Wind turbine blades with aerodynamic vortex elements

• US 8,047,801 B2
• Filed: 06/23/2010
• Issued: 11/01/2011
• Est. Priority Date: 06/23/2010
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: Herr, Stefan, Fang, Biao, Liu, Xiaoyue
• Primary Examiner(s): Yu; Justine
• Assistant Examiner(s): MCDOWELL, LIAM J
• Application Number:
  US12/821,725
• Publication Number:
  US 20110142673A1
• Time in Patent Office: 496 Days
• Field of Search: 416/235, 416/236.R, 416/237, 416/223.R, 416/241.R
• US Class Current: 416/235
• CPC Class Codes: F03D 1/0633 of the blades
• CPC Class Codes: F03D 1/0675 of the blades
• CPC Class Codes: F05B 2240/122 Vortex generators, turbulators, or the like, for mixing
• CPC Class Codes: F05B 2240/3062 Vortex generators
• CPC Class Codes: F05B 2240/32 with roughened surface
• CPC Class Codes: F05B 2250/192 beveled
• CPC Class Codes: F05B 2250/70 Shape
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

A wind turbine blade had a suction side surface and a pressure side surface. A plurality of vortex elements are formed on at least one of the suction side or the pressure side surfaces. The vortex elements have an upwardly inclined wind face and a downwardly inclined slip face, with the wind face and slip face meeting at a generally open-ended U-shaped ridge that defines side horns. The side horns decrease in height from a forward most portion of the ridge to the suction side surface or pressure side surface.

Claims

1. A wind turbine blade, said blade comprising:

a suction side surface and a pressure side surface;

a plurality of vortex elements configured on at least one of said suction side or said pressure side surfaces; and

,

said vortex elements having an upwardly inclined wind face and a downwardly inclined slip face, said wind face and said slip face meeting at a generally open-ended U-shaped ridge that defines side horns, said side horns decreasing in height from a forward most portion of said ridge to said suction side surface or said pressure side surface, said side horns further having a cross-sectional profile that decreases in width from said forward most portion of said ridge to said suction side surface or said pressure side surface, said vortex elements have a semi-hemispherical crescent shape with a convex wind face and a concave slip face, said U-shaped ridge comprising a continuously curved arc shape.

2. The wind turbine blade as in claim 1, wherein said wind face and said slip face are formed by flat walls disposed at constant angles.

3. The wind turbine blade as in claim 2, wherein said wind face comprises a flat front wall and flat side walls, and said slip face comprises a flat front wall and flat side walls.

4. The wind turbine blade as in claim 1, wherein said vortex elements are defined on said suction side surface at a chord length of between about 15% to about 65%.

5. The wind turbine blade as in claim 1, wherein said vortex elements are closer to a root portion of said blade as compared to a tip portion.

6. The wind turbine blade as in claim 1, wherein said vortex elements are closer to a tip portion of said blade as compared to a root portion.

7. The wind turbine blade as in claim 1, further comprising a plurality of vortex generators configured on at least one of said pressure side surface or said suction side surface in combination with said vortex elements.

8. The wind turbine blade as in claim 1, wherein said vortex elements are formed on said suction side surface and said pressure side surface.

9. A wind turbine, said wind turbine comprising a plurality of turbine blades, at least one of said turbine blades comprising:

a suction side surface and a pressure side surface;

a plurality of vortex elements configured on at least one of said suction side surface or said pressure side surface; and

,

said vortex elements having an upwardly inclined wind face and a downwardly inclined slip face, said wind face and said slip face meeting at a generally open-ended U-shaped ridge that defines side horns, said side horns decreasing in height from a forward most portion of said ridge to said suction side surface or said pressure side surface, said side horns having a cross-sectional profile that decreases in width from said forward most portion of said ridge to said suction side surface or said pressure side surface, said vortex elements have a semi-hemispherical crescent shape with a convex wind face and a concave slip face, said U-shaped ridge comprising a continuously curved arc shape.

10. The wind turbine as in claim 9, wherein said wind face and said slip face are formed by flat walls disposed at constant angles.

11. The wind turbine as in claim 9, wherein said vortex elements are defined on said suction side surface at a chord length of between about 15% to about 65%.

12. The wind turbine as in claim 9, wherein said vortex elements are closer to a root portion of said blade as compared to a tip portion.

13. The wind turbine as in claim 9, wherein said vortex elements are closer to a tip portion of said blade as compared to a root portion.

14. The wind turbine as in claim 9, further comprising a plurality of vortex generators configured on at least one of said pressure side surface or said suction side surface in combination with said vortex elements.

15. The wind turbine as in claim 9, wherein said vortex elements are formed on said suction side surface and said pressure side surface.