Numerical simulation for influence of line spacing on crossing pressure wave of high-speed trains in tunnel

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (21) : 79-88.

HU Xiao1, KONG Fanbing2, LIANG Yongting2, YU Miao2, DUAN Xiuping1, MEI Yuangui1

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Abstract

Based on 3-D, unsteady and compressible flow Reynolds-averaged N-S equations and SST k-ω turbulence model, adopting the overlapping grid technique, effects of 3 line spacings of 4.6 m, 4.8 m and 5.0 m on crossing pressure wave during 2 high-speed trains meeting in a tunnel at speeds of 250 km/h, 350 km/h and 400 km/h were studied.In view of the harm of intersection pressure wave, the effects were presented from three aspects including the maximum pressure value of car body, the pressure difference on both sides of car body and the phenomenon of “head-tail wave”.Results showed that the time history curve shape of the pressure difference on both sides of car body is similar to that of crossing pressure wave in open line; when the head and tail of the met train passing the measurement points, the pressure difference produces firstly positive and then negative pulses and firstly negative and then positive pulses, respectively, the pressure difference generated by the train tail passing is obviously lower than that by the train head passing; the amplitude of the head wave is about two times of that of the tail wave; the maximum positive pressure, the maximum negative pressure, the maximum pressure peak value, the amplitude of pressure difference on both sides of car body and the amplitude of “head and tail wave” have a negative exponential relationship with line spacing.

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high-speed train / tunnel / crossing pressure wave / line spacing / overlapping grid technique

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HU Xiao1, KONG Fanbing2, LIANG Yongting2, YU Miao2, DUAN Xiuping1, MEI Yuangui1. Numerical simulation for influence of line spacing on crossing pressure wave of high-speed trains in tunnel[J]. Journal of Vibration and Shock, 2020, 39(21): 79-88

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