地铁车站火灾烟控模式的数值模拟

Numerical simulation on smoke control schemes of underground railway stations

针对设有屏蔽门的地铁车站中部发生火灾的最不利情形,模拟了自然排烟和机械排烟模式下的烟气扩散情况,给出了烟气的温度场和浓度场,考察了该车站现有机械排烟系统的排烟能力。对车站轨底排烟系统关闭模式进行了模拟,认为该模式更有利于人员安全疏散。

Simulates the smoke propagation under natural and mechanical smoke extraction modes in the worst situation of fire happening in the middle part of the underground railway with shield door. Presents the distribution of temperature and concentration, and studies the exhausting ability of the existed mechanical smoke control system. Simulates the scheme of smoke extraction system with rail bottom smoke extraction system closed, and finds that the system is more helpful to evacuation.