WO2001016482A1 - Blade for a wind turbine - Google Patents

Blade for a wind turbine

Info

Publication number
WO2001016482A1
WO2001016482A1 PCT/NL2000/000614 NL0000614W WO2001016482A1 WO 2001016482 A1 WO2001016482 A1 WO 2001016482A1 NL 0000614 W NL0000614 W NL 0000614W WO 2001016482 A1 WO2001016482 A1 WO 2001016482A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
blade
end
generators
side
profile
Prior art date
Application number
PCT/NL2000/000614
Other languages
French (fr)
Inventor
G. C. Corten
Original Assignee
Stichting Energieonderzoek Centrum Nederland
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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06Rotors
    • F03D1/065Rotors characterised by their construction, i.e. structural design details
    • F03D1/0675Rotors characterised by their construction, i.e. structural design details of the blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06Rotors
    • F03D1/0608Rotors characterised by their form
    • F03D1/0633Rotors characterised by their form of the blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2240/00Components
    • F05B2240/10Stators
    • F05B2240/12Fluid guiding means, e.g. vanes
    • F05B2240/122Vortex generators, turbulators, or the like, for mixing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2260/00Function
    • F05B2260/96Preventing, counteracting or reducing vibration or noise
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • Y02E10/721Blades or rotors

Abstract

Blade for a wind turbine, and wind turbine provided with a blade of this type. To optimize operation, i.e. to prevent a fall in efficiency occurring, it is proposed for the blade, adjacent of its free end, to be provided with turbulence-generating generators (12). These generators are preferably arranged at the transition between the furthest upstream part of the blade and the pressure side of the blade profile. It is assumed that the blade comprises a flow-optimized profile. Further improvement can be achieved if the free end is provided with a projection extending upstream.

Description

Blade for a wind turbine

The present invention relates to a blade for a wind turbine or the like, having a part which rotates in a flow of fluid, which blade comprises an attachment end, which is connected to the said wind turbine or such part, and a free end, which is at a distance from the attachment end, the blade comprising, at least in the vicinity of the free end, a profile which is optimized for a flow of fluid (air).

A blade of this type is generally known, and the flow-optimized profile exhibits considerable similarity to the profile of a standard aircraft wing or propeller blade. This means that, in the direction of movement of the blade, the incoming air firstly encounters a rounded part which on one side merges into a convex part and on the other side merges into a convex or concave part, which meet at a sharp point. However, it should be understood that other flow-optimized profiles are also conceivable and the precise design of the optimized profile of the blade is not essential to the invention.

Wind turbines are being designed for increasingly higher outputs. However, it has been found that in wind turbine parks where there are a number of wind turbines there are inexplicable differences in output between the individual wind turbines. Moreover, it has been found that certain turbines sometimes provide a much lower output than ought to be expected on the basis of the prevailing wind. This phenomenon may last for both a very short period (a few hours) and a very long period. This problem has been found to occur in particular in generators designed for a relatively high output, for example from 180 kW and more particularly from 500 kW.

The object of the present invention is to avoid this drawback and to provide a blade with which it is possible to achieve an output from the corresponding wind turbine which can be successfully predicted in advance, without inexplicable falls in the efficiency.

In a blade as described above, this object is achieved in that adjacent to one of the ends, turbulence-generating members are arranged near that side which lies upstream as seen in the direction of movement of the blade.

It is assumed that the fall in efficiency described above results from the fact that the tip, that is to say the free end of the blade and/or the attachment end, under certain circumstances reaches a stable stalled state. When the flow in the vicinity of the tip is released, vibrations are detected. These may be low-frequency vibrations. In an exceptional situation, it has even been observed that the blades begin to vibrate in the plane in which they rotate, which may ultimately lead to the blades breaking in the vicinity of the main shaft of the turbine. However, it should be understood that the question of whether the above explanation is correct is not connected with the validity of the appended claims.

It has been found that arranging vortex generators in the vicinity of the free end and more particularly in the vicinity of the upstream end of the wing, although possibly leading to a slight fall in efficiency, makes it possible to avoid the sometimes sudden fall in output.

