Rotor blade and wind turbine

Patent metadata

Field	Value
Publication number	US-2022228551-A1
Application number	US-202017611104-A
Country	US
Kind code	A1
Filing date	May 15, 2020
Priority date	May 17, 2019
Publication date	Jul 21, 2022
Grant date	—

Abstract

A rotor blade of a wind turbine that has a Gurney flap, to an associated wind turbine, and to an associated method. A rotor blade for a wind turbine, having a rotor blade length, having a rotor blade depth which extends over the rotor blade length, having a rotor blade thickness which extends over the rotor blade length, and having a thickness of a trailing edge of the rotor blade, which thickness extends over the rotor blade length, said rotor blade comprising a Gurney flap, which has a height which extends over the rotor blade length, wherein the height of the Gurney flap is dimensioned according to the thickness of the trailing edge in such a way that a ratio of the height of the Gurney flap and the thickness of the trailing edge is between greater than 0% and 25%, in particular between 5% and 25%.

First claim

1 . A rotor blade for a wind turbine comprising:
a rotor blade rotor blade body having a rotor blade length, a rotor blade depth that extends over the rotor blade length, and a rotor blade thickness that extends over the rotor blade length, the rotor blade body having a thickness of a trailing edge, wherein the thickness extends over the rotor blade length a Gurney flap, having a height that extends over the rotor blade length, wherein the height of the Gurney flap is dimensioned according to the thickness of the trailing edge in such a way that a ratio of the height of the Gurney flap and the thickness of the trailing edge is between 0% and 25%.

2 . The rotor blade as claimed in claim 1 , comprising a rotor blade flange, wherein from the rotor blade flange, the ratio of the height of the Gurney flap and the thickness of the trailing edge increases to a maximum value.

3 . The rotor blade as claimed in claim 1 , wherein the maximum value of the ratio of the height of the Gurney flap and the thickness of the trailing edge is between 5% and 15% of a relative blade length.

4 . The rotor blade as claimed in claim 1 , wherein the Gurney flap is arranged on the rotor blade body between 3% and 35% of the relative blade length.

5 . The rotor blade as claimed in claim 1 , wherein the Gurney flap is arranged on a pressure side of the rotor blade.

6 . The rotor blade as claimed in claim 1 , wherein an angle between the height of the Gurney flap and a profile chord of the rotor blade is between 90° and 170°.

7 . The rotor blade as claimed in claim 1 , wherein, at a position of the rotor blade length, a ratio of the height of the Gurney flap and the rotor blade depth is greater than 1%.

8 . The rotor blade as claimed in claim 1 , wherein the ratio of the height of the Gurney flap and the thickness of the trailing edge is between
4% and 25%, in a range between 0% and 5% of the relative blade length, and/or 4% and 25%, in a range between 5% and 10% of the relative blade length; and/or 0% and 25% in a range between 10% and 15% of the relative blade length; and/or 0% and 23% in a range between 15% and 20% of the relative blade length; and/or 0% and 20% in a range between 20% and 25% of the relative blade length; and/or 0% and 15% in a range between 25% and 30% of the relative blade length; and/or 0% and 10% in a range between 30% and 35% of the relative blade length.

9 . The rotor blade as claimed in claim 1 comprising a flat back profile with or without rounded edge regions, and the thickness of the trailing edge is defined as a distance between a profile contour of the pressure side and a profile contour of a suction side orthogonal to the profile chord.

10 . The rotor blade as claimed in claim 1 comprising a closed profile, and wherein the thickness of the trailing edge is defined as the distance between a profile contour of the pressure side and a profile contour of the suction side orthogonal to the profile chord at that point of the rotor blade depth at which a free pressure-side flow prevails during operation.

11 . The rotor blade as claimed in claim 1 , comprising a transition region, wherein the transition region comprises a section with a flat back profile and a section with a circular-cylindrical profile, wherein the section with the circular-cylindrical profile faces the rotor blade flange, and wherein the Gurney flap is arranged in the transition region.

12 . The rotor blade as claimed in claim 1 , wherein the Gurney flap extends in a direction of the height from a root point to a tip point, and/or the Gurney flap has, orthogonal to a direction of the height, a thickness oriented substantially parallel to the profile chord of the rotor blade, wherein the Gurney flap extends in a longitudinal direction orthogonally to the direction of the height and orthogonally to the thickness, and an areal extent is formed by the extent in the longitudinal direction and the height.

13 . The rotor blade as claimed in claim 1 , comprising at least one of a blade adapter or a blade extension, wherein the at least one of the blade adapter or the blade extension has the rotor blade flange.

14 . A wind turbine comprising a nacelle and a rotor blade as claimed in claim 1 .

15 . A wind farm comprising at least two wind turbines as claimed in claim 14 .

16 . A method for forming a rotor blade of a wind turbine, the method comprising:
forming a rotor blade body having a rotor blade length, a rotor blade depth that extends over the rotor blade length, a rotor blade thickness that extends over the rotor blade length, and a thickness of a trailing edge of the rotor blade, wherein the thickness extends over the rotor blade length, wherein the forming comprises providing a Gurney flap having a height that extends over the rotor blade length, wherein the height of the Gurney flap is dimensioned according to the thickness of the trailing edge in such a way that a ratio of the height of the Gurney flap and the thickness of the trailing edge is between greater than 0% and 25%.

17 . The method as claimed in claim 16 wherein the ratio is between 5% and 25%.

18 . The rotor blade as claimed in claim 2 the is between 5% and 25%.

19 . The rotor blade as claimed in claim 3 wherein the maximum value of the ratio of the height of the Gurney flap and the thickness of the trailing edge is between 6% and 12% of the relative blade length.

Assignees

• Wobben Properties Gmbh

Inventors

• Maass Hauke
• Stemberg Jochen

Classifications

• F05B2230/50

  Building or constructing in particular ways · CPC title

• F03D1/0641 Primary

  of the section profile of the blades, i.e. aerofoil profile · CPC title

• F03D1/0675 Primary

  of the blades · CPC title

• F05B2250/70

  Shape · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title