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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流动理论,提出了高速列车驶入设有缓冲结构隧道端口时产生初始压缩波的数值分析方法。一维流动理论采用考虑摩擦、传热以及空气质交换等因素的一维可压缩非定常不等熵流动模型。数值分析方法采用广义黎曼变量特征线法。与国外有关未设缓冲结构、开孔型与未开孔型缓冲结构的隧道端口三种情况的现车试验结果进行了比较,表明本文所建方法正确、合理,能够模拟计算多种类型缓冲结构条件下的压缩波波动规律。
Based on the binary function of time and distance and the one-dimensional flow theory, a numerical analysis method of generating initial compressional wave for high-speed train entering a tunnel port with a buffer structure is proposed. The one-dimensional flow theory uses a one-dimensional compressible unsteady isopentropic flow model considering factors such as friction, heat transfer and air exchange. The numerical analysis method adopts the generalized Riemann variable characteristic line method. Compared with the current vehicle test results of the existing three kinds of tunnel ports without buffer structure, open-hole type and non-open-type buffer structure, it shows that the method proposed in this paper is correct and reasonable and can simulate various types of buffer structures Under the conditions of the compression wave fluctuations.