边界层转捩区声辐射的预报方法研究  

Prediction method for noise radiated from boundary layer transition

作　　者：赵加鹏[1] 石秀华[1] 杜向党[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《应用声学》2009年第6期454-458,共5页Journal of Applied Acoustics

摘　　要：对Lighthill剪切应力脉动模型和Liepmann位移厚度脉动模型进行了讨论,在此基础上,本文提出利用Krane偶极子声源模型对Liepmann单极子声源模型进行改进。数值计算结果表明:作为偶极子声源的Lighthill理论剪切应力脉动模型,预报的噪声级偏低;而作为单极子声源的Liepmann模型,预报的噪声级又偏高;本文提出的两种改进模型预报的噪声级则与Lauchle实验值的一致性较好。For the boundary layer transition noise, the Lighthill model of fluctuating shear stress and the Liepmann model of fluctuating boundary （ayer displacement thickness are discussted. On this paper, the Liepmann model of fluctuating boundary layer displacement thickness is improved by using the Krane dipole sound source model. Numerical calculation result shows, the Lighthill model is belong to dipole sound source model and predicts too low noise levels, Liepmann model belongs to monopole sound source model and predicts too high noise levels, on the other hand, the noise levels calculated by our improvement models much agree with the Lauchle measured data.

关 键 词：边界层转捩区 噪声辐射 预报 单极子 偶极子 

分 类 号：O422.6[理学—声学] P457.6[理学—物理]