such as on the pressure side 22 or the suction side 24 .
  • an intake conduit 106 or a plurality of intake conduits 106 may be defined in the stagnation zone 104 .
  • the intake conduits 106 may be configured to flow air 102 to the interior 40 of the body 20 .
  • the intake conduits 106 may generally be tubes or other suitable conduits extending through the body 20 into the interior 40 .
  • the intake conduits 106 may have any suitable cross-sectional shape and/or area, and may taper and/or bend as desired to optimize the amount of air 102 flowed into the interior 40 .
  • the air 102 may be a portion of the air flow past the rotor blade 16 . When the air flow initially contacts the rotor blade 16 , a portion of the air flow, designated as air 102 , may be flowed into and through the intake conduits 106 , and into the interior 40 .
  • the intake conduits 106 may be located relatively near the tip 32 .
  • the intake conduits 106 may in some embodiments be located between approximately 0% and approximately 5% of the span 42 from the tip 32 . It should be understood, however, that the present disclosure is not limited to this range of locations, and rather that any suitable intake conduit 106 location is within the scope and spirit of the present disclosure.
  • the air 102 may be supplied to the interior 40 in any other suitable manner and through any suitable location or component of the rotor blade 16 .
  • the air 102 in the interior 40 of the rotor blade 16 may, during operation of the wind turbine 10 , flow through the interior 40 of the rotor blade 16 .
  • centrifugal forces due to rotation of the rotor blades 16 may cause the air 102 in the interior 40 to flow generally towards the tip 32 .
  • the flow of air 102 towards the tip 32 may increase the pressure of the air 102 proximate the tip 32 .
  • the pressure differential between the relatively high pressure interior 40 proximate the tip 32 and the pressure exterior to the rotor blade 16 may thus be utilized to flow the air 102 through the purge conduits 100 , as discussed below.
  • At least a portion of the air 102 in the interior 40 may be flowed through the purge conduits 100 and exhausted from the purge conduits 100 .
  • the exhausted air 102 may reduce the noise at the tip 32 of the rotor blade 16 by, for example, interfering with the tip flow vortices 50 , as discussed above, or otherwise generally acting to reduce noise.
  • a purge conduit 100 may comprise an inlet 112 and an outlet 114 .
  • the inlet 112 may be generally adjacent to the interior 40 and defined in the interior surface 38 of the tip 32
  • the outlet 114 may be generally spaced from the interior 40 and defined in the exterior surface 36 of the tip 32 .
  • the inlet 112 and the outlet 114 may generally define the purge conduit 100 therebetween, such that the purge conduit 100 extends between the inlet 112 and the outlet 114 .
  • At least a portion of the air 102 flowing through the interior 40 may enter the purge conduit 100 through the inlet 112 and flow through the purge conduit 100 .
  • This air 102 in the purge conduit 100 may then be exhausted from the purge conduit 100 through the outlet 114 , and may thus reduce noise at the tip 32 as discussed above.
  • the purge conduit 100 may be defined in the tip 32 at any location on the tip 32 .
  • a purge conduit 100 or a plurality of purge conduits 100 may be defined in the tip 32 generally adjacent to the pressure side 22 and/or generally adjacent to the suction side 24 .
  • the purge conduit 100 or purge conduits 100 may further generally follow the contour of the pressure side 22 and/or the suction side 24 , if desired.
  • a purge conduit 100 may have any suitable shape and size.
  • a purge conduit 100 may be a slot 122 .
  • the slot 122 may extend through any portion of the tip 32 .
  • a slot 122 may extend through a portion of the tip 32 generally adjacent to the pressure side 22 and/or generally adjacent to the suction side 24 , and/or may follow the contour of the pressure side 22 and/or the suction side 24 , as shown and discussed above.
  • a purge conduit 100 may be a hole 124 .
  • the hole 124 or a plurality of holes 124 , may be defined at any suitable location or locations on the tip 32 .
  • a plurality of holes 124 may extend through a portion of the tip 32 , similar to a slot 122 and as shown in FIG. 4 .
  • a plurality of holes 124 may extend through a portion of the tip 32 generally adjacent to the pressure side 22 and/or generally adjacent to the suction side 24 , and/or may follow the contour of the pressure side 22 and/or the suction side 24 , as shown and discussed above with regard to the slot 122 .
  • the slots 122 and holes 124 may have any suitable shapes and sizes.
  • the slots 122 and holes 124 may have cross-sectional shapes that are generally rectangular or square, oval or circular, triangular, or any other suitable polygonal shape.
  • the purge conduit 100 may taper between the inlet 112 and the outlet 114 .
