水下高速航行器流噪声数值仿真与分析

摘要

运用计算流体力学方法仿真计算不同头型、不同航速航行器流噪声，得到流噪声分布及随航速变化规律。通过对比分析数值仿真结果发现，航行器流噪声随航速的增加而平稳增大。在相同条件下，平头航行器流噪声总声压级略高于圆头航行器。为了更好预测高航速条件下航行器流噪声，对空化区流噪声进行了初步探索。%The flow noise of underwater vehicle as the main self-noise source, which disturbs the normal working of sonar is especially serious during natural cavitation.Computational fluid dynamics ( CFD) is used to calculate flow noise of vehicle with different head shapes and velocities.The distribution and rule of flow noise are obtained for va-rious velocities.It is found that the flow noise of vehicle increases steadily with increasing velocity through the com-parison and analysis of numerical simulation results.Under the same conditions, the flow noise of flat-head vehicle is a little larger than round-head.For the sake of predicting the flow noise of high-speed vehicle, the flow noise across cavitation regions is researched preliminarily in this paper.