초록 ▼

A blade element (42; 44; 46; 48; 150; 250; 350) for mounting on a wind turbine blade (10) is provided. The blade (10) has a longitudinal direction (L) and a chord extending transversely to the longitudinal direction between a leading edge (18) and a trailing edge (20). The blade (10) has an airfoil

A blade element (42; 44; 46; 48; 150; 250; 350) for mounting on a wind turbine blade (10) is provided. The blade (10) has a longitudinal direction (L) and a chord extending transversely to the longitudinal direction between a leading edge (18) and a trailing edge (20). The blade (10) has an airfoil profile with a thickness between a suction side and a pressure side along at least a part of the longitudinal direction (L) and with a position of maximum thickness between the leading edge (18) and the trailing edge (20). The blade element (10) has a shape so that, by mounting in a first longitudinal part of the wind turbine blade (10), it changes the profile of the first longitudinal part from a first airfoil profile (100; 200; 300) with an essentially pointed trailing edge (100; 200; 300) and a first chord length (c11; c21; c31) to a changed airfoil profile with a blunt trailing edge (153; 253; 353). The changed airfoil profile is a truncated profile of an imaginary airfoil profile (160; 260; 360) with an essentially pointed trailing edge and a second chord length (c12; c22; c32), which is larger than the first chord length (c11; c21; c31).

대표청구항 ▼

1. A wind turbine blade and blade element combination comprising: a wind turbine blade (10) having a longitudinal direction (L) and a chord extending transversely to the longitudinal direction between a leading edge (18) and a trailing edge (20), the blade (10) comprising an airfoil profile with a t