  • the taper may be such that the inlet 112 is generally larger than the outlet 114 , such that air 102 flowing through the purge conduit 100 is accelerated, as shown in FIGS. 5 and 6 .
  • the taper may be such that the inlet 112 is generally smaller than the outlet 114 .
  • the taper of the purge conduit 100 may be through the entire length of the purge conduit 100 , or through a portion thereof.
  • the purge conduit 100 need not taper, and may, for example, have a generally constant area between the inlet 112 and the outlet 114 or have any other suitable configuration.
  • a purge conduit 100 may extend between the inlet 112 and the outlet 114 generally perpendicularly to the tip 32 , such as generally perpendicular to the exterior surface 36 of the tip 32 .
  • air 102 exhausted from the purge conduit 100 may be exhausted generally perpendicularly to the tip 32 .
  • a purge conduit 100 according to the present disclosure may extend between the inlet 112 and the outlet 114 at an angle 130 from perpendicular to the tip 32 .
  • the angle 130 may be in the range between approximately 0° and approximately 80°, or between approximately 0° and approximately 60°.
  • the angle 130 may be such that air 102 exhausted from the purge conduit 100 is exhausted generally towards, for example, the pressure side 22 , suction side 24 , leading edge 26 , or trailing edge 28 , or may be such that air 102 exhausted from the purge conduit 100 is exhausted generally away from, for example, the pressure side 22 , suction side 24 , leading edge 26 , or trailing edge 28 .
  • purge conduit 100 of the present disclosure is not limited to the above disclosed range of angles 130 , and rather that any suitable angle 130 or range of angles 130 is within the scope and spirit of the present disclosure.
  • a purge conduit 100 may be defined in the tip 32 at any location on the tip 32 .
  • a purge conduit 100 may defined at a particular chord-wise location in the tip 32 .
  • the tip 32 may define a local chord 46 .
  • a purge conduit 100 or purge conduits 100 may be located between approximately 0% and approximately 80%, between approximately 5% and approximately 80%, between approximately 0% and approximately 60%, or between approximately 5% and approximately 60% of the local chord 46 from the trailing edge 28 .
  • the present disclosure is further directed to a method for reducing rotor blade 16 noise.
  • the method may reduce noise at the tip 32 , such as noise caused by tip flow vortices 50 , as discussed above.
  • the method may include, for example, the step of flowing air 102 through the interior 40 of the rotor blade 16 , as discussed above.
  • the method may include, for example, the step of flowing at least a portion of the air 102 through at least one purge conduit 100 , or a plurality of purge conduits 100 , defined proximate the tip 32 of the rotor blade 16 .
  • the purge conduits 100 may be defined in the tip 32 of the rotor blade 16 , as discussed above.
  • the purge conduits 100 may be defined in another surface of the rotor blade 16 , such as the pressure side 24 , suction side 26 , leading edge 26 , or trailing edge 28 proximate the tip 32 , such as between approximately 0% and approximately 5% of the span 44 from the tip 32 .
  • the method may include, for example, the step of exhausting at least a portion of the air 102 from the purge conduit 100 or purge conduits 100 .
  • the air 102 exhausted from the purge conduits 100 may reduce noise at the tip 32 by, for example, interfering with a tip flow vortex 50 or a plurality of tip flow vortices 50 , as discussed above.
  • the method may include, for example, the step of flowing air 102 into the interior 40 .
  • air 102 may be flowed into the interior 40 through at least one intake conduit 106 or a plurality of intake conduits 106 , as discussed above.
  • the intake conduits 106 may be defined in a stagnation zone 104 , as discussed above.
  • the present rotor blade 16 and method for reducing rotor blade 16 noise may have a relatively significant impact on the noise at the tip 32 of the rotor blade 16 .
  • the inclusion of purge conduits 100 as described herein has been shown to reduce the average turbulent kinetic energy at the tip 32 .
  • the average turbulent kinetic energy at the tip 32 may be significantly reduced. This reduction causes a decrease in noise at the tip 32 .
  • the inclusion of purge conduits 100 as described herein has been shown to increase the power of the rotor blade 16 at the tip 32 .
US13/024,623 2011-02-10 2011-02-10 Rotor blade for wind turbine Abandoned US20110211952A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/024,623 US20110211952A1 (en) 2011-02-10 2011-02-10 Rotor blade for wind turbine
DE102012101070A DE102012101070A1 (de) 2011-02-10 2012-02-09 Rotorblatt für eine Windkraftanlage
DKPA201270065A DK201270065A (en) 2011-02-10 2012-02-09 Rotor blade for wind turbine
CN2012100371799A CN102635494A (zh) 2011-02-10 2012-02-10 用于风力涡轮机的转子叶片

