Research on Distribution Characteristics of Air Tightness Threshold of CR450 High speed EMU Based on Tunnel Parameters of Chengdu-Chongqing Middle Line
Based on the tunnel characteristics of the Chengdu-Chongqing Middle Line,using the generalized Riemann variable characteristic line method of one-dimensional compressible isentropic flow model,the characteristics of pres-sure waves inside and outside the CR450 high-speed EMU when a single train passes and two trains meet,and the characteristics of the influence of tunnel length,speed,and different pressures in different time intervals on the air-tight threshold are studied.The results show that the amplitude of external pressure fluctuation in the most unfavor-able tunnel is the largest,and the amplitude of internal pressure fluctuation increases with the increase of tunnel length;When a single train meets the maximum pressure in every 3 s,the time constant threshold is basically the maximum in the most unfavorable tunnel.The most unfavorable tunnel length based on air tightness is different from the most unfavorable tunnel length based on the external pressure load at the intersection;The time constant thresh-old of a single train increases with the increase of speed.When two trains meet at 430 km/h and 450 km/h,the time constant threshold is basically the same;The maximum time constant threshold for a single train's head car and tail car to meet 13 pressure standards is 51 s and 42 s respectively,while for passing scenarios it is 88 s and 92 s respec-tively.
NETL
NSTL
万方数据
维普
