IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0175414
(2011-07-01)
|
등록번호 |
US-8794919
(2014-08-05)
|
우선권정보 |
EP-10168529 (2010-07-06) |
발명자
/ 주소 |
- Baek, Peter
- Grabau, Peter
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
13 |
초록
▼
The present invention relates to a wind turbine blade for a rotor of a wind turbine having a substantially horizontal rotor shaft. The blade may comprise a profiled contour comprising a pressure side and a suction side as well as a leading edge and a trailing edge, a chord extending between the lead
The present invention relates to a wind turbine blade for a rotor of a wind turbine having a substantially horizontal rotor shaft. The blade may comprise a profiled contour comprising a pressure side and a suction side as well as a leading edge and a trailing edge, a chord extending between the leading edge and the trailing edge, and the profiled contour generating a lift when being impacted by an incident airflow. In a cross section of the wind turbine blade perpendicular to a lengthwise direction of the wind turbine blade, a suction side point is defined on the suction side at the trailing edge of the blade, and a pressure side point is defined on the pressure side at the trailing edge of the blade. The suction side point is movable in relation to the pressure side point, and the blade is further provided with a displacement device configured to displace the pressure side point and the suction side point so that a distance between the suction side point and the pressure side point can be varied. The present invention further relates to a wind turbine including such a wind turbine blade and to a method of operating a wind turbine including such a wind turbine blade.
대표청구항
▼
1. A wind turbine blade for a rotor of a wind turbine having a substantially horizontal rotor shaft, the blade comprising: a profiled contour comprising a pressure side and a suction side as well as a leading edge and a trailing edge, a chord extending between the leading edge and the trailing edge,
1. A wind turbine blade for a rotor of a wind turbine having a substantially horizontal rotor shaft, the blade comprising: a profiled contour comprising a pressure side and a suction side as well as a leading edge and a trailing edge, a chord extending between the leading edge and the trailing edge, the profiled contour generating a lift when being impacted by an incident airflow,in a cross section of the wind turbine blade perpendicular to a lengthwise direction of the wind turbine blade,a suction side point being defined on the aft-most point of the suction side at the trailing edge of the blade, anda pressure side point being defined on the aft-most point of the pressure side at the trailing edge of the blade, wherein the suction side and pressure side of the blade are flexible such that the suction side is movable in relation to the pressure side via a displacement device configured to displace the pressure side and the suction side so that a distance between the suction side point and the pressure side point can be varied between a closed, first state, where the suction side point and the pressure side point are connected, and an open, second state, where the suction side point and the pressure side point are spaced apart. 2. The wind turbine blade according to claim 1, wherein the displacement device comprises a wedge-shaped device being movable along the chord so that the distance between the suction side point and the pressure side point is increased when the wedge-shaped device is moved in a direction away from the leading edge. 3. A wind turbine blade according to claim 1, wherein the displacement device comprises a flexible membrane defining an interior volume that may be expanded in volume by admitting a fluid to the interior volume. 4. A wind turbine blade according to claim 3, wherein the fluid is an inert gas. 5. A wind turbine blade according to claim 3, wherein the fluid is water or oil. 6. A wind turbine blade according to claim 1, wherein the displacement device comprises movable bars, wherein the bars are connected to the suction side and the pressure side, respectively, so that change in the length of a bar translates to a change in a relative position between the suction side point and/or pressure side point. 7. A wind turbine blade according to claim 1, further comprising a flow sensor configured to determine inflow conditions at the wind turbine blade or at an upwind direction of the wind turbine blade. 8. A wind turbine blade according to claim 1, further comprising a control unit configured to control the operation of the displacement device in response to inflow condition information from a flow sensor configured to determine inflow conditions at the wind turbine blade or at an upwind direction of the wind turbine blade and/or an external source providing information regarding the wind and/or flow conditions at the wind turbine blade. 9. A wind turbine blade according to claim 1, wherein the wind turbine blade in the radial direction is divided into a root region with a substantially circular or elliptical profile closest to a root end of the blade, an airfoil region with a lift generating profile nearest a tip end of the blade, and preferably a transition region between the root region and the airfoil region, the transition region having a profile gradually changing in the radial direction from the circular or elliptical profile of the root region to the lift generating profile of the airfoil region, and the displacement device being located in the airfoil region. 10. A wind turbine blade according to claim 1, wherein the displacement device is adopted to vary the lift of the cross-section with at least 20%. 11. A wind turbine blade according to claim 1, wherein the displacement device is adopted to vary the lift of the cross-section with at least 30%. 12. A wind turbine blade according to claim 1, wherein the displacement device is adopted to vary the lift of the cross-section with at least 40%. 13. A wind turbine blade according to claim 1, wherein the blade comprises a plurality of displacement devices located in separate lengthwise sections of the blade, the displacement devices being separately controllable. 14. A wind turbine comprising: a tower having a first end and an opposite second end, the second end connecting the tower to the ground or a foundation,a nacelle arranged at the first end of the tower and having a substantially horizontal rotor shaft, a hub connected to the rotor shaft, anda number, preferably two or three, wind turbine blades according to claim 1, extending in a substantially radial direction from the hub. 15. A wind turbine according to claim 14, wherein the wind turbine or the wind turbine blade comprises a sensor for measuring operational conditions, and a control device for controlling the displacement device in response to measurements from the sensor. 16. A method of controlling a wind turbine comprising a wind turbine blade, wherein the blade comprises: a profiled contour comprising a pressure side and a suction side as well as a leading edge and a trailing edge, a chord extending between the leading edge and the trailing edge, the profiled contour generating a lift when being impacted by an incident airflow,in a cross section of the wind turbine blade perpendicular to a lengthwise direction of the wind turbine blade,a suction side point being defined on the aft-most point of the suction side at the trailing edge of the blade, anda pressure side point being defined on the aft-most point of the pressure side at the trailing edge of the blade, wherein the suction side and pressure side of the blade are flexible such that the suction side is movable in relation to the pressure side via a displacement device configured to displace the pressure side point and the suction side point so that a distance between the suction side point and the pressure side point can be varied between a close, first state, where the suction side point and the pressure side point are connected, and an open, second state, where the suction side point and the pressure side point are spaced apart, wherein the method comprises the step of:a) controlling the displacement device so as to vary the distance between the suction side point and the pressure side point so as to vary the lift of a lengthwise section of the blade comprising the displacement device. 17. A method according to claim 16, wherein the method further comprises the step of: b) determining an operational condition of the wind turbine, with respect to inflow properties or load conditions, and carrying out step a) in dependence on the operational condition.
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