三维孔腔流激噪声的大涡模拟与声学类比预报与验证研究  

Validation and prediction of flow induced noise of 3-dimensional cavity with large eddy simulation and acoustic analogy

作　　者：张楠[1] 沈泓萃[1] 朱锡清[1] 姚惠之[1] 谢华[1] 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2010年第1期181-190,共10页Journal of Ship Mechanics

摘　　要：孔腔流动从属于与自持振荡密切相关的一类基本流动。在工业领域中,孔腔流动会引起结构振动与疲劳、噪声的产生与阻力的急剧增加,因而备受关注。文章通过大涡模拟结合FW-H声学类比方法,对于五种不同尺寸的方形孔腔在水中的流动发声进行了数值预报。首先,简要介绍了国际上采用大涡模拟结合声学类比在孔腔流激噪声数值预报方面所做的一些研究;其次,详细描述了所使用的大涡模拟方法、动态Smagorinsky亚格子模型以及FW-H声学类比方法。最后,详细分析了计算结果,包括孔腔中的流谱、孔腔与载体上的涡量分布以及五个孔腔的辐射噪声频谱。将噪声的计算结果与试验结果进行了对比,验证了文中所建立的数值预报方法的可靠性。In industrial practice, the cavity-type oscillation is undesirable from the perspective of inducement of structure vibration and fatigue,generation of noise and drastic increase in drag on the body. In this paper,the flow induced noise in water of rectangular cavities of five sizes is predicted through large eddy simulation and FW-H acoustic analogy. Firstly, the international research works in predicting flow generated sound with LES and FW-H analogy are summarized. Secondly, the method of LES, the dynamic Smagorinsky subgrid model and the approach of FW-H analogy are described in details. Finally, the computed results including flow pattern in cavity,vorticity distribution and radiated sound spectrum are analyzed. The computed results are compared with experimental data, and the numerical prediction method is validated.

关 键 词：孔腔 流激噪声 大涡模拟 FW—H声类比 

分 类 号：TB561[交通运输工程—水声工程]