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Moving model test of the smoke movement characteristics of an on-fire subway train running through a tunnel

机译：穿越隧道的有火地铁列车烟气运动特性的运动模型测试

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摘要

A moving model test was carried out to investigate the associated smoke movement characteristics when a subway train on fire runs in a tunnel. Train models of the 1/10 and 1/15 scales were used. The spatial distributions of airflow velocity and smoke concentration were then analyzed, and the differences between moving fire sources and stationary fire sources were discussed. The results show that the smoke movement characteristics of a stationary fire source were greatly different from those of a moving one. Specifically, the smoke movement for the moving fire source was dominated by piston wind. Moreover, the process of the smoke spread could be divided into three stages, during which time the flow direction changed. The peak smoke concentration value occurred after the train tail passed by the measuring point. Besides, the impacts of train speed (60 km/h, 80 km/h, 100 km/h, and 120 km/h) and blockage ratio (0.19 and 0.43) on airflow velocity and smoke concentration were also investigated. With increasing train velocity, the airflow velocity increased, and the smoke concentration decreased. The maximum airflow velocity was approximately linear with the train velocity. Furthermore, the increasing blockage ratio enhanced the piston effect in the tunnel, thus increasing the airflow velocity and reducing the smoke concentration.
机译：进行了运动模型测试，以研究地铁着火的地铁在隧道中行驶时的相关烟气运动特性。使用了1/10和1/15比例的火车模型。然后分析了气流速度和烟雾浓度的空间分布，并讨论了移动火源和固定火源之间的差异。结果表明，固定火源的烟气运动特性与移动火源的烟气运动特性有很大差异。具体而言，移动火源的烟气运动主要受活塞风的影响。此外，烟雾传播的过程可以分为三个阶段，在此期间，流向发生了变化。烟浓度峰值出现在列车尾部经过测量点之后。此外，还研究了火车速度（60 km / h，80 km / h，100 km / h和120 km / h）和阻塞率（0.19和0.43）对气流速度和烟雾浓度的影响。随着列车速度的增加，气流速度增加，烟气浓度降低。最大气流速度与火车速度大致成线性关系。此外，增加的堵塞率增强了通道中的活塞效应，从而提高了气流速度并降低了烟雾浓度。

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