Influence of hood length on pressure wave characteristics induced by 600 km/h maglev train passing through tunnel

被引：0
|
作者：
Zhang J. [1 ,2 ,3 ]
Wang Y. [1 ,2 ,3 ]
Han S. [1 ,2 ,3 ]
Wang F. [1 ,2 ,3 ]
Gao G. [1 ,2 ,3 ]
Xiong X. [1 ,2 ,3 ]
机构：
[1] Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha
[2] Joint International Research Laboratory of Key Technology for Rail Traffic Safety, School of Traffic & Transportation Engineering, Central South University, Changsha
[3] National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, School of Traffic & Transportation Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 05期
关键词：
Hood; Initial compression wave; Maglev train; Micro-pressure wave; Numerical simulation;
D O I：
10.11817/j.issn.1672-7207.2022.05.012
中图分类号：
学科分类号：
摘要：
When a maglev train enters the tunnel at high-speed, the air flow is compressed due to the restriction of the tunnel wall, forming an initial compression wave. When the wave propagates in the tunnel, it will cause strong pressure fluctuations, and produce noise sonic boom at the exit of the tunnel, which will seriously threaten the auxiliary facilities inside the tunnel and the surrounding environment at the tunnel portal. Particularly, when the speed of the maglev train reaches 600 km/h and more, this aerodynamic effect becomes more significant. Therefore, it is necessary to deeply study the sudden change of pressure caused by high-speed maglev trains and the corresponding mitigation measures. Based on three-dimensional unsteady, compressible N-S equations and combined with the k-εturbulence model, the pressure change curves and pressure gradient at monitoring points on different cross-sections were analyzed, when the maglev train passed through a 2 km long tunnel. The length effects of the enlarged cross-section hood on the initial compression waves at the entrance and the micro-pressure waves at the exit were studied. The results show that during the propagation of the compression wave in the tunnel, the speed of the later compression wave is greater than that of the former one, resulting in an intensification phenomenon on the initial compression wave. After installing the hood, the gradient of the initial compression wave at the entrance of the tunnel and the micro-pressure wave at the exit are relieved. As the length of the hood increases up to 100 m, the amplitudes of the initial compression gradient and the micro-pressure wave reach the minimum values. Compared with the tunnel without hood, the amplitude of the micro-pressure wave at 20 m from the tunnel exit with hood is reduced by 60.0%, while that at the 50 m from the tunnel exit is decreased by 58.9%. With the further increase of the hood length, the amplitudes of the initial compression wave gradient and the micro-pressure wave remain basically unchanged. © 2022, Central South University Press. All right reserved.
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页码：1668 / 1678
页数：10
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