开孔缓冲结构条件下的隧道单车压力波特征数值分析

在假定隧道内空气流通截面是时间和流动距离的二元函数条件下,根据一维可压缩非定常不等熵流动理论与广义黎曼变量特征线法,发展了高速列车通过设置开孔缓冲结构隧道的单车压力波计算方法,并进行开孔缓冲结构不同参数对初始压缩波强度和压力梯度的分析计算,揭示了开孔缓冲结构的空气动力学特征,对探讨减缓洞口微压波提供了一种分析方法。

Numerical Study on Pressure Waves Produced by a High-speed Train through a Tunnel with Perforated Hoods

The one-dimensional unsteady compressible non-isentropic flow prediction method for pressure waves produced by a high-speed train through a tunnel with perforated hoods is proposed . The equations of one-dimensional flow in which the area of the tube is dependent on the time and the distance were numerically solved by the method of characteristics expressed with generalized Riemann Variables. The calculations were performed for tunnels with various hoods of which porosities are different. The effects of the porosity of the hood for the shape and pressure gradient of compression waves were quantitatively clarified. The results show that the pressure gradient with time of compression waves is affected largely by the porosity of the hood. This method is used to investigate entry pressure waves of tunnels with the perforated hoods for analyzing micro-pressure waves .