| 高速列车车头曲面气动噪声的数值预测 |
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| 引用本文： | 肖友刚,康志成.高速列车车头曲面气动噪声的数值预测[J].中南大学学报(自然科学版),2008,39(6). |
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| 作者姓名： | 肖友刚 康志成 |
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| 作者单位： | 1. 中南大学,轨道交通安全教育部重点实验室,湖南,长沙,410075
2. 井冈山大学,工学院,江西,吉安,343009 |
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| 基金项目： | 湖南省自然科学基金资助项目
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中国博士后科学基金资助项目
，
山东省博士后科研项目专项经费资助项目
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| 摘 要： | 利用映射法生成高速列车头部流场的六面体贴体网格。采用三维大涡模拟法（LES）计算高速列车流线型头部的瞬态外流场，利用Lighthill-Curle声学比拟理论预测高速列车头部诱发的气动噪声。研究结果表明：气动噪声在很宽的频带内存在，是一种宽频噪声；在低频时，声压幅值较大，随着频率升高，幅值下降；当来流速度一定时，距离气动噪声源越远，总声压级越低，但总声压级的衰减幅度减少；随着列车运行速度增加，诱发的噪声加大，但距离车头曲面越远，总声压级的增幅越小；同一噪声源在不同受声点引起的噪声频谱曲线基本相似，控制列车运行过程中产生的脉动压力，能够减少气动噪声。
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| 关 键 词： | 高速列车 车头曲面 脉动压力 气动噪声 Lighthill-Curle声学理论 |
Numerical prediction of aerodynamic noise radiated from high speed train head surface |
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| XIAO You-gang,KANG Zhi-cheng.Numerical prediction of aerodynamic noise radiated from high speed train head surface[J].Journal of Central South University:Science and Technology,2008,39(6). |
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| Authors: | XIAO You-gang KANG Zhi-cheng |
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| Institution: | XIAO You-gang1,KANG Zhi-cheng2(1.Key Laboratory of Track Traffic Safety of Ministry of Education,Central South University,Changsha 410075,China,2.School of Technology,Jinggangshan University,Ji\'an 343009,China) |
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| Abstract: | Body-fitted hexahedron grid was obtained of high speed train head surface based on mapping approach.Large eddy simulation(LES)was applied to calculate the transient external flow field,and Lighthill-Curle acoustic theory was used to calculate the aerodynamic noises caused by streamlined train head.The results show that aerodynamic noises exist in very wide frequency band,and it is a kind of wide frequency noise.For low frequency components,sound pressure is greater.As frequency goes up,sound pressure reduce... |
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| Keywords: | high speed train train head surface fluctuation pressure aerodynamic noise Lighthill-Curle acoustic theory |
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