地铁长大山岭隧道火灾烟气模拟分析
Simulation analysis of fire smoke in long mountain tunnels of underground railways
摘要：
通过建立大尺寸非稳态模型，采用Fluent软件对长大山岭隧道内列车火灾烟气的流动规律进行了模拟，分析了列车运行时产生的活塞风对着火列车烟气流动的影响规律，对不同的射流风机设置方案进行了对比。结果显示：在进行长大区间隧道通风排烟方案设计时，不仅要满足规范规定的2～11 m/s的排烟风速和临界风速要求，还要考虑抑制烟气回流的风速要求，才能更好地满足火灾时的人员疏散安全要求；可以加大射流风机数量，建议每线每端设置8组射流风机。
Abstract：
By establishing a large-scale unsteady model and using Fluent software, the smoke flow pattern of train fire in a long mountain tunnel is simulated. The influence of piston wind generated from the train running on the smoke flow of the burning train is analysed, and the different jet fan setting schemes are compared. The results show that in the ventilation and smoke exhaust scheme design of the long mountain tunnel, not only the smoke exhaust wind speed and critical wind speed from 2 to 11 m/s should be met, but also the wind speed requirement of restraining smoke reflux should be considered in order to better meet the safety requirements of personnel evacuation in case of fire. It is suggested that the number of jet fans can be increased, and 8 groups of jet fans should be installed at each end of each line.
Keywords:underground railway; mountain tunnel; fire; smoke exhaust; piston wind; smoke reflux; jet fan