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首页> 外文期刊>Advanced Experimental Mechanics >Effect of Expansion Wave Generated by Train Tail Entering into Tunnel on Lateral Vibration of High-Speed Train
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Effect of Expansion Wave Generated by Train Tail Entering into Tunnel on Lateral Vibration of High-Speed Train

机译：机车尾部进入隧道产生的膨胀波对高速列车横向振动的影响

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It is well known that the lateral vibration of the trains running in tunnel becomes larger than that at open section, where we cannot find strong relevance to track irregularity in contrast to the vibration at open section. This vibration has been explained mainly by the aerodynamic flow separation and vortex shedding from the surface of trains. In this paper we focus on lateral vibration of the high-speed train (Shinkansen), and try to investigate not only flow separation but also expansion wave effect from the tail part of the trains on the vibration when they enter the tunnel. We have started to investigate with compressible and two-dimensional numerical analysis of aerodynamic flows around the trains. For the trains entering the tunnel, we performed the CFD with ghost cells and level set functions. As a result of interference of expansion waves and aerodynamic flow separation and alternating periodical expansion waves passing the train sides, large pressure difference on both sides of the trains moving forwards from the tail to the top is raised, which causes the lateral vibration.
机译：众所周知，在隧道中行驶的列车的横向振动变得比在开放部分的大，与在开放部分的振动相反，我们找不到与轨道不平整密切相关的地方。这种振动主要通过空气动力分离和列车表面的涡流脱落来解释。在本文中，我们着眼于高速列车（新干线）的横向振动，不仅试图研究流分离问题，而且试图研究列车尾部进入隧道时振动对它们的影响。我们已经开始研究火车周围空气流动的可压缩和二维数值分析。对于进入隧道的列车，我们使用幻像单元和水平设置功能执行了CFD。由于膨胀波和空气流动分离以及交替的周期性膨胀波通过列车侧面的干扰，列车从尾部到顶部向前移动的两侧的压力差增大，从而引起横向振动。

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