Noise reduction means for a wind turbine blade, wind turbine blade, wind turbine, and method for noise reduction for a wind turbine blade

Patent metadata

Field	Value
Publication number	US-2022010774-A1
Application number	US-202016927232-A
Country	US
Kind code	A1
Filing date	Jul 13, 2020
Priority date	Jul 13, 2020
Publication date	Jan 13, 2022
Grant date	—

Abstract

Provided is a noise reduction means for a wind turbine blade comprising an active noise reduction device and a passive noise reduction device, wherein the passive noise reduction device comprises at least one serrated edge profile adapted for fixation to a trailing edge of the wind turbine blade, wherein the active noise reduction device comprises at least one unsteady pressure sensor adapted to produce an output signal corresponding to a turbulent flow condition during operation of the wind turbine blade, at least one actuator and a control unit, wherein the sensor is arranged adjacent to a serrated edge of the serrated edge profile and the control unit is adapted to control the actuator in dependence of the output signal of the sensor to emit an anti-noise signal at least partly reducing the noise generated by the wind turbine blade.

First claim

1 . A noise reduction means for a wind turbine blade comprising an active noise reduction device and a passive noise reduction device, wherein the passive noise reduction device comprises at least one serrated edge profile adapted for fixation to a trailing edge of the wind turbine blade, wherein the active noise reduction device comprises at least one unsteady pressure sensor adapted to produce an output signal corresponding to a turbulent flow condition during operation of the wind turbine blade, at least one actuator and a control unit, wherein the sensor is arranged adjacent to a serrated edge of the serrated edge profile and the control unit is adapted to control the actuator in dependence of the output signal of the sensor to emit an anti-noise signal at least partly reducing a noise generated by the wind turbine blade.

2 . The noise reduction means according to claim 1 , wherein the active noise reduction device comprises a plurality of sensors, wherein the sensors are arranged alongside the serrated edge, in particular in one or more rows with each a constant or essentially constant distance between the serrated edge and each of the sensors of the row and/or in one or more rows with each a varying distance between the serrated edge and each of the sensors of the row.

3 . The noise reduction means according to claim 2 , wherein a spacing between two neighbouring sensors alongside the serrated edge is uniform or non-uniform.

4 . The noise reduction means according to claim 1 , wherein the serrated edge profile comprises a plurality of teeth, in particular of triangular teeth, forming the serrated edge.

5 . The noise reduction means according to claim 4 , wherein the serrated profile comprises at least one flow-traversable structure, in particular a comb structure and/or a porous structure, arranged in between two neighbouring teeth.

6 . The noise reduction means according claim 1 , wherein the at least one actuator is arranged on a substrate attachable to the wind turbine blade and/or on an arrangement portion of the serrated edge profile.

7 . The noise reduction means according to claim 1 , wherein the actuator comprises a loudspeaker and/or that the sensor comprises a pressure transducer, in particular a surface pressure transducer and/or a microphone.

8 . The noise reduction means according to claim 1 , wherein the control unit is adapted to use a transfer function describing a relation between the output signal of the sensor at the serrated edge, in particular a filtered combination of the output signals of a plurality of sensors, and a far field noise for determination of the anti-noise signal.

9 . The noise reduction means according to claim 8 , wherein the transfer function is adapted to the serrated edge profile, in particular to a noise generation characteristic of the serrated edge profile.

10 . The noise reduction means according to claim 8 , wherein the transfer function is empirically determined by at least one measurement and/or that the transfer function is stored in a data storage unit of the active noise reduction device.

11 . A wind turbine blade comprising at least one noise reduction means according to claim 1 .

12 . A wind turbine comprising at least one wind turbine blade according to claim 11 .

13 . A method for noise reduction for a wind turbine blade using an active noise reduction device and a passive noise reduction device, wherein the passive noise reduction device comprises at least one serrated edge profile adapted for fixation to a trailing edge of the wind turbine blade, wherein the active noise reduction device comprises at least one unsteady pressure sensor adapted to produce an output signal corresponding to a turbulent flow condition during operation of the wind turbine blade, at least one actuator and a control unit, wherein the sensor is arranged adjacent to a serrated edge of the serrated edge profile and the control unit controls the actuator in dependence of the output signal of the sensor to emit an anti-noise signal at least partly reducing a noise generated by the wind turbine blade.

14 . The method according to claim 13 , wherein the control unit uses a transfer function describing a relation between the output signal of the sensor at the serrated edge, in particular a filtered combination of the output signals of a plurality of sensors, and a far field noise for determination of the anti-noise signal.

15 . The method according to claim 13 , wherein a transfer function adapted to the serrated edge profile, in particular to a noise generation characteristic of the serrated edge profile, and/or a transfer function determined by at least one measurement and/or stored in a data storage unit of the active noise reduction device is used.

Assignees

• Siemens Gamesa Renewable Energy As

Inventors

• Asheim Michael J
• Buck Steven

Classifications

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• F03D1/0633

  of the blades · CPC title

• F03D7/0296 Primary

  to prevent, counteract or reduce noise emissions · CPC title

• F05B2260/962

  by means creating "anti-noise" · CPC title

• F05B2270/333

  Noise or sound levels · CPC title