Analyses the smoke characteristics in the development of fire and obtains its changing curves. According to different fire loads, studies the changing relation between the critical velocity and fire intensity.

• 摘要分析了地铁火灾烟气特性随火灾发展过程的变化情况，得到了烟气特性变化曲线。针对不同的火灾荷载，研究了临界风速随火灾强度的变化关系。