The turbulence generators or vortex generators may be arranged on both the pressure side and the suction side of the blade, from the first point of contact between the air flow and the blade. Vortex generators of this type are preferably arranged on the suction side of the blade. In this context, the term suction side is understood as meaning the side extending from the upstream stagnation point to the back edge which is under the low pressure.

Apart from the intended object of preventing sudden changes in output from the wind turbine, the vortex generators in the vicinity of the free end achieve the additional advantage that the noise production is limited. This is because the avoidance of stalling makes it possible to avoid undesirable noise production.

The vortex generators may comprise any part of any shape which is known in the prior art. They are preferably designed as triangular flaps. More particularly, a series of these generators is arranged on the wing profile. This series may have a common base. The length of each generator, that is to say the distance which it has in common with the adjoining surface of the wing profile, is approximately 3% of the chord length of the wing profile at this location. The chord is the distance between the front and rear points (in a straight line) of the curve which runs through the profile and is at an equal distance from the underside and the top side of the blade. However, it should be understood that the length value referred to here is only an example. The same applies to the height. According to a preferred embodiment of the invention, the latter is approximately 1% of the chord length. Height is understood as being the distance over which the flap extends from the surface of the blade. In practice, this will mean that a height of this nature is at most 10 cm. The distance between two vortex generators in a series may be selected as a function of the flow conditions and is, for example, 1/10 of the chord length described above.

Apart from a series of vortex generators positioned next to one another, it is also possible to arrange two or more series of generators arranged parallel to one another, i.e. parallel with respect to the longitudinal axis of the blade, on one or both sides of the blade.

It is also possible to optimize the shape of a series of vortex generators. A particularly efficient design is obtained if a series of this type describes a line which extends from the upstream side of the free end in the direction of the attachment end towards the downstream end and then back towards the upstream end again. As a result, a type of U-shaped profile is obtained.

A further advantage involved with positioning the vortex generators in the vicinity of the tip is that it has been found that the installation of vortex generators means that the output does not fall suddenly even at high wind speeds.

In addition to the arrangement of vortex generators, it has been found that it is also possible to reduce a sudden loss in efficiency by allowing the free end of the blade to extend in the upstream direction. The distance over which the free end runs upstream is preferably of the order of magnitude of the chord length of the blade at the location of the bending point. The effect of vortex generators may also be achieved by air jets arranged at an angle; a flow of air is blown outwards through small holes in the profile, at an angle to the principal flow.

The invention will be explained in more detail below with reference to exemplary embodiments illustrated in the drawing, in which: Fig. 1 shows a very diagrammatic view of a very general structure of a wind turbine provided with two blades;

Fig. 2 shows the detail given in Fig. 1 ;

Fig. 3 shows a blade in accordance with Fig. 1 in which the vortex generators are shown positioned on the suction side; and Fig. 4 shows a detailed view, similar to that of Fig. 2, of an amended embodiment of the end of the blade.

In Fig. 1, a wind turbine is denoted overall by 1. It comprises a conventional post on which a machine housing 2 is arranged. From this there extends a shaft (not shown in more detail) which is coupled to a hub 3, to which two blades 4 are attached by means of the associated attachment end 8. The free end of the blades is denoted by 9. The length of the blades provided with a particular flow profile is indicated by L. The attachment part 8 will generally comprise a simple cylindrical pipe which merges smoothly into flow profile L. Naturally, length L is selected as a function of the output to be generated by the wind turbine. An example which may be mentioned is a value of between 5 and 100 metres. According to the invention, particular measures are taken in the encircled region but also outside this region. This region is shown in more detail in Fig. 2. From this figure, it can be seen that the height of this region is 1 and this height is preferably less than 20% of the length L of the blade. The pressure side is indicated by 6, while the suction side is indicated by 5. The upstream side is 10 and the downstream side is 11.

It can be seen from Fig. 2 that in the vicinity of the upstream side there are two series of turbulence-generating generators 12 and 13. In this example, these generators are triangular flaps which have a common base part. They may, for example, be prefabricated as lengths of 1 metre. These vortex generators are preferably in any case arranged on side 5 and may in addition be arranged on side 6. In the example illustrated, a single series is shown each time, but it is also possible to use a number of series which are parallel to one another or even to have an arbitrary arrangement within a defined region. Vortex generators of this type preferably consist of flexible material, so that during transport they can easily be pressed against the corresponding blade without permanent damage occurring while it is ensured that they spring back into the desired position.

