Influence of Nose-slenderness Ratio on Air Pressure Pulse of High-speed Trains Passing Each Other

Lin Ma; Zihao Xie; Weiyu Chen; Zhenfeng Wu

doi:10.6180/jase.202204_25(2).0016

Influence of Nose-slenderness Ratio on Air Pressure Pulse of High-speed Trains Passing Each Other

Lin Ma This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Zihao Xie¹, Weiyu Chen¹, and ZhenfengWu¹

¹School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Received: March 24, 2021
Accepted: June 13, 2021
Publication Date: September 29, 2021

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202204_25(2).0016

ABSTRACT

The strength of side windows, the stability of train operation, and the comfort of passengers will be affected by air pressure fluctuations when the high-speed train meets. Based on the three-dimensional, compressible, and unsteady two-equation turbulence model, the moving grid technique and the finite volume method were applied to simulate the high-speed train meeting in the open air with nose-slenderness ratios of λ_L1=3.43, λ_L2=5.01, λ_L3=6.59 respectively, and the pressure curves of seven monitoring points near the side window of the train are obtained. The results show that when trains with different slenderness ratio meet at the same speed, the train with smaller nose-slenderness ratio will suffer greater aerodynamic impact. When the three trains with different slenderness ratio meet at the same speed with the same observing train, the train with a larger nose-slenderness ratio has smaller amplitude of the head pressure wave and the tail pressure wave, while the train with a smaller nose-slenderness ratio has larger amplitude of the two kinds of pressure wave. The reduction rate range of head pressure wave amplitude is 16.0-43.3% and that of the tail one is 13.5-32.1%. It can be seen that the air pressure pulse amplitude of trains crossing in the open air can be reduced by increasing the nose-slenderness ratio of the train.

Keywords: train crossing, numerical simulation, high-speed train, aerodynamic performance

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