Wind turbine blade with lift-regulating means in form of slots or holes
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-007/02
F03D-001/06
출원번호
US-0448736
(2008-01-04)
등록번호
US-8807940
(2014-08-19)
우선권정보
DK-2007 00013 (2007-01-05)
국제출원번호
PCT/DK2008/000004
(2008-01-04)
§371/§102 date
20090806
(20090806)
국제공개번호
WO2008/080407
(2008-07-10)
발명자
/ 주소
Grabau, Peter
Bove, Stefano
출원인 / 주소
LM Glasfiber A/S
대리인 / 주소
Nath, Goldberg & Meyer
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
A blade for a wind turbine rotor with a hub is described. The object of the invention is to provide a wind turbine blade of the modern, aerodynamic type with improved regulating properties to enhance the adjustment of the wind turbine to various wind conditions, and where no mechanical parts are nee
A blade for a wind turbine rotor with a hub is described. The object of the invention is to provide a wind turbine blade of the modern, aerodynamic type with improved regulating properties to enhance the adjustment of the wind turbine to various wind conditions, and where no mechanical parts are needed near the tip area. At least one slot or a number of holes arranged in at least one longitudinally extending zone, thereby allowing an interior cavity of the blade to communicate with the exterior. The amount of air emitted from the interior cavity to the exterior is also regulated to alter the aerodynamic properties of the blade.
대표청구항▼
1. A blade (10) for a wind turbine rotor with a hub, the blade extending in a longitudinal direction along a longitudinal axis and having a root area (16) closest to the hub and a tip region furthest away from the hub,the blade (10) along at least a portion of the longitudinal direction of the blade
1. A blade (10) for a wind turbine rotor with a hub, the blade extending in a longitudinal direction along a longitudinal axis and having a root area (16) closest to the hub and a tip region furthest away from the hub,the blade (10) along at least a portion of the longitudinal direction of the blade having an envelope, which defines an airfoil profile having, in normal operation, a pressure side (20) and a suction side (19), and further having a leading edge (18) and a trailing edge (17), which edges define an airfoil chord line extending between them,the blade (10) including adjustable lift-regulating means extending in the longitudinal direction of the blade (10), andactivating means by means of which the lift-regulating means can be adjusted and thus alter the aerodynamic properties of the blade (10),the lift-regulating means being adapted so that by activation of the activating means, the lift can be reduced in a zone extending in the longitudinal direction of the blade (10) from a first position in proximity to the blade tip (14) to a second position between the first position and the root area (16) and this second position being variable in the longitudinal direction of the blade, characterised in that the lift-regulating means are formed of a plurality of adjacent longitudinally extending zones arranged from the tip region of the blade towards the root area on the trailing edge of the blade, each zone comprising at least one slot (12, 13, 15) or a number of holes (42, 43, 45, 52, 53, 55), each zone being controlled by a separate interior cavity, thereby allowing the interior cavity (22, 23, 25) of the blade (10) to communicate with the exterior, and the lift-regulating means being adjustable by means of one or more activating means to regulate the amount of air emitted from the interior cavity (22, 23, 25) to the exterior to alter the aerodynamic properties of the blade (10) such that when the activating means are activated, the lift is minimized. 2. A blade according to claim 1, wherein the longitudinally extending zone is provided at the pressure side (20) of the blade (10). 3. A blade according to claim 1, wherein the at least one slot or group of holes are provided near the trailing edge (17) of the blade. 4. A blade according to claim 1, wherein the lift-regulating means are adjustable by use of pressurised air. 5. A blade according to claim 1, wherein the activating means are one or more valve means (32, 33, 35). 6. A blade according to claim 5, wherein the valve members (32, 33, 35) are adapted to open automatically, when the rotational velocity of the rotor exceeds a predetermined value. 7. A blade according to claim 1, wherein the blade comprises an air intake communicating with the interior (22, 23, 25) of the blade (10). 8. A blade according to claim 7, wherein the intake is provided at the root area (16) of the blade (10). 9. A blade according to claim 1, wherein the interior cavity of the blade comprises a number of individual cavities (22, 23, 25), each communicating with the exterior via separate slots (12, 13, 15) or groups of holes (42, 43, 45, 52, 53, 55), which are provided in separate longitudinal sections of the longitudinal direction of the blade. 10. A blade according to claim 1, wherein the blade comprises load sensors (5) arranged in or on the blade (10) and measuring wind loads in form of for instance wind pressure or strain. 11. A blade according to claim 10, wherein the blade (10) comprises a control system with a control unit (3) connected with the activating means and the load sensors (5), so that the control unit may activate the activating means and thus adjust the amount of air emitted via the at least one slot or groups of holes in accordance with the measurements made by the load sensors (5). 12. A blade according to claim 11, wherein the control system is adapted so that it can be linked with other corresponding blades on the same wind turbine to allow activation of the activating means on the basis of the load measurements from one or more of the other blades. 13. A wind turbine rotor with a plurality of wind turbine blades (10), according to claim 12, said wind turbine rotor including a central control system with a control unit (3), in the rotor hub (8), and connected with the load sensors (5) and activating means of each blade (10) to allow the control unit (3) to adjust the amount of air emitted via the at least one slot or groups of holes of one or more of the blades based on the load measurements from each blade and/or the setting of lift-regulating means. 14. A wind turbine comprising wind turbine blades according to claim 1. 15. A method of controlling a wind turbine according to claim 14, wherein the second position between the first position and the blade root (16) is varied in the longitudinally direction of the blade (10) by adjusting the activating means on the basis of measured loads or measured wind speeds. 16. A method according to claim 15, wherein the blades (10) are pitch-controlled and wherein the rotational speed of the blades is kept substantially constant. 17. The blade of claim 1, wherein each longitudinally extending zone starting from the tip region of the blade is arranged successively away from the leading edge of the blade from a previous adjacent longitudinally extending zone.
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이 특허에 인용된 특허 (6)
Bonnet,Laurent, Blade for a rotor of a wind energy turbine.
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