文章摘要
龙双丽,聂宏,许鑫.不同雷诺数下圆柱绕流气动噪声数值模拟[J].声学技术,2011,(2):111~116
不同雷诺数下圆柱绕流气动噪声数值模拟
Numerical simulation of noise induced by flow around a cylinder at different Reynolds number
投稿时间:2010-04-21  修订日期:2010-07-17
DOI:
中文关键词: 大涡模拟  声类比  气动声学
英文关键词: large eddy simulation  acoustic analogy  aeroacoustics
基金项目:航空科学基金项目(2009ZA52001);江苏省高科技支撑计划-工业部分资助项目(BE2008137);江苏省普通高校研究生科研创新计划资助项目(CX10B_105Z,CX10B_088Z)
作者单位E-mail
龙双丽 南京航空航天大学飞行器先进设计技术国防重点学科实验室, 南京, 210016 longshuangli@nuaa.edu.cn 
聂宏 南京航空航天大学飞行器先进设计技术国防重点学科实验室, 南京, 210016  
许鑫 南京航空航天大学飞行器结构力学与控制教育部重点实验室, 南京, 210016  
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中文摘要:
      基于大涡模拟和声类比相结合的混合方法对不同雷诺数下二维圆柱绕流的远场气动噪声进行预测。预测值与试验数据吻合良好。根据预测结果分析圆柱绕流气动噪声的声场特性,研究流场振荡规律对远场噪声的影响和圆柱绕流气动噪声的辐射特性,并寻找降低圆柱绕流气动噪声的途径。结果表明:随着雷诺数的增加,远场各测量点的总声压级增大;声场的最大声压级与流场的振荡规律相关;圆柱绕流气动噪声的辐射指向性与偶极子声源的辐射指向性最相似;减小雷诺数或者圆柱表面涡脱落引起的非定常脉动力能够降低圆柱绕流气动噪声。
英文摘要:
      The hybrid method based on large eddy simulation and acoustic analogy is used to predict two-dimensional far field noise induced by flow around a cylinder at different Reynolds number.The simulation results are in agreement with experimental data.Based on the prediction results,the characteristic of the acoustic field,the effect of flow oscillation on noise levels and the noise radiation are studied;the noise reduction methods are searched.The results validate that the overall sound pressure level of the receiver increases with the increase of Reynolds number;the oscillation law of the flow has influence on the sound pressure level;the noise radiation directivity is similar to the radiation directivity of a dipole source;reducing Reynolds number or unsteady force induced by detached eddy can reduce the noise induced by flow around a cylinder.
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