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Trailing edge noise reduction of wind turbine blades by active flow control

Trailing edge noise reduction of wind turbine blades by active flow control
Trailing edge noise reduction of wind turbine blades by active flow control
In the current study, we investigate a route to reduction of the turbulent boundary layer–trailing edge interaction noise. The trailing edge noise is generated by surface pressure fluctuations beneath a turbulent boundary and scattered at the trailing edge of wind turbine blades. Trailing edge noise is considered to be the dominant noise source of modern wind turbines. Therefore, efforts are constantly made to attenuate the noise. Today, noise emission can be reduced by proper airfoil design or passive devices, such as trailing edge serrations. A further improved candidate technology for trailing edge noise attenuation is active flow control in the form of wall-normal suction. With active flow control, the boundary layer features responsible for trailing edge noise generation can be manipulated, and correspondingly the trailing edge noise can be reduced. Detailed experimental investigations were performed at the Universities of Tel-Aviv and Stuttgart. The tests showed that steady wall-normal suction has a positive effect on the trailing edge noise by reducing the boundary layer thickness, and with it the integral length scales of the eddies within the boundary layer.
trailing edge noise, active flow control, noise control, suction, wind turbine
1095-4244
Wolf, Alexander
2432e8a1-7ac2-42f8-ad4f-387687b04ec8
Lutz, Thorsten
daabff3d-af7a-4693-924b-359b224b2628
Würz, Werner
1e5a4433-d8e6-48e6-b5a2-52c017ca4b33
Krämer, Ewald
ca1990b1-4ddf-4109-81b1-47a0879174aa
Stalnov, Oksana
6ca7508b-4d32-4e46-9158-ef8f03795ece
Seifert, Avraham
5fa00ae2-672d-4d86-8d0d-48106c697169
Wolf, Alexander
2432e8a1-7ac2-42f8-ad4f-387687b04ec8
Lutz, Thorsten
daabff3d-af7a-4693-924b-359b224b2628
Würz, Werner
1e5a4433-d8e6-48e6-b5a2-52c017ca4b33
Krämer, Ewald
ca1990b1-4ddf-4109-81b1-47a0879174aa
Stalnov, Oksana
6ca7508b-4d32-4e46-9158-ef8f03795ece
Seifert, Avraham
5fa00ae2-672d-4d86-8d0d-48106c697169

Wolf, Alexander, Lutz, Thorsten, Würz, Werner, Krämer, Ewald, Stalnov, Oksana and Seifert, Avraham (2014) Trailing edge noise reduction of wind turbine blades by active flow control. Wind Energy. (doi:10.1002/we.1737).

Record type: Article

Abstract

In the current study, we investigate a route to reduction of the turbulent boundary layer–trailing edge interaction noise. The trailing edge noise is generated by surface pressure fluctuations beneath a turbulent boundary and scattered at the trailing edge of wind turbine blades. Trailing edge noise is considered to be the dominant noise source of modern wind turbines. Therefore, efforts are constantly made to attenuate the noise. Today, noise emission can be reduced by proper airfoil design or passive devices, such as trailing edge serrations. A further improved candidate technology for trailing edge noise attenuation is active flow control in the form of wall-normal suction. With active flow control, the boundary layer features responsible for trailing edge noise generation can be manipulated, and correspondingly the trailing edge noise can be reduced. Detailed experimental investigations were performed at the Universities of Tel-Aviv and Stuttgart. The tests showed that steady wall-normal suction has a positive effect on the trailing edge noise by reducing the boundary layer thickness, and with it the integral length scales of the eddies within the boundary layer.

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More information

Published date: 17 March 2014
Keywords: trailing edge noise, active flow control, noise control, suction, wind turbine
Organisations: Aeronautics, Astronautics & Comp. Eng

Identifiers

Local EPrints ID: 363405
URI: http://eprints.soton.ac.uk/id/eprint/363405
ISSN: 1095-4244
PURE UUID: 1fbceed0-cea2-43c1-984d-9e72b33274fd

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Date deposited: 24 Mar 2014 12:34
Last modified: 16 Jul 2019 21:09

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Contributors

Author: Alexander Wolf
Author: Thorsten Lutz
Author: Werner Würz
Author: Ewald Krämer
Author: Oksana Stalnov
Author: Avraham Seifert

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