Research on the Characteristics of Flow Noise Induced by Fish-like Flexible Deformation Motion

doi:10.3969/j.issn.1000-1093.2017.01.016

Abstract

Abstract: Fish swimming has the characteristics of low noise, high efficiency, and the swing of fish body can be abstracted as a flexible wall deformation motion. Flexible deformation can induce a complex vortex structure in the flow field, of which the flow noise formation mechanism and characteristics are different from the conventional problems in a large extent. The NACA0012 airfoil developed by National Advisory Committee for Aeronautics is used as the research object. Considering the demand of flow noise calculation, a numerical model based on the acoustic analogy theory is set up to simulate the flexible deformation, revealing the mechanism of the effect of the flexible deformation on noise characteristics, and radiation directivity of flow noise is obtained. The results indicate that the complex vortex structure evolution induced by flexible deformation is the major source of flow noise; the total sound pressure levels at different orientations decrease with the increase in distance; the total sound pressure level tends to be maximum just above and below the flexible deformation wall, and the noise radiation directivity is most similar to the radiation directivity of a dipole source. Key

Key words: acoustics, flexibledeformation, acousticanalogytheory, flownoise

CLC Number:

O427.5

WANG Ya-dong, YANG Xiao-guang, ZHANG Ji-hua. Research on the Characteristics of Flow Noise Induced by Fish-like Flexible Deformation Motion[J]. Acta Armamentarii, 2017, 38(1): 123-128.

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第38卷
第1期2017 年1月兵工学报ACTA
ARMAMENTARIIVol.38No.1Jan.2017

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