水下振荡涡流场声散射与调制特性  

Acoustic scattering and modulation characteristics of underwater oscillating flow fields

作　　者：荆晨轩 时胜国 杨德森[1,2,3] JING Chenxuan;SHI Shengguo;YANG Desen(Acoustic Science and Technology Laboratory,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University),Ministry of Industry and Information Technology,Harbin 150001,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨150001 [2]海洋信息获取与安全工业和信息化部重点实验室(哈尔滨工程大学),工业和信息化部,黑龙江哈尔滨150001 [3]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2023年第8期1249-1255,共7页Journal of Harbin Engineering University

基　　金：中央高校基本科研专项资金(3072022TS0501).

摘　　要：本文针对水下振荡涡流场的声散射与调制问题建立了理论模型。采用间断伽辽金数值方法模拟了水下振荡涡流场对声波的散射与调制作用,研究了不同马赫数、不同涡流场尺度与声波波长的尺度波长比和不同涡流场振荡频率与声波频率的频率比条件下水下振荡涡流场对声场散射与调制特性。研究结果表明:声波经过振荡涡流场会产生散射和调制现象;振荡涡流场对声场的散射和调制作用均随着尺度波长比、马赫数增大而增强;散射和调制作用随着频率比降低而增强,随着频率比的降低,散射和调制作用增强速度变小,直至频率比的改变对声场的散射和调制作用几乎没有影响。水下振荡涡流场的声散射与调制能够使散射声场含有涡流特征信息,对水下目标探测与识别具有重要意义。A theoretical model is established to solve the problem of acoustic scattering and modulation of underwater oscillating eddy current fields.The discontinuous Galerkin method is used to numerically simulate the scattering and modulation of the underwater oscillating eddy current field on the acoustic waves.The numerical simulation included the scattering and modulation characteristics of underwater oscillating eddy current fields on sound fields under different Mach numbers,scale-wavelength ratios of eddy current fields to sound wave wavelengths,and frequency ratios of eddy current fields to sound wave frequencies.The results show that sound waves will generate scattering and modulation phenomena when passing through the oscillating eddy current field.The scattering and modulation effects of the oscillating eddy current field on the sound field are enhanced with an increase in the scale-wavelength ratio and Mach number.Meanwhile,the scattering and modulation effects increase with the decrease of the frequency ratio,and the enhancement speed of the scattering and modulation effects reduces with the decrease in the frequency ratio until the frequency ratio variation has minimal effect on the scattering and modulation of the sound field.The acoustic scattering and modulation of underwater oscillating eddy current fields can help the scattered acoustic field obtain eddy current characteristic information,which is of considerable importance to underwater target detection and recognition.

关 键 词：流声耦合 振荡涡流场 散射特性 调制特性 包络 马赫数 尺度波长比 频率比 

分 类 号：O427.2[理学—声学]