Instead of the straight pattern which is known, it is possible to use a U-shaped pattern. This is shown in Fig. 3, and the line followed in this figure bears the reference numeral 14. This pattern increases the output.

Vortex generator patterns of this nature enables the stability of the blade to be improved considerably under different wind conditions, and a more successfully predictable output and improved efficiency can be obtained without a sudden fall in efficiency for a relatively long or short time.

Vortex generators may comprise any material which is known in the prior art. They may, for example, be aluminium parts which are 0.5 mm thick. Fig. 4 shows a further measure which can be used optionally in combination with the measures shown in Figs. 2 and 3. The free end of the blade is bent towards the arriving flow. The length of this bent end is denoted by N and approximately corresponds to the length of the chord C at the location of the said bending point. It should be understood that this measure can be used both in combination with the vortex generators described above and as a stand-alone measure, that is to say without the presence of turbulence-generating generators of this nature in the vicinity of one of the ends.

Although the invention has been described above with reference to preferred embodiments, it will be immediately understood by a person skilled in the art that numerous modifications are possible and lie within the scope of the appended claims.

Claims

1. Blade (4) for a wind turbine or the like, having a part which rotates in a flow of fluid, which blade comprises an attachment end (8), which is connected to the said wind turbine or such part, and a free end (9), which is at a distance from the attachment end, the blade comprising, at least in the vicinity of the free end, a profile which is optimized for a flow of fluid (air), characterized in that adjacent to one of the ends, turbulence-generating members (12, 13) are arranged near that side (10) which lies upstream as seen in the direction of movement of the blade.
2. Blade according to Claim 1, in which the said turbulence-generating members comprise vortex generators.
3. Blade according to one of the preceding claims, in which the said turbulence-generating members comprise air jets in the said blade.
4. Blade according to one of the preceding claims, in which the said optimized profile comprises a pressure side and a suction side and the turbulence-generating generators are arranged at the transition between the furthest upstream part and the pressure side.
5. Blade according to one of the preceding claims, in which the said optimized profile comprises a pressure side and a suction side and the turbulence-generating generators are arranged at the transition between the furthest upstream part and the suction side.
6. Blade according to Claim 2, in which the turbulence-generating profile comprises a flap which, from the blade surface, extends at most 1/3 tip chord measured at 10% of the length of the blade from its free end.
7. Blade according to one of the preceding claims, in which the turbulence- generating profile comprises profiles spaced from one another in the longitudinal direction of the blade.
8. Blade according to one of the preceding claims, in which the turbulence- generating profile comprises a series of turbulence-generating profile parts which are positioned in series.
9. Blade according to Claim 6, in which the said series describes a line (14) which extends from the upstream side (10) of the attachment end, in the direction of the free end, towards the downstream end (11), and then towards the upstream end (10).
10. Blade according to Claim 6 or 7, in which the said series extends from the free end within a region of the blade which forms less than 20% of the length L of the blade.
11. Blade according to one of the preceding claims, in which the free end is provided with a projection (15) projecting in the upstream direction.
12. Wind turbine, comprising a blade according to one of the preceding claims.
PCT/NL2000/000614 1999-09-01 2000-09-01 Blade for a wind turbine WO2001016482A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL1012949A NL1012949C2 (en) 1999-09-01 1999-09-01 Blade for a wind turbine.
NL1012949 1999-09-01

Publications (1)

Publication Number Publication Date
WO2001016482A1 true true WO2001016482A1 (en) 2001-03-08

Family

ID=19769812

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2000/000614 WO2001016482A1 (en) 1999-09-01 2000-09-01 Blade for a wind turbine

Country Status (2)

Country Link
NL (1) NL1012949C2 (en)
WO (1) WO2001016482A1 (en)