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/024,623 US20110211952A1 (en) 2011-02-10 2011-02-10 Rotor blade for wind turbine

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US20110211952A1 true US20110211952A1 (en) 2011-09-01

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US13/024,623 Abandoned US20110211952A1 (en) 2011-02-10 2011-02-10 Rotor blade for wind turbine

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US (1) US20110211952A1 (de)
CN (1) CN102635494A (de)
DE (1) DE102012101070A1 (de)
DK (1) DK201270065A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705176A (zh) * 2012-05-18 2012-10-03 上海交通大学 带控制叶尖涡嵌入式导流管的风力机叶片
WO2016137745A1 (en) * 2015-02-25 2016-09-01 Northrop Grumman Systems Corporation Resonant blades using an aperture for cancellation of propeller generated noise
CN109386425A (zh) * 2017-08-09 2019-02-26 新疆工程学院 一种叶片前缘呈线性微孔状结构的风力机叶片及风力机
US11415107B2 (en) * 2017-09-11 2022-08-16 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Wind power generation apparatus, tower and method for suppressing tower shadow effect of tower

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103410656B (zh) * 2013-08-13 2015-07-15 河海大学常州校区 一种叶根部位转捩延迟控制的风力机叶片
DE102014205016A1 (de) * 2014-03-18 2015-09-24 Senvion Gmbh Geräuschreduziertes Rotorblatt einer Windenergieanlage

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713750A (en) * 1970-12-07 1973-01-30 Us Navy Circulation control rotor system
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
US3936013A (en) * 1973-12-17 1976-02-03 Shao Wen Yuan Vortex control
US5217349A (en) * 1989-08-31 1993-06-08 Technology Integration Incorporated System and method for suppressing noise produced by rotors
US5813625A (en) * 1996-10-09 1998-09-29 Mcdonnell Douglas Helicopter Company Active blowing system for rotorcraft vortex interaction noise reduction
US6948906B2 (en) * 2003-04-02 2005-09-27 University Of Maryland Rotor blade system with reduced blade-vortex interaction noise
US7354247B2 (en) * 2005-10-27 2008-04-08 General Electric Company Blade for a rotor of a wind energy turbine
US7387491B2 (en) * 2004-12-23 2008-06-17 General Electric Company Active flow modifications on wind turbine blades
US7435057B2 (en) * 2005-07-13 2008-10-14 Jorge Parera Blade for wind turbine
US20100014970A1 (en) * 2007-01-05 2010-01-21 Lm Glasfiber A/S Wind turbine blade with lift-regulating means in form of slots or holes
US20110229322A1 (en) * 2010-03-21 2011-09-22 Saied Tadayon Wind Turbine Blade System with Air Passageway
US20110293421A1 (en) * 2010-05-28 2011-12-01 Lockheed Martin Corporation Rotor blade having passive bleed path

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713750A (en) * 1970-12-07 1973-01-30 Us Navy Circulation control rotor system
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
US3936013A (en) * 1973-12-17 1976-02-03 Shao Wen Yuan Vortex control
US5217349A (en) * 1989-08-31 1993-06-08 Technology Integration Incorporated System and method for suppressing noise produced by rotors
US5813625A (en) * 1996-10-09 1998-09-29 Mcdonnell Douglas Helicopter Company Active blowing system for rotorcraft vortex interaction noise reduction
US6948906B2 (en) * 2003-04-02 2005-09-27 University Of Maryland Rotor blade system with reduced blade-vortex interaction noise
US7387491B2 (en) * 2004-12-23 2008-06-17 General Electric Company Active flow modifications on wind turbine blades
US7435057B2 (en) * 2005-07-13 2008-10-14 Jorge Parera Blade for wind turbine
US7354247B2 (en) * 2005-10-27 2008-04-08 General Electric Company Blade for a rotor of a wind energy turbine
US20100014970A1 (en) * 2007-01-05 2010-01-21 Lm Glasfiber A/S Wind turbine blade with lift-regulating means in form of slots or holes
US20110229322A1 (en) * 2010-03-21 2011-09-22 Saied Tadayon Wind Turbine Blade System with Air Passageway
US20110293421A1 (en) * 2010-05-28 2011-12-01 Lockheed Martin Corporation Rotor blade having passive bleed path

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705176A (zh) * 2012-05-18 2012-10-03 上海交通大学 带控制叶尖涡嵌入式导流管的风力机叶片
WO2016137745A1 (en) * 2015-02-25 2016-09-01 Northrop Grumman Systems Corporation Resonant blades using an aperture for cancellation of propeller generated noise
US9701394B2 (en) 2015-02-25 2017-07-11 Northrop Grumman Systems Corporation Resonant blades using an aperture for cancellation of propeller generated noise
CN109386425A (zh) * 2017-08-09 2019-02-26 新疆工程学院 一种叶片前缘呈线性微孔状结构的风力机叶片及风力机
US11415107B2 (en) * 2017-09-11 2022-08-16 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Wind power generation apparatus, tower and method for suppressing tower shadow effect of tower

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Publication number Publication date
CN102635494A (zh) 2012-08-15
DE102012101070A1 (de) 2012-08-16
DK201270065A (en) 2012-08-11

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