摘要
孔腔及凸体作为水下航行器表面的常见结构,其产生的涡流噪声对搭载在水下航行器上的声学仪器的信号精度有不容忽视的影响.根据水下航行器上搭载的声通讯调制解调器安装结构抽象出几何模型,即孔腔、凸体组合结构,采用LES-Lighthill等效声源法对该孔腔、凸体组合结构的流场及声场进行仿真,通过分析不同模型的流动机制及涡流噪声特性,指出了凸体高度对涡流噪声的影响.研究表明,凸体高度与孔腔深度相等时,产生的涡流噪声最小.研究成果为水下航行器声通讯安装结构的设计提供了依据.
The vortex noise generated by cavity and convex body, which are common structures on the surface of autonomous underwater vehicle （AUV）, with its impact on the signal accuracy of the acoustic instruments mounted on AUV, can not be ignored. A geometric model, i.e. the composite structure of cavity and convex body, was ex- tracted according to the structure of the acoustic communication modem mounted on the AUV. The flow field and vor- tex noise generated by the flow past composite structure of cavity and convex body were simulated by large eddy simulation （LES） -Lighthill equivalent source method. The flow mechanism and characteristics of vortex noise of dif- ferent composite structures of cavity and convex body were investigated. Results show that in at1 investigated models, the vortex noise is the weakest in the composite structure with the cavity depth equaling to the height of con- vex body. The research provides guidance for designing the structure of acoustic communication modem mounted on the AUV.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2012年第10期881-887,共7页
Journal of Tianjin University(Science and Technology)
基金
国家科技重大专项子课题资助项目(2008ZX05027-004-03)
国家自然科学青年基金资助项目(51105268)
关键词
水下航行器
凸体
孔腔
涡流噪声
autonomous underwater vehicle
convex body
cavity
vortex noise
