列车隧道交会最不利长度数值模拟研究

Numerical Simulation on the Most Unfavorable Tunnel Length of High Speed Trains Passing by Each Other in Tunnel

通过计算流体力学方法,采用动态分层模型,对二维列车隧道交会问题进行数值模拟并结合图表探讨了最不利隧道长度问题.结果表明,相应于瞬变压力急剧程度,车头、车尾测点的最不利压力叠加分别发生在隧道列车长度比为3和4.5时.不同隧道长度下,测点压力最大值的变化不如测点压力最小值的变化明显,隧道交会过程中通常是负压起主导作用.

By means of computational fluid dynamics, two dimensional high speed trains passing by each other in tunnel was simulated using dynamic layering model, and the most unfavorable tunnel length problem was explored with the help of charts. Results show that corresponding to pressure fluctuation, the most unfavorable pressure superposition of train - head and train - tail measuring points happens when the ratio of tunnel length to train length is 3 and 4.5 respectively. In different tunnel lengths, the change of maximum pressure of measuring point is not as significant as the change of minimum pressure, which indicates that negative pressure usually plays a dominant role in the nrocess ~）f trA^n~ n~; 1-, .d.A~ ＂ 1