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Analysis of unsteady airflow in a subway station influenced by train movement

机译：火车运动影响的地铁站不稳定气流分析

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摘要

The piston effect has a significant effect on ventilation systems in subway stations. In this article, experimental data and computational fluid dynamics (CFD) methods are used to examine the behavior of the unsteady airflow generated by train movement. The experimental data recorded in an actual station in the Tehran subway and a full-scale model were used for the numerical simulation. The simulation was conducted using layering method to simulate the train movement through the tunnels and station according to the actual subway train velocity trend. Air curtains were used to reduce the undesired influence of the piston effect in the station and increase the efficiency of the ventilation system. The results indicated that maximum amplitude of air velocity at the subway entrance caused by the train movement can be reduced 67% by using an air curtain on the subway platform.
机译：活塞效应对地铁站的通气系统具有显着影响。 在本文中，实验数据和计算流体动力学（CFD）方法用于检查训练运动产生的不稳定气流的行为。 在德黑兰地铁的实际站中记录的实验数据和全规模模型用于数值模拟。 使用分层方法进行仿真，以根据实际地铁列车速度趋势模拟通过隧道和站的列车运动。 空气窗帘用于减少车站活塞效应的不期望的影响，提高通风系统的效率。 结果表明，通过在地铁平台上使用空气幕，可以减少67％的火车运动引起的地铁入口处的最大幅度。

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