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006122547A1 (en) * 2005-05-17 2006-11-23 Vestas Wind Systems A/S A pitch controlled wind turbine blade, a wind turbine and use hereof
DE102006017897A1 (en) * 2006-04-13 2007-10-18 Repower Systems Ag Rotor blade of a wind turbine
WO2007140771A1 (en) * 2006-06-09 2007-12-13 Vestas Wind Systems A/S A wind turbine blade and a pitch controlled wind turbine
WO2008001080A1 (en) * 2006-06-27 2008-01-03 Derek Alan Taylor Device for enhancing the effectiveness of power conversion from wind and other fluids
WO2008113349A2 (en) * 2007-03-20 2008-09-25 Vestas Wind Systems A/S Slow rotating wind turbine rotor with slender blades
WO2008113350A2 (en) * 2007-03-20 2008-09-25 Vestas Wind Systems A/S Wind turbine blades with vortex generators
CN100443720C (en) 2005-11-09 2008-12-17 沈阳航空工业学院 Heavy-camber wind mill airfoil
EP2017467A1 (en) 2007-07-20 2009-01-21 Siemens Aktiengesellschaft Wind turbine rotor blade and pitch regulated wind turbine
EP2031244A1 (en) * 2007-08-31 2009-03-04 Lm Glasfiber A/S Means to maintain flow of a flowing medium attached to the exterior of a flow control member by use of crossing sub-channels
WO2009026928A2 (en) * 2007-08-31 2009-03-05 Lm Glasfiber A/S Wind turbine blade with submerged boundary layer control means
WO2009080316A2 (en) * 2007-12-21 2009-07-02 Vestas Wind Systems A/S Active flow control device and method for affecting a fluid boundary layer of a wind turbine blade
GB2466478A (en) * 2008-12-02 2010-06-30 Aerovortex Mills Ltd Suction generation device
ES2343397A1 (en) * 2008-03-07 2010-07-29 GAMESA INNOVATION & TECHNOLOGY, S.L. A wind turbine blade.
CN101865081A (en) * 2010-07-01 2010-10-20 北京大学 Device for utilizing front edge rudder pieces to adjust output power of rotating blade and method thereof
US8047801B2 (en) 2010-06-23 2011-11-01 General Electric Company Wind turbine blades with aerodynamic vortex elements
US8061986B2 (en) 2010-06-11 2011-11-22 General Electric Company Wind turbine blades with controllable aerodynamic vortex elements
US8167554B2 (en) 2011-01-28 2012-05-01 General Electric Corporation Actuatable surface features for wind turbine rotor blades
CN102454557A (en) * 2010-10-21 2012-05-16 西门子公司 Blade of a wind turbine
DE202012005356U1 (en) 2012-05-30 2012-07-10 Petra Staude Rotor blade for wind turbines with profiles in tandem
EP2484898A1 (en) * 2011-02-04 2012-08-08 LM Wind Power A/S Vortex generator device with tapered sections for a wind turbine
EP2484895A1 (en) * 2011-02-04 2012-08-08 LM Wind Power A/S Vortex generator vane pair with trapezium-shaped base
CN102678479A (en) * 2012-05-15 2012-09-19 哈尔滨工程大学 Guide edge concave-convex fan
CN102705156A (en) * 2011-02-04 2012-10-03 Lm风力发电公司 Mounting of vortex generator devices via mounting plate
EP2548801A1 (en) * 2011-07-22 2013-01-23 LM Wind Power A/S Wind turbine blade comprising vortex generators
WO2013014082A2 (en) 2011-07-22 2013-01-31 Lm Wind Power A/S Wind turbine blade comprising vortex generators
WO2013060722A1 (en) * 2011-10-25 2013-05-02 Lm Wind Power A/S Wind turbine blade provided with slat
EP2604516A3 (en) * 2011-12-13 2013-08-14 Lockheed Martin Corporation Minimally intrusive wingtip vortex wake mitigation using microvane arrays
WO2013120946A1 (en) * 2012-02-17 2013-08-22 Lm Wp Patent Holding A/S Wind turbine blade having a shaped stall fence or flow diverter
JP2014070638A (en) * 2012-09-28 2014-04-21 Siemens Aktiengesellschaft Wind turbine rotor blade
WO2014060446A1 (en) * 2012-10-16 2014-04-24 Wobben Properties Gmbh Wind turbine
EP2799710A1 (en) * 2013-05-03 2014-11-05 General Electric Company Rotor blade assembly having vortex generators for wind turbine
US20150010407A1 (en) * 2013-07-08 2015-01-08 Alonso O. Zamora Rodriguez Reduced noise vortex generator for wind turbine blade
DK178039B1 (en) * 2010-11-16 2015-04-07 Gen Electric Winglet for wind turbine rotor blade
EP2597300B1 (en) 2011-11-23 2015-09-16 Siemens Aktiengesellschaft A wind turbine blade
US20150361951A1 (en) * 2014-06-17 2015-12-17 Siemens Energy, Inc. Pressure side stall strip for wind turbine blade
US9267491B2 (en) 2013-07-02 2016-02-23 General Electric Company Wind turbine rotor blade having a spoiler
EP3031714A1 (en) * 2014-12-12 2016-06-15 Lockheed Martin Corporation Adhesive panels of microvane arrays for reducing effects of wingtip vortices
EP2342453B1 (en) 2008-09-19 2016-11-09 Corten Holding BV Wind turbine with low induction tips
US9494132B2 (en) 2013-05-07 2016-11-15 General Electric Company Airflow modifying assembly for a rotor blade of a wind turbine
US9523279B2 (en) 2013-11-12 2016-12-20 General Electric Company Rotor blade fence for a wind turbine
EP2593670B1 (en) 2010-07-16 2017-01-04 LM WP Patent Holding A/S Wind turbine blade with narrow shoulder and relatively thick airfoil profiles
US9624782B2 (en) 2013-11-11 2017-04-18 General Electric Company Template for aligning surface features on a rotor blade
JP6154050B1 (en) * 2016-08-08 2017-06-28 三菱重工業株式会社 Mounting of the wind turbine blade, the wind turbine rotor and wind turbine generator and a vortex generator
US9752559B2 (en) 2014-01-17 2017-09-05 General Electric Company Rotatable aerodynamic surface features for wind turbine rotor blades
US9777703B2 (en) 2011-07-22 2017-10-03 Lm Wind Power A/S Method for retrofitting vortex generators on a wind turbine blade

