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。 In view of the most unfavorable situation of a fire in the middle of a metro station with a screen door, the flue gas diffusion under natural and mechanical exhaust mode is simulated and the temperature field and concentration field of flue gas are given. Smoke exhaust system with a mechanical ability. The simulation of the closing mode of the exhaust system at the rail track at the end of the station was carried out and the model was found to be more conducive to the safe evacuation of personnel.