摘要
凸体作为水下航行器表面的一种常见附体结构,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非常重要的影响。在马赫数为0.004 8条件下,采用LES-Lighthill等效声源法对三维方形凸体的流场及声场进行仿真,形象地再现了凸体周围涡旋运动变化规律,分析了涡流流动机制及辐射噪声特征。通过正交试验设计,以噪声最小为目标,优化了三维方形凸体结构参数。研究成果为水下航行器附体结构的设计提供了依据。
The vortex noise generated by the convex body, which is common structures on the surface of autonomous underwater vehicle （AUV）, can not be ignored with the impact on the signal accuracy of the acoustic instruments mounted on AUV. The flow field and the turbulent flow noise generated by the flow past 3D convex body at Mach number 0.004 8 was simulated by LES-Lighthill equivalent sources method. The turbulence motion around the convex body and the characteristics of the radiated noise were described vividly. The structure parameters of the 3D convex body were optimized through the orthogonal test. The achievement provides a theoretical basis for controlling the turbulent flow noise and the appendage of the AUV.
出处
《海洋技术》
北大核心
2012年第3期29-32,共4页
Ocean Technology
基金
国家科技重大专项课题资助项目(2008ZX05027-004)
关键词
水下航行器
凸体
涡流噪声
正交试验
autonomous underwater vehicles
convex body
vortex noise
orthogonal test