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741285A (en) * 1968-07-09 1973-06-26 A Kuethe Boundary layer control of flow separation and heat exchange
US4354648A (en) * 1980-02-06 1982-10-19 Gates Learjet Corporation Airstream modification device for airfoils
US5058837A (en) * 1989-04-07 1991-10-22 Wheeler Gary O Low drag vortex generators
US5255881A (en) * 1992-03-25 1993-10-26 Vigyan, Inc. Lift augmentation for highly swept wing aircraft
US5348253A (en) * 1993-02-01 1994-09-20 Gratzer Louis B Blended winglet
US5598990A (en) * 1994-12-15 1997-02-04 University Of Kansas Center For Research Inc. Supersonic vortex generator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741285A (en) * 1968-07-09 1973-06-26 A Kuethe Boundary layer control of flow separation and heat exchange
US4354648A (en) * 1980-02-06 1982-10-19 Gates Learjet Corporation Airstream modification device for airfoils
US5058837A (en) * 1989-04-07 1991-10-22 Wheeler Gary O Low drag vortex generators
US5255881A (en) * 1992-03-25 1993-10-26 Vigyan, Inc. Lift augmentation for highly swept wing aircraft
US5348253A (en) * 1993-02-01 1994-09-20 Gratzer Louis B Blended winglet
US5598990A (en) * 1994-12-15 1997-02-04 University Of Kansas Center For Research Inc. Supersonic vortex generator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WETZEL K K ET AL: "INFLUENCE OF VORTEX GENERATORS ON NREL S807 AIRFOIL AERODYNAMIC CHARACTERISTICS AND WIND TURBINE PERFORMANCE", WIND ENGINEERING,GB,MULTI-SCIENCE PUBLISHING CO., BRENTWOOD, ESSEX, vol. 19, no. 3, 1 January 1995 (1995-01-01), pages 157 - 165, XP000516437, ISSN: 0309-524X *

