着火列车制动进站过程烟气扩散特性模拟

为探究火灾列车制动驶向地下车站进行救援时的烟气扩散特性,采用理论分析和数值模拟的方法研究在不同控制烟气措施下,火灾列车减速至停止过程中烟气在车站轨行区及站台层的扩散规律,以及车站防灾通风系统受到的影响。结果表明:火灾列车制动进站时受移动火源与活塞风两大特性影响,烟气在上下游表现出明显的不均匀、不对称分布规律;屏蔽门虽能有效阻止烟气蔓延至站台层,但同时会增大轨行区活塞风速,增加烟气蔓延速度,不利于安全疏散;受活塞风影响,轨行区排烟效率下降了14%,轨行区各排烟阀火灾中下游排烟效率更高。

Simulationanalysis of smoke diffusion characteristics in the process of fire trainbraking

 In order to explore the smoke diffusioncharacteristics of fire train when braking to the underground station forrescue, theoretical analysis and numerical simulation were used to study thesmoke diffusion law in the rail area and platform layer of the station when thefire train slowed down to stop under different smoke control measures, and theinfluence of the fire prevention and ventilation system of the station underthis scenario was defined. The results show that the smoke distribution in theupper and lower reaches of the fire train is affected by the characteristics ofmoving fire source and piston wind. Although the shielding door can effectivelyprevent the smoke from spreading to the platform, it will increase the pistonwind speed in the rail area and increase the smoke spreading speed, which isnot conducive to the safe evacuation of passengers. The smoke discharge effectin rail area was limited by the influence of piston wind, and the total smokedischarge efficiency decreased by 14%,and the smoke exhaust valves in the lowerreaches of fire are more efficient.