As a key to tunnel smoke control, the critical velocity refers to a minimum vertical ventilation velocity which can effectively control the smoke under the direction of fire source without reversing.
临界风速是隧道烟气控制的关键所在，其指隧道火灾过程中能有效控制烟气于火源下风方向而不发生逆流的最小纵向通风风速。
As a key to tunnel smoke control, the critical velocity refers to a minimum vertical ventilation velocity which can effectively control the smoke under the direction of fire source without reversing.
临界风速是隧道烟气控制的关键所在，其指隧道火灾过程中能有效控制烟气于火源下风方向而不发生逆流的最小纵向通风风速。
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