Tip extension assembly for a wind turbine rotor blade

Patent metadata

Field	Value
Publication number	US-10100805-B2
Application number	US-201514880346-A
Country	US
Kind code	B2
Filing date	Oct 12, 2015
Priority date	Oct 12, 2015
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

The present disclosure is directed to a tip extension assembly for a rotor blade of a wind turbine. The tip extension assembly includes a tip extension having a body with a pressure side surface and a suction side surface. Further, the tip extension is slidable onto a tip of the rotor blade so as to overlap the rotor blade adjacent the tip. In addition, the tip extension defines an extended trailing edge of the rotor blade. Moreover, an edge of the tip extension defines a step profile at a transition region between the tip extension and a trailing edge of the rotor blade. The tip extension assembly also includes at least one chord extension configured for attachment adjacent to the edge of the tip extension so as to minimize the step profile and associated noise caused thereby.

First claim

What is claimed is:

1. A tip extension assembly for a rotor blade of a wind turbine, the tip extension assembly comprising:
a tip extension comprising a body having a pressure side surface and a suction side surface, the tip extension being slidable onto a tip of the rotor blade so as to overlap the rotor blade adjacent the tip, the tip extension defining an extended trailing edge of the rotor blade, wherein a root-side edge of the tip extension that faces a blade root of the rotor blade defines a step profile at a transition region between the tip extension and a trailing edge of the rotor blade; and,
a first chord extension comprising a root-side end facing the blade root and a tip-side end facing a blade tip of the rotor blade, the first chord extension configured for attachment to at least one of a pressure side or a suction side of the rotor blade, the tip-side end of the first chord extension spaced apart from the root-side edge of the tip extension in a span-wise direction to define a fixed span-wise gap between the tip-side end of the first chord extension and the root-side edge of the tip extension so as to minimize the step profile.

2. The tip extension assembly of claim 1 , wherein the first chord extension tapers towards an outer surface of the rotor blade.

3. The tip extension assembly of claim 1 , wherein the root-side end of the first chord extension extends to an inboard location of the rotor blade, wherein the inboard location minimizes noise generated by the step profile.

4. The tip extension assembly of claim 1 , further comprising a plurality of additional chord extensions aligned along a span of the rotor blade.

5. The tip extension assembly of claim 4 , further comprising a span-wise gap between each of the plurality of additional chord extensions.

6. The tip extension assembly of claim 4 , wherein at least one of the first chord extension or one or more of the plurality of additional chord extensions comprises an aerodynamic feature.

7. The tip extension assembly of claim 6 , wherein the aerodynamic feature comprises a serrated edge.

8. The tip extension assembly of claim 1 , wherein the first chord extension comprises at least one of a pressure side surface or a suction side surface.

9. A rotor blade for a wind turbine, comprising:
a blade root, a blade tip, a pressure side, and a suction side, the pressure side and the suction side extending between a leading edge and a trailing edge; and,
a tip extension slid onto and overlapping the blade tip so as to define an extended trailing edge of the rotor blade, the tip extension comprising a body having a pressure side surface and a suction side surface, wherein a root-side edge of the tip extension that faces the blade root defines a step profile at a transition region between the tip extension and the trailing edge of the rotor blade; and,
a first chord extension secured to at least one of the pressure side or the suction side of the rotor blade, the first chord extension comprising a root-side end facing the blade root and a tip-side end facing the blade tip, the first chord extension spaced apart from the root-side edge of the tip extension in a span-wise direction to define a fixed span-wise gap between the tip-side end of the first chord extension and the root-side edge of the tip extension so as to minimize the step profile.

10. The rotor blade of claim 9 , wherein the first chord extension tapers towards an outer surface of the rotor blade.

11. The rotor blade of claim 9 , further comprising a plurality of additional chord extensions aligned along a span of the rotor blade, wherein at least one of the first chord extension or one or more of the plurality of additional chord extensions comprises a serrated edge.

12. The rotor blade of claim 11 , further comprising a span-wise gap between each of the plurality of additional chord extensions.

13. The rotor blade of claim 9 , wherein the first chord extension comprises a pressure side surface and a suction side surface, the pressure side surface being secured to the pressure side of the rotor blade and the suction side surface being secured to the suction side of the rotor blade.

Assignees

• Gen Electric
• General Electric Compant

Inventors

• Tobin James Robert
• Gobeli William Max
• Herr Stefan

Classifications

• F05B2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F05B2230/80

  Repairing, retrofitting or upgrading methods · CPC title

• F03D1/0658 Primary

  Arrangements for fixing wind-engaging parts to a hub · CPC title

• F03D1/0675

  of the blades · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title