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Influence of separated vortex on aerodynamic noise of an airfoil blade

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Title: Influence of separated vortex on aerodynamic noise of an airfoil blade
Authors: Sasaki, Soichi / Takamatsu, Hajime / Tsujino, Masao / Tsubota, Haruhiro / Hayashi, Hidechito
Issue Date: Mar-2010
Publisher: Science Press, co-published with Springer-Verlag GmbH
Citation: Journal of Thermal Science, 19(1), pp.60-66; 2010
Abstract: In order to clarify the mechanism by which aerodynamic noise is generated from separated flow around an airfoil blade, the relation between the attack angle and the aerodynamic noise of the blade was analyzed using a wind tunnel experiment and a CFD code. In the case of rear surface separation, the separated vortex which has a large-scale structure in the direction of the blade chord is transformed into a structure that concentrates at the trailing edge with an increase in the attack angle. The aerodynamic noise level then becomes small according to the vortex scale in the blade chord. When the flow is separated at the leading edge, a separated vortex of low pressure is formed at the vicinity of the trailing edge. The pressure fluctuations on the blade surface at the vicinity of the trailing edge become large due to the vortex in the wake. It is considered that the aerodynamic noise level increases when the flow is separated at the leading edge because the separated vortex is causing the fluctuations due to wake vortex shedding.
Keywords: Aerodynamic Noise / Airfoil / Separation / Shear Flow / Vortex
URI: http://hdl.handle.net/10069/24850
ISSN: 10032169
DOI: 10.1007/s11630-010-0060-2
Rights: © Science Press and Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2010 / The original publication is available at www.springerlink.com
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/24850

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