Volume 23 Issue 2
Apr.  2023
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MEI Yuan-gui, WANG Zhi-jun, LYU Bo, DU Yun-chao, YANG Yong-gang. Full-scale experiment on pressure changes inside and outside high-speed trains in tunnels[J]. Journal of Traffic and Transportation Engineering, 2023, 23(2): 183-198. doi: 10.19818/j.cnki.1671-1637.2023.02.013
Citation: MEI Yuan-gui, WANG Zhi-jun, LYU Bo, DU Yun-chao, YANG Yong-gang. Full-scale experiment on pressure changes inside and outside high-speed trains in tunnels[J]. Journal of Traffic and Transportation Engineering, 2023, 23(2): 183-198. doi: 10.19818/j.cnki.1671-1637.2023.02.013
shu

Full-scale experiment on pressure changes inside and outside high-speed trains in tunnels

doi: 10.19818/j.cnki.1671-1637.2023.02.013

  • Gansu Province Engineering Laboratory of Rail Transit Mechanics Application, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China

Funds:

Science and Technology Research and Development Project of China State Railway Group Co., Ltd. N2022J055

More Information
  • Author Bio:

    MEI Yuan-gui(1964-), male, professor, PhD, meiyuangui@163.com

  • Received Date: 2022-12-21
    Available Online: 2023-05-09
  • Publish Date: 2023-04-25
    Abstract
  • Based on the full-scale experiment of 350 km·h-1 Chinese standard EMUs in the scientific test section of Datong-Xi'an High-Speed Railway, the variation characteristics of pressures inside and outside the train through the whole test section were studied by combining with the working state of the pressure protection valve. The impacts of tunnel length, line slope, tunnel group and train speed on the variations of pressures inside and outside the train were analyzed. The estimation method of the maximum pressure variation in the full-scale experiment in EN 14067-5—2010 and the clause "a pneumatic sealed chamber can be formed inside the whole train" in TB/T 3250—2010 were verified by the measured data. The variation characteristics of the whole train sealing efficiency and its relationship with the pressure comfort inside the train were studied. Analysis results show that the results obtained through the calculation method of the pressure peak outside the train in EN 14067-5—2010 are largely different from the measured data. The differences between the calculation results and measured data reduce significantly after the variable substitution correction of pressure variation caused by the friction between the train and the tunnel walls. When the pressure protection valve is closed, the large difference between the pressure outside and inside the train maintains for a long time after passing the tunnel with a steep slope. The closing of the interior end door, windshield through the platform door, and driver's cab door produces almost no airtightness effects, and the whole train throughout the space can be regarded as a pneumatic sealed chamber. The pressure variation caused by the head and tail ends entering tunnels and pressure variation induced by the air friction with the train and tunnel walls are proportional to the square of the train speed. The sealing efficiency of the whole train shows a decreasing trend with the increase of tunnel length, and the decrease will cause passengers' discomfort in ears. The research results can provide strong support for the in-depth understanding of the variation characteristics of pressures inside and outside the high-speed train when passing through tunnels and further improvement of relevant test standards in China and abroad.

     

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