表面开孔水下回转体流噪声数值模拟  

Flow-induced noise simulation of a underwater fenestratedl revolution body

作　　者：刘敏[1] 张宁[1] 周友明[1] 闫学琳[1] 陈小宁[1] 

机构地区：[1]武汉第二船舶设计研究所,湖北武汉430064

出　　处：《舰船科学技术》2011年第11期34-38,共5页Ship Science and Technology

摘　　要：采用大涡模拟湍流模型模拟表面开孔水下回转体在一定来流速度下非定常流体力学现象,分析了开孔附近的精细流动结构及时频特性。结合边界元方法(BEM)模拟流噪声的频域特征,分析了噪声空间分布及指向性特点。结果表明,表面开孔对流场的影响主要发生在前部几个开孔,舱内流体与主流在这几个开孔中发生质量交换,在舱内前部发生明显的掺混。前部开孔的压力脉动主要来自于开孔壁面的非定常涡脱落;中部及后部开孔对壁面压力脉动影响较小,主要脉动频率为回转体尾涡脱落频率。回转体总噪声级具有明显指向性,沿垂直开孔矢量方向较大,回转体上表面方向噪声级普遍大于下表面方向噪声级,且正上方及正下方噪声级较低,总噪声级沿不同指向相差不大。The flow field of a fenestratedl revolution body underwater is simulated using LES turbulent model.The turbulent microstructure and time-frequency character are analysed.The frequency-domain calculation of the flow-induced noise and analysis of the character of spatial distribution and directivity are processed using BEM method.The results show that mass-transfer takes place mainly at the forehead of the holes and mixing,infecting the main stream flow.The pressure fluctuation of the forehead holes are induced by vortex shedding at the frequency of the vortex shedding.The total SPL is bigger at the normal direction of holes and the total SPL at the upside direction is bigger than downside direction.There is minor variance at different directionality.

关 键 词：开孔 回转体 流噪声 计算流体力学 

分 类 号：U664.34[交通运输工程—船舶及航道工程]