在分析了地铁站台火灾时烟气流场变化规律的基础上，提出了临界通风速度的概念。
Based on the analysis of the variation law of smoke flow in subway platform fire, a concept about critical ventilation speed from platform to concourse was presented.
城市地铁火灾烟气运动规律的研究，对于地铁站台的设计以及地铁火灾的评估、扑救和预防都有重大的社会和经济意义。
Study of the smoke movements in city subway has a significant meaning for our society and environment, when we design subway platform and assess, rescue or defend subway fire.
研究与计算结果表明 ：该地铁站火灾时 ，站台至站厅的楼梯是整个疏散过程的瓶颈 ，而楼梯的疏散能力主要受人员流量和楼梯的 有效宽度所制约 ，据此提出了相应的解决方法。
The results showed that the width of the staircase from the platform to the station hall would be the bottleneck in the evacuation procedure and the solutions were presented for this case.
研究与计算结果表明 ：该地铁站火灾时 ，站台至站厅的楼梯是整个疏散过程的瓶颈 ，而楼梯的疏散能力主要受人员流量和楼梯的 有效宽度所制约 ，据此提出了相应的解决方法。
The results showed that the width of the staircase from the platform to the station hall would be the bottleneck in the evacuation procedure and the solutions were presented for this case.
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