Cited By (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006122547A1 (en) * 2005-05-17 2006-11-23 Vestas Wind Systems A/S A pitch controlled wind turbine blade, a wind turbine and use hereof
US7927070B2 (en) 2005-05-17 2011-04-19 Vestas Wind Systems A/S Pitch controlled wind turbine blade, a wind turbine and use thereof
EP1886016B1 (en) 2005-05-17 2017-05-10 Vestas Wind Systems A/S A pitch controlled wind turbine blade having turbulence generating means, a wind turbine and use thereof
CN101223356B (en) 2005-05-17 2012-06-13 维斯塔斯风力系统有限公司 Pitch control type wind turbine blade, wind turbine and its application
CN100443720C (en) 2005-11-09 2008-12-17 沈阳航空工业学院 Heavy-camber wind mill airfoil
DE102006017897A1 (en) * 2006-04-13 2007-10-18 Repower Systems Ag Rotor blade of a wind turbine
DE102006017897B4 (en) * 2006-04-13 2008-03-13 Repower Systems Ag Rotor blade of a wind turbine
US8678746B2 (en) 2006-06-09 2014-03-25 Vestas Wind Systems A/S Wind turbine blade and a pitch controlled wind turbine
US20120189444A1 (en) * 2006-06-09 2012-07-26 Vestas Wind Systems A/S Wind turbine blade and a pitch controlled wind turbine
US8162590B2 (en) 2006-06-09 2012-04-24 Vestas Wind Systems A/S Wind turbine blade and a pitch controlled wind turbine
WO2007140771A1 (en) * 2006-06-09 2007-12-13 Vestas Wind Systems A/S A wind turbine blade and a pitch controlled wind turbine
WO2008001080A1 (en) * 2006-06-27 2008-01-03 Derek Alan Taylor Device for enhancing the effectiveness of power conversion from wind and other fluids
WO2008113349A3 (en) * 2007-03-20 2009-02-26 Vestas Wind Sys As Slow rotating wind turbine rotor with slender blades
WO2008113350A3 (en) * 2007-03-20 2009-02-05 Vestas Wind Sys As Wind turbine blades with vortex generators
US7914259B2 (en) 2007-03-20 2011-03-29 Vestas Wind Systems A/S Wind turbine blades with vortex generators
WO2008113350A2 (en) * 2007-03-20 2008-09-25 Vestas Wind Systems A/S Wind turbine blades with vortex generators
WO2008113349A2 (en) * 2007-03-20 2008-09-25 Vestas Wind Systems A/S Slow rotating wind turbine rotor with slender blades
EP2017467A1 (en) 2007-07-20 2009-01-21 Siemens Aktiengesellschaft Wind turbine rotor blade and pitch regulated wind turbine
US8602739B2 (en) 2007-07-20 2013-12-10 Siemens Aktiengesellschaft Wind turbine rotor blade and pitch regulated wind turbine
US20090028718A1 (en) * 2007-07-20 2009-01-29 Peder Bay Enevoldsen Wind turbine rotor blade and pitch regulated wind turbine
WO2009026928A2 (en) * 2007-08-31 2009-03-05 Lm Glasfiber A/S Wind turbine blade with submerged boundary layer control means
WO2009026928A3 (en) * 2007-08-31 2009-09-17 Lm Glasfiber A/S Wind turbine blade with submerged boundary layer control means
EP2031244A1 (en) * 2007-08-31 2009-03-04 Lm Glasfiber A/S Means to maintain flow of a flowing medium attached to the exterior of a flow control member by use of crossing sub-channels
US8579594B2 (en) 2007-08-31 2013-11-12 Lm Glasfiber A/S Wind turbine blade with submerged boundary layer control means
WO2009026926A1 (en) * 2007-08-31 2009-03-05 Lm Glasfiber A/S Wind turbine blade with submerged boundary layer control means comprisin crossing sub-channels
WO2009080316A2 (en) * 2007-12-21 2009-07-02 Vestas Wind Systems A/S Active flow control device and method for affecting a fluid boundary layer of a wind turbine blade
WO2009080316A3 (en) * 2007-12-21 2010-04-29 Vestas Wind Systems A/S Active flow control device and method for affecting a fluid boundary layer of a wind turbine blade
ES2343397A1 (en) * 2008-03-07 2010-07-29 GAMESA INNOVATION & TECHNOLOGY, S.L. A wind turbine blade.
EP2098721A3 (en) * 2008-03-07 2011-05-04 Gamesa Innovation & Technology, S.L. A wind turbine blade
EP2342453B1 (en) 2008-09-19 2016-11-09 Corten Holding BV Wind turbine with low induction tips
GB2466478A (en) * 2008-12-02 2010-06-30 Aerovortex Mills Ltd Suction generation device
US8061986B2 (en) 2010-06-11 2011-11-22 General Electric Company Wind turbine blades with controllable aerodynamic vortex elements
US8047801B2 (en) 2010-06-23 2011-11-01 General Electric Company Wind turbine blades with aerodynamic vortex elements
EP2400148A3 (en) * 2010-06-23 2012-04-18 General Electric Company Wind turbine blades with aerodynamic vortex elements
CN101865081A (en) * 2010-07-01 2010-10-20 北京大学 Device for utilizing front edge rudder pieces to adjust output power of rotating blade and method thereof
EP2593670B1 (en) 2010-07-16 2017-01-04 LM WP Patent Holding A/S Wind turbine blade with narrow shoulder and relatively thick airfoil profiles
