【摘要】 应用DES(Detached Eddy Simulation)湍流模型模拟表面开孔水下回转体在一定来流速度下非定常流体力学现象,分析开孔附近的精细流动结构及流场时频特性;结合FW-H模型计算开孔体流噪声,分析噪声频谱及总噪声级指向性特点。对两种方案开孔形式的回转体流场及流噪声特性进行对比。结果表明:其中的一个方案较另一方案阻力增加1%,脉动幅值也较大;两方案指向性相似,方案1的噪声级在各方向上较方案2约大4dB。频谱分析结果表明,造成方案1噪声相对较大的主要原因是孔穴流动的相互干扰。更多还原

【Abstract】 Unsteady flow fields of two underwater fenestrated revolution bodies are simulated using DES turbulent model.The turbulent microstructures and time-frequency characters are analyzed.The frequency-domain calculation of flow-induced noise and analysis of the character of spatial distribution and directivity is processed using FW-H model for two cases of fenestration.The results show that the drag coefficient in case 1 is 1% bigger than that in case 2,the total SPL in case1 is 4dB bigger than that in case 2 at various directions and the directivity in these two cases are similar.更多还原