基于LES/FW-H耦合模型的水下高速运动体流噪特性分析  

Analysis of flow noise characteristics of underwater high speed moving object based on LES/FW-H coupling model

作　　者：屠江锋 马少杰[1] 张合[1] 宋斌[2] Tu Jiangfeng;Ma Shaojie;Zhang He;Song Bin(National Defense Key Discipline Laboratory of Intelligent Amunition Technology,Nanjing University ofScience and Technology,Nanjing 210094,China;PLA 63850,Baicheng 137001,China)

机构地区：[1]南京理工大学智能弹药技术国防重点学科实验室,江苏南京210014 [2]中国人民解放军63850部队,吉林白城137001

出　　处：《南京理工大学学报》2020年第2期142-148,153,共8页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(51275248)。

摘　　要：空化未出现时,水下运动体的流动噪声以结构噪声、机械噪声、仪器噪声等为主,这些噪声主要以多极子形式辐射,线谱与宽谱共存,且随流速与环境压力而变化。而空化一旦发生,水下运动体流动噪声的噪声谱产生明显变化。为研究水下高速运动体噪声特性,以平头回转体为研究对象,基于流体体积(VOF)多相流、Schnerr&Sauer空化模型,建立了大涡模拟/Ffowcs Williams-Hawkings(LES/FW-H)耦合数值模型,并进行了流场仿真和水洞实验研究,获得了不同工况下水下运动体流噪特性。结果表明,水洞实验中,当空化数降低到0.8左右,才能明显看到空泡形成;水洞壁面湍流扰动所引起的噪声为水下运动体流噪的主要来源;运动体流噪与速度和压力有关,速度越大,噪声幅值越大;环境压力越大,噪声幅值也越大;运动体航行产生空泡后,其噪声特性发生改变,流噪变得更为复杂,起伏变化更快。Before cavitation occurs,the underwater moving bodies are mainly composed of structural noise,mechanical noise and instrument noise.These noises mainly radiate in multipole form with the line spectrum and the spectrum coexisting,and change with the flow velocity and the environmental pressure.Once the cavitation occurs,there are obvious differences in the noise spectrum.In order to study the noise characteristics of underwater moving body,a numerical model of large eddg simulaton/Ffowcs Williams-Hawkings(LES/FW-H)coupling is established based on the volume of fluid(VOF)multiphase flow and the Schnerr&Sauer cavitation model.The flow field simulation and water tunnel experiment are carried out,and the flow noise characteristics of underwater moving body under different conditions are obtained.The main results show that,in the water tunnel experiment,when the cavitation number drops to about 0.8,the cavitation can be seen obviously.Tunnel wall turbulence caused by noise is the main component of body movement.The flow noise of moving body is related to speed and pressure,with greater speed,the greater the amplitude of noise environment,and the greater the pressure,the greater the amplitude of noise.When motion vehicle cavitation occurs,the noise characteristics changes,and the flow noise becomes more complex and changes faster.

关 键 词：声学 水洞实验 空化 流噪 

分 类 号：O427.5[理学—声学]