Wind turbine with noise-reducing blade rotor

• US 20070077150A1
• Filed: 09/22/2006
• Published: 04/05/2007
• Est. Priority Date: 09/22/2005
• Status: Abandoned Application

• Current Assignee: Gamesa Innovation and Technology SL (Siemens AG)
• Original Assignee: Gamesa Eolica, S.A. (Siemens AG)
• Inventors: Llorente Gonzalez, Jose
• Application Number:
  US11/526,162
• Publication Number:
  US 20070077150A1
• Time in Patent Office: Days
• US Class Current: 416/223.R
• CPC Class Codes: F03D 1/0608 characterised by their aerodynamic shape
• CPC Class Codes: F05B 2240/301 Cross-section characteristics
• CPC Class Codes: F05B 2260/96 Preventing, counteracting or reducing vibration or noise
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

Wind turbine with a blade rotor (11) which reduces noise by the inclusion of a set (21) of flexible bristles (23), aligned in at least one row, on the trailing edge (15) of the aerodynamic profile of the blades (11) and protruding over it, which allows the pressure fluctuations to be balanced on both sides of the profile of each blade (11) in the direction of the wind flow.

Claims

1. Wind turbine which comprises a blade rotor that drives an electrical generator, having aerodynamic profile blades (11) with a leading edge (13) and a trailing edge (15), characterised by the fact that at least one of the blades (11) has a set (21) of flexible bristles (23), aligned in at least one row, protruding over the trailing edge (15) in order to reduce the noise produced during the movement of the rotor on interaction with the wind.

2. Wind turbine as per vindication 1, characterised by the fact that these flexible bristles (23) form a 90°

angle with the edge of the blade (11) in a lengthways direction.

3. Wind turbine as per vindications 1 or 2, characterised by the fact that the set (21) of flexible bristles (23) is arranged along all of the blade (11).

4. Wind turbine as per vindications 1 or 2, characterised by the fact that the set (21) of flexible bristles (23) is arranged along part of the blade (11) at a length L1 of less that 40% of the total radius of the blade, reaching the tip (17).

5. Wind turbine as per any of vindications 1-4, characterised by the fact that the set (21) of flexible bristles (23) is aligned with the upper surface (27) of the trailing edge (15).

6. Wind turbine as per any of vindications 1-4, characterised by the fact that the set (21) of flexible bristles (23) is aligned with the lower surface (29) of the trailing edge (15).

7. Wind turbine as per any of vindications 1-6, characterised by the fact that the set (21) of flexible bristles (23) is arranged in the form of a brush (31) with a support (33) to which the bristles (23)are fixed.

8. Wind turbines as per vindication 7, characterised by that fact that this support (33) comprises two tapes (35, 37) and an adhesive element (39) as a method for fixing to the blade (11).

9. Wind turbine as per any of vindications 1-8, characterised by the fact that, for a determined bristle (23) thickness, the amount per surface unit of the set (21) allows pressure fluctuations to be balanced on both sides in the flow (F) direction.

10. Wind turbine as per vindication 9, characterised by the fact that the flexible bristles (23) have a circular section diameter of between 0.4 and 0.5 mm.

11. Wind turbine as per any of vindications 1-10, characterised by the fact that the flexible bristles (23) have a constant length (L2) along the blade (11).

12. Wind turbine as per vindication 11, characterised by the fact that on blades of a radius greater than or equal to 24 m. the flexible bristles (23) have a length (L2) which is greater than or equal to 8 cm.

13. Wind turbine as per any of vindications 1-10, characterised by the fact that the flexible bristles (23) have a variable length (L2) along the blade (11).

14. Wind turbine as per any of vindications 1-13 characterised by the fact that the flexible bristles (23) are made from a polymeric material.

15. Wind turbine as per vindication 14, characterised by the fact that the flexible bristles (23) are made from polypropylene (PP).