仿鱼体柔性变形运动流噪声特性研究

doi:10.3969/j.issn.1000-1093.2017.01.016

摘要/Abstract

摘要： 鱼类游动具有低噪声、高效率等特点，鱼体摆动可抽象并表征为壁面的柔性变形运动。柔性变形将诱导产生复杂的涡系流场结构，其流噪声的形成机理及特性在很大程度上有别于常规问题。以美国国家航空咨询委员会开发的NACA0012翼型为研究对象，考虑流噪声计算的需求，建立可模拟柔性变形的数值模型。基于声类比理论获得其流噪声特性，揭示柔性变形对流噪声的影响机制，获得流噪声辐射场指向性。结果表明：柔性变形运动诱发的复杂涡系流场演变是流噪声的主要来源；不同方位下流噪声总声压级随距离的增加均呈衰减趋势；在柔性变形壁面正上方和正下方，辐射噪声达到极值，噪声指向与偶极子声源的辐射场特性最为相似。

关键词: 声学, 柔性变形, 声类比法, 流噪声

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

中图分类号:

O427.5

王亚东，杨晓光，张纪华. 仿鱼体柔性变形运动流噪声特性研究[J]. 兵工学报, 2017, 38(1): 123-128.

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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