Impact of Turbulent Flow underneath the Rear Snowplough on the Flow Field of Bogie Region and Aerodynamic Noise Characteristics of High-Speed Train

被引：0
|
作者：
Zhu J. [1 ,2 ,3 ]
Cheng G. [1 ,2 ]
Chen L. [2 ]
Gao Y. [4 ,5 ]
Zhang Q. [1 ,2 ]
机构：
[1] Institute of Rail Transit, Tongji University, Shanghai
[2] School of Automobile, Tongji University, Shanghai
[3] State Key Laboratory of Heavy Duty AC Drive Electric Locomotive Systems Integration, Zhuzhou
[4] School of Mechanical Engineering, Dalian Jiaotong University, Dalian
[5] National Engineering Research Center of Railway Vehicles, CRRC Changchun Railway Vehicles Co., Ltd., Changchun
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 06期
关键词：
Aerodynamic noise characteristics; Flow disturbing underneath snowplough; Flow field characteristics; High-speed train bogie; Noise control; Railway noise;
D O I：
10.3969/j.issn.1001-4632.2022.06.13
中图分类号：
学科分类号：
摘要：
Based on the characteristics of strong flow-induced noise produced from the leading bogie of high-speed train, the influence on the characteristics of flow field development and aerodynamic noise generation around the bogie through setting the parallel dents at the rear end of the regular snowplough bottom is calculated and analyzed. The proposed study is obtained through adopting a simplified model of high-speed train bogie and a nose car scale model using the delayed detached-eddy simulation model based on an acoustic analogy approach. An anechoic wind tunnel test is carried out thus verifying the noise reduction effect obtained from the numerical simulation. The results show that compared with the snowplough with smooth bottom surface, the parallel dents underneath the snowplough can mitigate the proliferation of the bogie's shear layer and the flow interaction between the snowplough wake and the components inside the bogie cavity by producing flow disturbing. Consequently, the forming and the shedding of the large-scale vortices around the bogie structure are restrained and the aerodynamic noise produced by the wall pressure fluctuations is reduced through weakening the flow separation. The area of sound source generated from the bogie region of a scaled nose car model in the anechoic wind tunnel is reduced with the sound amplitude dropping to around 1 dB(A). Thus, the aerodynamic noise is controlled effectively. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：119 / 130
页数：11
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