为研究动车组通过西部高速铁路隧道车内压力舒适性问题,基于一维可压缩非定常不等熵流动模型的广义黎曼变量特征线法,数值模拟动车组通过坡度隧道车外压力;考虑动车组实际运行时压力保护阀及"车底排水孔"的开闭情况,采用当量泄漏面积法计算车内压力.以宝兰高速铁路隧道为背景,研究国内某复兴号动车组以250 km/h通过296、2 964、6 064、10 950 m 4个隧道时车内压力及舒适性.研究表明,动车组在坡度隧道内运行,车内压力受扰动波和隧道初始气压共同作用;车内压力满足国内和UIC压力舒适性标准舒适性标准,且有一定的冗余量,为研究西部高速铁路列车车内压力舒适性研究提供一定参考.
Research on the Comfort under Interior Pressure of High-Speed EMU Passing through High Altitude Railway Tunnels
This paper studies the comfort under interior pressure of high-speed trains passing through western high-speed railway tunnels.The generalized Riemann variable characteristic line method based on a one-dimensional compressible unsteady isentropic flow model is used to numerically simulate the external pressure of high-speed trains passing through the sloping tunnels with large gradient.Considering the opening and closing of the pressure protection valve and the"bottom drainage hole"during the actual operation of the high-speed train,the equivalent leakage area method is used to calculate the pressure inside the train.Considering the particularity of the Baoji-Lanzhou high-speed railway tunnels,this study examines the internal pressure and comfort level of a certain Fuxing high-speed train as it passes through tunnels of 296 m,2964 m,6064 m,and 10950 m long at a speed of 250 km/h.The research shows that the pressure inside the carriages is affected by both the disturbance wave and the initial air pressure in the tunnel.The interior pressure of the coaches meets the domestic and UIC pressure comfort standards,and there is a certain degree of margin.The result provides a reference for the study of comfort under inside pressure of the trains of western high speed railway.
high-speed traintunnelpressure wavepressure comfortone-dimensional flow model
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