水下航行体艏部低噪声线型的声学设计方法

本文按照Lauchle提出的过渡区湍流猝发的单极子声辐射理论，在确定航行体线型和计算势流分布的基础上，通过计算边界层厚度和转捩点位置、确定湍流斑猝发的统计特性，再由适当近似计算过渡区的声辐射，从而建立水下航行体艏部低噪声线型的声学设计方法。数值计算表明优化的艏部线型与国外资料中的艏部优化线型十分接近，艏部声纳部位自噪声的计算结果与模型试验结果相比，在3kHz以上频段偏差小于3dB。

An acoustic designing method of low noise profile for fore-body of underwater vehicle

For designing the profile of underwater vehicle and defining its distribution of potential flow , the displacement thickness and location of transition point of boundary layer was calculated, and the statistical properties of turbulent burst in the transition zone was determined. And then the acoustic radiation of transition was calculated with proper approximation , according to the theory of mono-pole acoustic radiation from turbulent burst in the boundary layer transition proposed by Lauchle. So a method of acoustic design of low noise profile for fore-body of underwater vehicle was put forward. The results of numerical calculation show that the optimum low noise profile of fore-body is very close to that given in references, and the comparison of the numerical prediction with the model test data for sonar self noise in fore-body shows that their difference is less than 4dB in the frequency range above 3kHz.