| 基于LES和FEM/AML方法对潜标结构流噪声预报研究 |
| Numerical Simulation for Flow Noise of Subsurface Buoy with LES and FEM/AML Method |
| 投稿时间：2018-08-17 修订日期：2018-10-18 |
| DOI： |
| 中文关键词: 潜标，流噪声，LES，FEM/AML |
| 英文关键词:Subsurface Buoy, Flow Noise, LES, FEM/AML |
| 基金项目:1.国家自然科学基金青年基金项目（61801275）； 2.山东省重大科技创新工程（SZD51802）； 3.水声技术重点实验室稳定支持课题（SSJSWDZC2018014）； 4.山东省重点研发计划（科技合作）项目（2018JHZ002） |
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| 中文摘要: |
| 为了更合理的预报潜标结构在海洋环境下的流噪声情况，本文采用基于大涡模拟（LES）结合远场自动匹配层（FEM/AML）技术的声学混合方法，以某NACA翼型结构为研究对象对其进行水下声学分析。该方法得到了频域条件下标体结构在特征点处的声压级频率响应曲线与表面声压分布情况，并与FLUENT计算结果进行对比，频率响应曲线变化趋势一致，证明了该方法预报水下结构流噪声的准确性。研究结果表明，标体结构流噪声能量主要集中在低频段，集中区域位于该标体的中后段，辐射噪声沿标体结构上下表面成瓣状分布，标体中部辐射范围大，标体头部、尾部辐射范围较小。 |
| 英文摘要: |
| In order to assess the flow noise of the submarine structure in the marine environment, a numerical simulation research using Large Eddy Simulation (LES) and Finite Element Method /Automatically Matched Layer (FEM/AML) method was made on a NACA airfoil model in this paper. The numerical simulation results which represent sound pressure level of characteristic point in frequency domain are in good agreement with the FLUENT data. The fluctuating pressure results and the surface sound of the subsurface buoy have a consistent distribution, which proves the accuracy of the method for predicting the flow noise of underwater structures. According to the research, the flow noise energy of low-medium frequency will concentrate on the rear part of subsurface buoy. The radiation noise of the target body in the sound field is distributed in a petal shape, and the radiation range is large in the middle of the target body, small in the tail part. |
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