地铁站台区排烟模式优化选择探讨

Study on optimization of exhaust smoke mode in subway stations under different power sources

以某岛式地铁站为研究对象,采用FDS对不同火源功率下的地铁火灾进行模拟,分析地铁火灾中烟气蔓延规律及地铁站台与车站轨行区送排风模式的优化组合。通过建立地铁火灾模型和大涡模拟总结地铁火灾发生时,烟气蔓延、温度分布以及能见度的一般规律,对比站台区域采取排烟模式和送风模式的排烟效果。模拟结果显示,在火源功率为2 MW时,站台区域采取排烟模式与送风模式均可。当火源功率为4 MW时,站台区域采取送风模式会有更好的烟气控制效果。

An island subway station was chosen as the research object to study the spread of smoke in the subway fire, and the optimization of tunnel rail track area exhaust system and the platform ventilation system for emergency scenario were carried out by taking numerical simulation FDS under different fire power. The general law of flue gas spread, temperature distribution and visibility were summarized through the establishment of subway fire model and numerical simulation. The simulation results showed that when the fire power is 2 MW, both smoke exhaust pattern and air supply pattern of the platform ventilation system can be selected.When the fire power is 4 MW, setting the platform ventilation system as air supply pattern can provide better control performance.