1. A wind turbine blade and blade element combination comprising: a wind turbine blade (10) having a longitudinal direction (L) and a chord extending transversely to the longitudinal direction between a leading edge (18) and a trailing edge (20), the blade (10) comprising an airfoil profile with a thickness between a suction side and a pressure side along at least a part of the longitudinal direction and with a position of maximum thickness between the leading edge and the trailing edge, and a blade element (42; 44; 46; 48; 150; 250; 350) mounted at the trailing edge (20) of the blade (10) in a first longitudinal part of the wind turbine blade (10), characterised in that the blade element (10) has a shape so that, when mounted in a first longitudinal part of the wind turbine blade (10), it changes the profile of the first longitudinal part from a first airfoil profile (100; 200; 300) with an essentially pointed trailing edge (100; 200; 300) and a first chord length (c11; c21; c31) to a changed airfoil profile with a blunt trailing edge (153; 253; 353), the changed airfoil profile being a truncated profile of a continuous second airfoil profile (160; 260; 360) with an essentially pointed trailing edge and a second chord length (c12; c22; c32) being larger than the first chord length (c11; c21; c31) wherein the second airfoil profile is coincident with the first airfoil profile in the region of the blade not covered by the blade element, wherein the longitudinal extent of the blade element and the first longitudinal part of the blade is at least 1 meter and wherein the blade element (42; 44; 46; 48; 150; 250; 350), when mounted on the wind turbine blade, extends along at least 5% of the chord. 2. A wind turbine blade and blade element combination according to claim 1, wherein the blade comprises: a profiled contour that when being impacted by an incident airflow generates a lift, the profiled contour being divided into: a root area (30) with a substantially circular profile nearest a root end of the blade, an airfoil area (34) with a lift generating profile and comprising the airfoil profile furthest away from the root end and nearest a tip end, and optionally a transition area (32) between the root area (30) and the airfoil area (34), the profile of the transition area (32) gradually changing in the radial direction from the circular profile of the root area to the lift generating profile of the airfoil area. 3. A wind turbine blade and blade element combination according to claim 2, wherein the blade element is mounted in the airfoil area of the blade only. 4. A wind turbine blade and blade element combination according to claim 1, wherein the thickness of the changed airfoil profile is continuously decreasing from the position of maximum thickness to the blunt trailing edge (153; 253; 353). 5. A wind turbine blade and blade element combination according to claim 1, wherein the blade element comprises a mounting surface (151; 251; 351), a flow surface (152; 252; 353), and a blunt rear edge (153; 253; 353). 6. A wind turbine blade and blade element combination according to claim 5, wherein the mounting surface (151; 251; 351) fits to at least a part of the contour of the blade. 7. A wind turbine blade and blade element combination according to claim 5, wherein the flow surface is continuous. 8. A wind turbine blade and blade element combination according to claim 5, wherein the flow surface is continuously connected to the airfoil profile of the blade. 9. A wind turbine blade and blade element combination according to claim 5, wherein the distance between the mounting surface and the flow surface is increasing towards the blunt rear edge. 10. A wind turbine blade and blade element combination according to claim 1, wherein the longitudinal extent of the blade element and the first longitudinal part of the blade is at least 3 meters. 11. A wind turbine blade and blade element combination according to claim 1, wherein the blunt trailing edge (153; 253; 353) has a thickness, which is at least 5% of the maximum thickness of the blade profile. 12. A wind turbine blade and blade element combination according to claim 1, wherein the blade element (42; 44; 46; 48; 150; 250; 350), when mounted on the wind turbine blade, extends along at least 10% of the chord. 13. A wind turbine blade and blade element combination according to claim 1, wherein the second chord length (c12; c22; c32) is at least 5% larger than the first chord length (c11; c21; c31). 14. A wind turbine blade and blade element combination according to claim 1, wherein the blade element (42; 44; 46; 48; 150; 250; 350) is adapted for mounting on the pressure side of the blade. 15. A wind turbine blade and blade element combination according to claim 1, wherein the blade element is adapted for mounting on the suction side of the blade. 16. A wind turbine blade and blade element combination according to claim 1, wherein the blade element is adapted to being mounted about the trailing edge of the blade, so that a first part of the element extends along the pressure side of the blade, and a second part extends along the suction side of the blade. 17. Wind turbine rotor comprising at least one, preferably three, wind turbine blade and blade element combinations according to claim 1. 18. Wind turbine comprising: a) at least one wind turbine blade and blade element combination according to claim 1; or b) a wind turbine rotor comprising at least one, wind turbine blade and blade element combinations according to claim 1. 19. A wind turbine blade and blade element according to claim 1, wherein the blade element has a wedge-shaped cross-section. 20. A wind turbine rotor comprising three wind turbine blade and blade element combinations according to claim 1. 21. A method of changing the aerodynamic profile of at least a first longitudinal part of a wind turbine blade, characterised in that the method comprises the steps of: a) providing a wind turbine blade with a first airfoil profile in the first longitudinal part of the wind turbine blade and having a leading edge and a trailing edge, the first airfoil profile having an essentially pointed trailing edge and having a first chord length, and b) mounting a blade element on the wind turbine blade at the trailing edge of the first longitudinal part of the blade, the blade element changing the profile of the first longitudinal part to a changed airfoil profile with a blunt trailing edge, the changed airfoil profile being a truncated profile of a continuous second airfoil profile with an essentially pointed trailing edge and having a second chord length being larger than the first chord length wherein the second airfoil profile is coincident with the first airfoil profile in the region of the blade not covered by the blade element. 22. A wind turbine blade and blade element combination comprising: a wind turbine blade (10) having a longitudinal direction (L) and a chord extending transversely to the longitudinal direction between a leading edge (18) and a trailing edge (20), the blade (10) comprising an airfoil profile with a thickness between a suction side and a pressure side along at least a part of the longitudinal direction and with a position of maximum thickness between the leading edge and the trailing edge, and a blade element (42; 44; 46; 48; 150; 250; 350) mounted at the trailing edge (20) of the blade (10) in a first longitudinal part of the wind turbine blade (10), characterised in that the blade element (10) has a shape so that, when mounted in a first longitudinal part of the wind turbine blade (10), it changes the profile of the first longitudinal part from a first airfoil profile (100; 200; 300) with an essentially pointed trailing edge (100; 200; 300) and a first chord length (c11; c21; c31) wherein the second airfoil profile is coincident with the first airfoil profile in the region of the blade not covered by the blade element to a changed airfoil profile with a blunt trailing edge (153; 253; 353), the changed airfoil profile being a truncated profile of a continuous second airfoil profile (160; 260; 360) with an essentially pointed trailing edge and a second chord length (c12; c22; c32) being larger than the first chord length (c11; c21; c31), wherein the thickness of the changed airfoil profile is continuously decreasing from the position of maximum thickness to the blunt trailing edge, and wherein the longitudinal extent of the blade element and the first longitudinal part of the blade is at least 1 meter and wherein the blade element (42; 44; 46; 48; 150; 250; 350), when mounted on the wind turbine blade, extends along at least 5% of the chord.