CN102454557A (en) * 2010-10-21 2012-05-16 西门子公司 Blade of a wind turbine
DK178039B1 (en) * 2010-11-16 2015-04-07 Gen Electric Winglet for wind turbine rotor blade
US8167554B2 (en) 2011-01-28 2012-05-01 General Electric Corporation Actuatable surface features for wind turbine rotor blades
CN102705156A (en) * 2011-02-04 2012-10-03 Lm风力发电公司 Mounting of vortex generator devices via mounting plate
EP2484898A1 (en) * 2011-02-04 2012-08-08 LM Wind Power A/S Vortex generator device with tapered sections for a wind turbine
EP2484895A1 (en) * 2011-02-04 2012-08-08 LM Wind Power A/S Vortex generator vane pair with trapezium-shaped base
US9777703B2 (en) 2011-07-22 2017-10-03 Lm Wind Power A/S Method for retrofitting vortex generators on a wind turbine blade
WO2013014082A3 (en) * 2011-07-22 2013-08-22 Lm Wp Patent Holding A/S Wind turbine blade comprising vortex generators
WO2013014082A2 (en) 2011-07-22 2013-01-31 Lm Wind Power A/S Wind turbine blade comprising vortex generators
US20140140856A1 (en) * 2011-07-22 2014-05-22 Lm Wp Patent Holding A/S Wind turbine blade comprising vortex generators
EP2736805B1 (en) 2011-07-22 2017-06-14 LM WP Patent Holding A/S Wind turbine blade comprising vortex generators
CN103987622A (en) * 2011-07-22 2014-08-13 Lm Wp专利控股有限公司 Wind turbine blade comprising vortex generators
EP2548801A1 (en) * 2011-07-22 2013-01-23 LM Wind Power A/S Wind turbine blade comprising vortex generators
WO2013060722A1 (en) * 2011-10-25 2013-05-02 Lm Wind Power A/S Wind turbine blade provided with slat
EP2597300B1 (en) 2011-11-23 2015-09-16 Siemens Aktiengesellschaft A wind turbine blade
US9896192B2 (en) 2011-12-13 2018-02-20 Lockheed Martin Corroration Minimally intrusive wingtip vortex wake mitigation using microvane arrays
EP2604516A3 (en) * 2011-12-13 2013-08-14 Lockheed Martin Corporation Minimally intrusive wingtip vortex wake mitigation using microvane arrays
WO2013120946A1 (en) * 2012-02-17 2013-08-22 Lm Wp Patent Holding A/S Wind turbine blade having a shaped stall fence or flow diverter
CN102678479A (en) * 2012-05-15 2012-09-19 哈尔滨工程大学 Guide edge concave-convex fan
DE202012005356U1 (en) 2012-05-30 2012-07-10 Petra Staude Rotor blade for wind turbines with profiles in tandem
EP2713044B1 (en) 2012-09-28 2017-05-17 Siemens Aktiengesellschaft Wind turbine rotor blade
JP2014070638A (en) * 2012-09-28 2014-04-21 Siemens Aktiengesellschaft Wind turbine rotor blade
JP2015532391A (en) * 2012-10-16 2015-11-09 ヴォッベン プロパティーズ ゲーエムベーハーWobben Properties Gmbh Wind turbine generator
CN104736844A (en) * 2012-10-16 2015-06-24 乌本产权有限公司 Wind turbine
WO2014060446A1 (en) * 2012-10-16 2014-04-24 Wobben Properties Gmbh Wind turbine
EP2799710B1 (en) 2013-05-03 2016-09-07 General Electric Company Rotor blade assembly having vortex generators for wind turbine
EP2799710A1 (en) * 2013-05-03 2014-11-05 General Electric Company Rotor blade assembly having vortex generators for wind turbine
US9494132B2 (en) 2013-05-07 2016-11-15 General Electric Company Airflow modifying assembly for a rotor blade of a wind turbine
US9267491B2 (en) 2013-07-02 2016-02-23 General Electric Company Wind turbine rotor blade having a spoiler
US20150010407A1 (en) * 2013-07-08 2015-01-08 Alonso O. Zamora Rodriguez Reduced noise vortex generator for wind turbine blade
US9624782B2 (en) 2013-11-11 2017-04-18 General Electric Company Template for aligning surface features on a rotor blade
US9523279B2 (en) 2013-11-12 2016-12-20 General Electric Company Rotor blade fence for a wind turbine
US9752559B2 (en) 2014-01-17 2017-09-05 General Electric Company Rotatable aerodynamic surface features for wind turbine rotor blades
CN105298738A (en) * 2014-06-17 2016-02-03 西门子能量股份有限公司 Pressure side stall strip for wind turbine blade
US20150361951A1 (en) * 2014-06-17 2015-12-17 Siemens Energy, Inc. Pressure side stall strip for wind turbine blade
EP3031714A1 (en) * 2014-12-12 2016-06-15 Lockheed Martin Corporation Adhesive panels of microvane arrays for reducing effects of wingtip vortices
US9868516B2 (en) 2014-12-12 2018-01-16 Lockheed Martin Corporation Adhesive panels of microvane arrays for reducing effects of wingtip vortices
JP6154050B1 (en) * 2016-08-08 2017-06-28 三菱重工業株式会社 Mounting of the wind turbine blade, the wind turbine rotor and wind turbine generator and a vortex generator
EP3282120A1 (en) * 2016-08-08 2018-02-14 Mitsubishi Heavy Industries, Ltd. Wind turbine blade, wind turbine rotor, wind turbine power generating apparatus, and method of mounting vortex generator

