不同雷诺数下圆柱流噪声分析

Analysis of Underwater Radiation Noise of Cylinder at Different Reynolds Numbers

准确预测和分析水动力噪声,对于提升潜艇、鱼雷、水面舰船等航行体的隐身性能有着极大的意义。论文基于开源CFD计算平台OpenFOAM,采用混合计算方法中的声类比法对水下圆柱体的流噪声进行预报。为精细化捕捉声源处流动特性,采用大涡模拟(LES)方法对湍流流动进行模拟。近场噪声通过脉动压力的变换来表达,远场的辐射噪声则通过Curle积分解来获取。在三个典型雷诺数下求解圆柱辐射噪声,对比了近、远场指定测试点处的声压频谱特性,分析了雷诺数对辐射噪声的影响,为后续复杂几何潜体的水动力噪声预报提供依据。

Accurate prediction and analysis of hydrodynamic noise are of great significance for improving stealth performance of submarines, torpedoes, and surface ships. Based on the open source CFD computation platform OpenFOAM, flow noise of an underwater cylinder is predicted and analyzed with the acoustic analog method for the hybrid calculation. In order to capture flow characteristics finely at the sound source, the large eddy simulation(LES) method is used to simulate the turbulent flow. The near-field noise is expressed through a transformation of the pulsating pressure, and radiated noise in the far-field is obtained by the Curle integral solution. This paper focuses on solving cylindrical radiation noise at three typical Reynolds numbers. Sound pressure spectrum characteristics at designated test points in the near-field are compared with that of the far-field, and the influence of Reynolds number on the radiation noise is analyzed to provide a theoretical basis for the submerged body with complex geometry.