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.

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。

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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.

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。

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