Rotor blade of a wind turbine

Patent metadata

Field	Value
Publication number	US-9932960-B2
Application number	US-201514829316-A
Country	US
Kind code	B2
Filing date	Aug 18, 2015
Priority date	Feb 19, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A rotor blade ( 5 ) of a wind turbine, which has a profile ( 1 - 4 ) having an upper side (suction side) ( 7 ) and an underside (pressure side) ( 8 ). The profile ( 1 - 4 ) includes a camber line ( 21, 25 ) and a chord ( 18 ) between a leading edge ( 10 ) and a trailing edge ( 11 ) of the profile ( 1 - 4 ). The profile ( 1 - 4 ) has a relative profile thickness of more than 45%. At least one vortex generator ( 50, 50′, 50″, 50 ′″) is disposed, in the region of the profile ( 1 - 4 ), on the suction side ( 7 ) of the rotor blade ( 5 ). The profile ( 1 - 4 ) is provided with a blunt trailing edge. And, The thickness of the trailing edge is between 15% and 70% of the chord length.

First claim

What is claimed is:

1. A rotor blade of a wind turbine, having a profile that has a suction side and a pressure side, wherein the profile comprises a camber line and a chord between a leading edge and a trailing edge of the profile, wherein the profile has a relative profile thickness of more than 49%, wherein at least one vortex generator is disposed on the suction side of the profile in a transition region of the profile where the trailing edge of the profile is blunt and has a thickness of between 15% and 70% of a length of the chord, and wherein the at least one vortex generator has a height that is equal to or less than a height of an air boundary layer that forms on the suction side of the rotor blade when the rotor blade is in operation, said air boundary layer being a layer of air having an air speed that is reduced by at least 1% relative to ambient air speed as a result of friction on a rotor blade surface on the suction side.

2. The rotor blade as claimed in claim 1 , wherein the camber line extends, at least in part beneath the chord, in a direction of the pressure side.

3. The rotor blade as claimed in claim 1 , wherein the at least one vortex generator is disposed in a range of from 5% to 40% of chord length.

4. The rotor blade as claimed in claim 1 , wherein the at least one vortex generator comprises a pair of fins, wherein the fins of the pair of fins are disposed at an angle in relation to each other that is in a range of from 10° to 50°.

5. The rotor blade as claimed in claim 1 , wherein a plurality of vortex generators are provided, which are disposed next to each other, substantially parallel to a longitudinal axis of the rotor blade.

6. The rotor blade as claimed in claim 5 , wherein all of the plurality of vortex generators are disposed at a relative profile depth of 20% to 40% as viewed from the leading edge.

7. The rotor blade as claimed in claim 1 , wherein the camber line is disposed in a portion between 0% and 60% of the profile depth of the profile beneath the chord.

8. The rotor blade as claimed in claim 1 , wherein the camber line is disposed entirely in a portion between 5% and 50% beneath the chord.

9. The rotor blade as claimed in claim 1 , wherein an amount of maximum camber is less than 1.5%.

10. The rotor blade as claimed in claim 1 , wherein a second derivative of the camber line is either 0 or positive from 10% to 40% of a profile depth.

11. The rotor blade as claimed in claim 1 , wherein a position of maximum thickness is less than 35% of the chord length.

12. The rotor blade as claimed in claim 1 , wherein the relative profile thickness is more than 65%.

13. The rotor blade as claimed in claim 1 , wherein a nose radius is provided that is greater than 18% of a profile depth, and wherein the profile is asymmetrical in the nose region.

14. The rotor blade as claimed in claim 1 , wherein the suction side and the pressure side of the profile each have a concave contour, at least in a region from 70% to 100% of the chord length measured from the leading edge.

Assignees

• Senvion Gmbh

Inventors

• Petsche Marc
• Korjahn Christoph Matthias

Classifications

• F05B2240/301

  Cross-section characteristics · CPC title

• F05B2240/32

  with roughened surface · CPC title

• F03D1/0633 Primary

  of the blades · CPC title

• F03D1/0683

  Mechanical Engineering · mapped topic

• Y02E10/721

  Cross-Sectional Technologies · mapped topic