| 高速列车表面气动噪声偶极子声源分布数值分析 |
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| 引用本文： | 郑拯宇,李人宪.高速列车表面气动噪声偶极子声源分布数值分析[J].西南交通大学学报,2011,46(6):996-1002. |
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| 作者姓名： | 郑拯宇 李人宪 |
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| 作者单位： | 1. 西南交通大学机械工程学院,四川成都610031;重庆理工大学重庆汽车学院,重庆400054
2. 西南交通大学机械工程学院,四川成都,610031 |
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| 基金项目： | 高等学校博士学科点专项科研基金资助项目(20100184110002); 重庆市自然科学基金计划项目(CSTC,2008BB7341); 重庆市教委科学技术研究项目(KJ100811) |
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| 摘 要： | 以Lighthill方程为基础,采用边界元法并与计算流体动力学相结合,对高速列车表面气动噪声偶极子声源进行数值分析,以获得高速列车表面气动噪声偶极子声源分布.探讨了不同车速工况下列车车身表面气动偶极子声源的强弱及其分布特征,在此基础上对基于表面气动偶极子声源的列车外部气动声场进行了数值分析.研究表明:列车运行速度为270 km/h、频率为2.5 kHz时,声压级在90 dB以上的气动偶极子声源主要分布在车底转向架附近,其最大声源声压级约97 dB,是高速列车主要的气动噪声源区.
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| 关 键 词： | 车辆噪声 气动声学 非稳态流 大涡模拟(LES) 边界元法(BEM) |
Numerical Analysis of Aerodynamic Dipole Source on High-Speed Train Surface |
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| ZHENG Zhengyu
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LI Renxian.Numerical Analysis of Aerodynamic Dipole Source on High-Speed Train Surface[J].Journal of Southwest Jiaotong University,2011,46(6):996-1002. |
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| Authors: | ZHENG Zhengyu LI Renxian |
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| Institution: | ZHENG Zhengyu 1,2,LI Renxian 1(1.School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China,2.Chongqing Automobile College,Chongqing University of Technology,Chongqing 400054,China) |
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| Abstract: | Based on the Lighthill's acoustic equation,the boundary element method(BEM) combined with the computational fluid dynamics(CFD) was utilized to achieve the distribution of aerodynamic dipole source on high-speed train surface.The strength and distribution of the aerodynamic dipole source under different train speeds were investigated,and train's external aerodynamic acoustic field based on the aerodynamic dipole source was analyzed by a numerical simulation.The research results show that when a train runs a... |
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| Keywords: | vehicle noise aeroacoustics unsteady flow large eddy simulation(LES) boundary element method(BEM) |
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