Rotor blade of a wind turbine, having a splitter plate

Patent metadata

Field	Value
Publication number	US-11719224-B2
Application number	US-201916970293-A
Country	US
Kind code	B2
Filing date	Feb 18, 2019
Priority date	Feb 19, 2018
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A rotor blade of a wind turbine, wherein the rotor blade has in particular a splitter plate, which is arranged on the blunt trailing edge of the rotor blade. The splitter plate comprises: a root edge, wherein the root edge is arranged on, in particular along, the trailing edge below a transition from the suction side into the trailing edge, an end edge, wherein the end edge forms a free edge, and a surface between the root edge and the end edge, wherein the surface has at least one curved part between the root edge and the end edge, and at least one part of the surface lies in the shear layer generated by the suction side. A rotor blade of a wind turbine, wherein the rotor blade has in particular a splitter plate, which is arranged on the blunt trailing edge of the rotor blade. The splitter plate comprises: a root edge, wherein the root edge is arranged on, in particular along, the trailing edge below a transition from the suction side into the trailing edge, an end edge, wherein the end edge forms a free edge, and a surface between the root edge and the end edge, wherein the surface has at least one curved part between the root edge and the end edge, and at least one part of the surface lies in the shear layer generated by the suction side.

First claim

The invention claimed is:

1. A rotor blade of a wind turbine, the rotor blade comprising:
a leading edge and a blunt trailing edge;
a suction side and a pressure side between the leading edge and the blunt trailing edge, wherein the suction side generates a shear layer when air flows around during operation of the wind turbine,
wherein the leading edge, the blunt trailing edge, the suction side and the pressure side form a reference system in which the leading edge is arranged in front of the blunt trailing edge and the suction side is arranged above the pressure side, and wherein, in the reference system, a profile chord direction extends from the leading edge to the blunt trailing edge; and
a splitter plate arranged on the blunt trailing edge of the rotor blade, wherein the splitter plate comprises:
a root edge, wherein the root edge is arranged on the blunt trailing edge below a transition from the suction side into the blunt trailing edge;
an end edge, wherein the end edge forms a free edge; and
a plate-shaped body extending between the root edge and the end edge, wherein the plate-shaped body comprises at least one curved part between the root edge and the end edge, and at least one part of the plate-shaped body lies in the shear layer generated by the suction side.

2. The rotor blade as claimed in claim 1 , wherein the curved part of the plate-shaped body lies at least partially in the shear layer.

3. The rotor blade as claimed in claim 2 , wherein a curvature of the curved part that lies in the shear layer is determined based on a determination of a stress capacity of the shear layer.

4. The rotor blade as claimed in claim 2 , wherein the curved part of the plate-shaped body has a clockwise curvature with respect to the profile chord direction of the rotor blade.

5. The rotor blade as claimed in claim 4 , wherein the root edge is at a point on the plate-shaped body of the splitter plate at which the plate-shaped body of the splitter plate is at a maximum distance from a profile chord of the rotor blade.

6. The rotor blade as claimed in claim 4 , wherein a point on the plate-shaped body of the splitter plate at which the plate-shaped body of the splitter plate is at a maximum distance from a profile chord of the rotor blade lies between the root edge and the end edge.

7. The rotor blade as claimed in claim 2 , wherein the curved part of the plate-shaped body has a first part and a second part, wherein the first part and the second part have different curvatures.

8. The rotor blade as claimed in claim 7 , wherein the first part has a counterclockwise curvature with respect to the profile chord direction of the rotor blade, and the second part has a clockwise curvature with respect to the profile chord direction of the rotor blade.

9. The rotor blade as claimed in claim 8 , wherein the second part adjoins the first part in the profile chord direction.

10. The rotor blade as claimed in claim 7 , wherein a transition between the first part and the second part has an edge.

11. The rotor blade as claimed in claim 7 , wherein the second part starts, in the profile chord direction, from at least two thirds of a length of the splitter plate in the profile chord direction.

12. The rotor blade as claimed in claim 9 , wherein the clockwise curvature of the second part in the profile chord direction decreases continuously.

13. The rotor blade as claimed in claim 10 , wherein a point on the plate-shaped body of the splitter plate at which the plate-shaped body of the splitter plate is at a maximum distance from a profile chord of the rotor blade lies in the second part.

14. The rotor blade as claimed in claim 1 , wherein the curved part of the plate-shaped body begins at the root edge.

15. The rotor blade as claimed in claim 1 , wherein the splitter plate has a straight part, and the straight part adjoins the curved part, and ends with the end edge, in the profile chord direction.

16. The rotor blade as claimed in claim 15 , wherein the straight part lies at least partially in the shear layer.

17. The rotor blade as claimed in claim 1 , wherein the blunt trailing edge of the rotor blade has a trailing edge thickness, and a length of the splitter plate between the root edge and the end edge in the profile chord direction is 0.75 to 1.5 times the trailing edge thickness.

18. The rotor blade as claimed in claim 1 , wherein the end edge of the splitter plate lies in the shear layer and is at a greater distance from the profile chord of the rotor blade than the root edge.

19. The rotor blade as claimed in claim 1 , wherein the splitter plate is arranged on the blunt trailing edge of the rotor blade such that the root edge is at a distance from the profile chord of the rotor blade.

20. The rotor blade as claimed in claim 19 , wherein the distance from the profile chord is set such that a part of the splitter plate lies in the shear layer.

21. The rotor blade as claimed in claim 1 , wherein the splitter plate is arranged on the blunt trailing edge of the rotor blade by a hinge.

22. A wind turbine comprising a rotor, and a rotor blade as claimed in claim 1 coupled to the rotor.

23. A splitter plate for use on a rotor blade of a wind turbine, the splitter plate comprising:
a root edge, wherein the root edge is configured for arrangement on a trailing edge of the rotor blade;
an end edge, wherein the end edge forms a free edge; and
a plate-shaped body between the root edge and the end edge, wherein the plate-shaped body has at least one curved part between the root edge and the end edge, and at least one part of the plate-shaped body is suitable for lying located in a shear layer generated by a suction side of the rotor blade while the wind turbine is in operation,
wherein the splitter plate is configured to be secured to a blunt trailing edge of the rotor blade of the wind turbine.

24. A method for optimizing a rotor blade of a wind turbine, the method comprising:
determining a flow pattern of the rotor blade, wherein the determination comprises a determination of a location of a shear layer that is generated by a suction side of the rotor blade while the wind turbine is in operation; and
determining a distance of a root edge of a splitter plate from a profile chord of the rotor blade, and a curvature of the splitter plate, such that at least one part of the splitter plate lies in the shear layer; and
securing the splitter plate to a blunt trailing edge of the rotor blade, wherein the splitter plate comprises:
the root edge, wherein the root edge is arranged on the trailing edge of the rotor blade below a transition from the suction side into the trailing edge;
an end edge, wherein the end edge forms a free edge; and
a plate-shaped body extending between the root edge and the end edge, wherein the plate-shaped body comprises the curvature.

Assignees

• Wobben Properties Gmbh

Inventors

• Kneissl Stefan
• Stemberg Jochen

Classifications

• F03D1/0683 Primary

  Mechanical Engineering · mapped topic

• F03D1/0641

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

• F05B2240/21

  for wind turbines · CPC title

• F05B2240/31

  of changeable form or shape · CPC title

• F03D1/0675 Primary

  of the blades · CPC title