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由于占据了部分隧道空间,列车在运行时会产生活塞作用效应,列车周围的流场和压力场均发生变化,造成了隧道与外部空间的空气交换.为了找出列车相会时活塞效应的关键因素,根据粘性流体力学的非稳定流理论,分析了列车在隧道内的运行情况,采用相对坐标法建立了列车相会时的活塞风数学模型,提出了在自然风速影响下列车相会以及减速相会时的活塞风速计算方法.结果表明,列车活塞效应的影响因素主要有隧道净空尺寸、自然风速和阻塞比等.
Due to occupying part of the tunnel space, the train will produce piston effect during operation, the flow field and pressure field around the train will change, resulting in the exchange of air between the tunnel and the outside space.To find out the key to piston effect when the train meets According to the theory of viscous fluid mechanics and unsteady flow, the operation of the train in the tunnel is analyzed. The mathematical model of the piston air when the train meets each other is established by using the relative coordinate method. The result shows that the train meets and decelerates under the influence of natural wind speed The results show that the main influencing factors of train piston effect are the size of tunnel clearance, natural wind speed and blockage ratio.