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Influence of separated vortex on aerodynamic noise of an airfoil blade

Influence of separated vortex on aerodynamic noise of an airfoil blade,10.1007/s11630-010-0060-2,Journal of Thermal Science,Soichi Sasaki,Hajime Takam

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Influence of separated vortex on aerodynamic noise of an airfoil blade   (Citations: 1)
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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.
Journal: Journal of Thermal Science - J THERM SCI , vol. 19, no. 1, pp. 60-66, 2010
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    • ...In this regard, using wind tunnel experiment and numerical simulation, authors previously analyzed the relationship between a separated flow around an airfoil blade and aerodynamic noise [2]...
    • ...[2], which details a wind tunnel experiment on the wake characteristics of an airfoil blade, the relationship between the width of wake D * in a separated flow and the scale of vortex d becomes d = 0.8 D * . From the above...

    Soichi Sasaki, et al. Prediction of aerodynamic noise in a ring fan based on wake characteri...

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