Research on the Influence of Gradient Distribution Porous Trailing Edge on Airfoil Self Noise

doi:10.3901/JME.2025.17.150

Abstract

Abstract: Porous media has been proven to be effective in reducing the airfoil noise, but the physical mechanism of the chordwise-varying porous noise reduction and its noise reduction mechanism are not perfect. Nine different types of porous distributions have been designed based on the NACA0012 airfoil, and the scattering characteristics and noise-abatement mechanism of the airfoil under different operating conditions have been investigated and analyzed. The results demonstrate that when the angle of attack and incoming flow velocity are large, the noise reduction effect of the gradient porous trailing edge is better, with a peak noise reduction of 43.68 dB and a maximum total sound pressure level reduction of 19.72 dB. These phenomenon root in the control over the flow characteristics on the upper surface and near the wake. When the pressure difference between the upper and lower surfaces is sufficient to drive the fluid through the porous medium, the fluid will manipulate the flow separation on the upper surface of the airfoil, delay the vortex shedding, reduce the large-scale vortices, control the wake fluctuations, reduce the reverse pressure gradient and reflux zone size, and form a stable shear layer, thus effectively controlling the flow-induced noise sources. Compared to uniformly distributed porous trailing edges, a suitable gradient distributed porous trailing edge can reduce the noise more significantly and can improve the aerodynamic drag and lift.

Key words: airfoil self-noise, porous trailing edge, narrow band single tone, flow control

CLC Number:

V211

GUO Peng, FENG Heying, WANG Yong, PENG Yehui, CUI Panwang, YU Rongke. Research on the Influence of Gradient Distribution Porous Trailing Edge on Airfoil Self Noise[J]. Journal of Mechanical Engineering, 2025, 61(17): 150-160.

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