Influence of Sichuan-Tibet Railway Tunnel Length on Pressure Wave of EMU Train Passing through Tunnels

doi:10.3901/JME.2022.16.309

Abstract

Abstract: To study the influence of the Sichuan-Tibet railway tunnel length on the pressure wave of the EMU train passing through tunnels, the one-dimensional compressible unsteady non-homentropic flow model and the method of characteristics of generalized Riemann variables are used to numerically calculate the external pressure wave of the train travelling in the uphill or downhill tunnel. The pressure wave characteristics of the head coach and the tail coach of the train passing through tunnels with different lengths are obtained. The influence law of the tunnel length on the peak values of the pressure wave of the train passing through tunnels is analyzed in detail. Results show that for the train travelling in the uphill tunnel, the maximum positive pressure of the head coach basically keeps unchanged when the tunnel length exceeds 1 km. The tunnel length has less effect on the maximum positive pressure of the tail coach. The maximum negative pressure amplitudes and the maximum peak-to-peak pressures of the head coach and the tail coach increase with the tunnel length, and the increase tends to be linear when the tunnel length exceeds 4 km. For the train travelling in the downhill tunnel, the maximum positive pressures and the maximum peak-to-peak pressures of the head coach and the tail coach basically increase with the tunnel length, and the increase tends to be linear when the tunnel length exceeds 4 km. The maximum negative pressure amplitudes of the head coach and the tail coach firstly increase and then decrease with the tunnel length. When the tunnel length exceeds 20 km, the maximum negative pressures of the head coach and the tail coach basically keep unchanged. The results can provide a reference for the design of the airtightness and the passenger pressure comfort of the Sichuan-Tibet railway EMU train.

Key words: tunnel length, EMU train, pressure wave, one-dimensional flow model, uphill and downhill

CLC Number:

U451

ZHANG Liang, TIAN Honglei, DU Jian, JIAO Jinghai, WANG Yanqing, MEI Yuangui. Influence of Sichuan-Tibet Railway Tunnel Length on Pressure Wave of EMU Train Passing through Tunnels[J]. Journal of Mechanical Engineering, 2022, 58(16): 309-318.

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