基于变流通截面的高速铁路隧道单车压力波数值计算探讨

Numerical study of pressure waves produced by a high-speed train through a tunnel based on varying flow cross-sectional area

基于隧道内空气流通截面是时间和距离的二元函数条件与一维可压缩非定常不等熵流动理论,提出了高速铁路隧道单车压力波广义黎曼特征线法的计算方法和计算程序,并进行了不同喇叭状隧道端口条件下和不同列车前端鼻部长度的空气动力学效应分析计算。

Based on the crosssectional area of the fluid flow varying about time and distance , an onedimensional unsteady compressible nonisentropic flow prediction method for calculating the pressure transient generated by a high speed train passing through a tunnel is proposed in this paper. The characteristic method with generalized Riemann Variables is used for the numerical method. This prediction method is simplified than the conventional prediction mehod. It can be used to calculate the pressure waves produced by a train with various nose length through a tunnel with various hoods. The mechanism of pressure wave development was comprehensively understood in this paper according to the calculated results. 