An Integrated Prediction Method of Torpedo Flow Noise
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摘要: 基于边界层理论和转捩区声辐射理论，在对传统鱼雷流噪声预报模型进行分析和对比的基础上，提出了一种鱼雷流噪声的综合预报方法。该方法利用Krane的偶极子声源模型对基于Liepmann理论的位移厚度脉动单极子声源模型进行改进，并综合考虑压力梯度和声衍射损失对转捩区声辐射的影响。结果表明，与零压力梯度相比，逆压梯度下的转捩区将导致更高的噪声辐射，利用综合预报方法预报的噪声级与实测值的一致性较好。Abstract: Based on boundary layer theory and radiated noise theory of boundary layer transition, the conventional torpedo flow noise prediction models are analyzed and compared, and an integrated prediction method of torpedo flow noise is hence presented. This new method improves the Liepmann analogy based on displacement thickness monopole sound source model by using Krane dipole sound source model, and considers the effects of pressure gradient and the loss of noise diffraction on boundary layer transition.Calculation results show that the transition in an adverse pressure gradient results in higher radiated noise in comparison with the transition in a zero pressure gradient, and the noise prediction by the integrated prediction method coincides with the measured one.
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[1] 李福新,张宇文,石秀华.回转体流噪声-边界层转捩区的声辐射.声学学报,1999,24(5):536-543. [2] Lauchle G C.Transition Noise-The Role of Fluctuating Displacement Thickness.Journal of Acoust Society,1981,69(3):665-671. [3] Lauchle G C.On the Radiated Noise due to Boundary-layer Transition.Journal of Acoust Society,1980,67(1):158-168. [4] 史里希廷.边界层理论.徐燕侯,译.北京:科学出版社,1988. [5] Lauchle G C.Noise Generated by Axisymmetric Turbulent Boundary-layer Flow.Journal of Acoust Society,1977,61(3):694-703. -
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