Also Published As

Publication number Publication date Type
NL1012949C2 (en) 2001-03-06 grant

Similar Documents

Publication Publication Date Title
US6733240B2 (en) Serrated fan blade
US8021100B2 (en) Wind turbine with mixers and ejectors
US6887031B1 (en) Habitat friendly, pressure conversion, wind energy extraction
US4143992A (en) Wind operated power generator
US20060018759A1 (en) Rotor blade
US6910867B2 (en) Blade of a wind turbine
US4080100A (en) Wind motor
US20050271508A1 (en) Flexible turbine blade
US20080095631A1 (en) Vertical Axis Wind Turbine With Twisted Blade or Auxiliary Blade
US7094018B2 (en) Wind power generator
US6116015A (en) Breather outlet
WO2000015961A1 (en) Wind turbine blade with vortex generator
US20070297909A1 (en) Rotor blade for a wind power plant
US20100213716A1 (en) Fluid flow energy concentrator
US6756696B2 (en) Wind power generator
US6638021B2 (en) Turbine blade airfoil, turbine blade and turbine blade cascade for axial-flow turbine
WO2005040559A1 (en) High lift rotor or stator blades with multiple adjacent airfoils cross-section
US6481957B1 (en) Modular wind energy device
US20110018282A1 (en) Wind turbine blade and wind power generator using the same
US6024537A (en) Axial flow fan
US20090016891A1 (en) Wind turbine blade tip vortex breakers
CN1732340A (en) Rotor blade for a wind power plant
US20100209236A1 (en) Impulse turbine for use in bi-directional flows
JP2005105865A (en) Propeller fan
WO2004061298A2 (en) Wind turbine rotor blade with reduced noise emission

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase in:

Ref country code: JP