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Modification of Flow Structure and sound Source by Hybrid Porous-serrated Trailing Edge

Journal of Bionic Engineering 2020年第3期17卷 539-552页

作者： Hanru Liu Nanshu Chen Yangang Wang Zhijie Hu School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Key Laboratory of Aerodynamic Noise Control Mianyang 621000China

The effects of hybrid porous-serrated trailing edge on flow structure and sound source of NACA65(12)-10 at moderate Reynolds number(Rec=5×1O^5)have been investigated by Delayed Detached Eddy Simulation(DDES).Compared with conventional serrated trailing edge,the pressure fluctuation in the vicinity of hybrid porous-serrated trailing edge is further decreased *** typical necklace vortex structures stretching across adjacent serrations are suppressed by the porous *** is found that porous media changes the shear stress distribution along the serration edge and inside the serration gap,which consequently eliminates the generation of necklace ***,the deformation of vortex tube caused by velocity vector is *** underlying mechanisms associated to the sound source modification are analyzed based on vortex sound *** magnitude of Lamb vector and the angle between vorticity and velocity vectors are synchronously reduced by the porous additive,which implies that the present hybrid porous-serrated trailing edge has important influence on the further attenuation of far-field aerodynamic noise.

关键词： bionic flow control wake modification hybrid porous-serration vortex sound theory noise reduction

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sound Source Measurement of a Semi-Circular Cylinder in a Uniform Flow by Particle Image Velocimetry

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Journal of Flow Control, Measurement & Visualization 2016年第4期4卷 162-170页

作者： Yasuyuki Oguma Nobuyuki Fujisawa Department of Mechanical Engineering Nihon University Koriyama Japan Flow Visualization Research Center Niigata University Niigata Japan

In this paper, the measurement of an aerodynamic sound source for a semi-circular cylinder in a uniform flow is described using Particle Image Velocimetry (PIV). This experimental technique is based on vortex sound theory, where the time derivative of vorticity is evaluated with the aid of two sets of standard PIV systems. The experimental results indicate that the sound source for the semi-circular cylinder is located around the shear layer near the edge of the semi-circular cylinder. The sound source intensity and the area are reduced in the semi-circular cylinder compared with those of a circular cylinder. This result indicates that the aerodynamic sound of the semi- circular cylinder is smaller than that of the circular cylinder, which supports the microphone measurement result.

关键词： Aerodynamic Noise sound Source Semi-Circular Cylinder vortex sound theory Particle Image Velocimetry

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