地铁站火灾烟气扩散控制模式的数值模拟
Numerical simulation of smoke control modes in underground railway station fire
摘要：
提出了在楼梯口采用防烟空气幕来代替挡烟垂壁及速度不小于1.5 m/s向下气流的烟气控制模式。建立了双层地铁车站的物理模型，采用CFD方法模拟比较了4种烟气控制模式的控制效果。结果表明，在楼梯口设置防烟空气幕不仅可以保证人员6 min以上的安全疏散时间，而且减少了所需新风量，可以有效阻止火灾的进一步扩大和控制烟气扩散。
Abstract：
Puts forward a smoke control mode of applying smokepreventing air curtain substituting for ceiling screen and down air flow with velocity no lower than 1.5 m/s at the landing of stairs. Establishes a physical model of a twolayer underground railway station, simulates and compares four smoke control modes by CFD. The results indicate that more than 6 minutes for safe evacuation can be guaranteed by the smokeprevention air curtain and the quantity of fresh air is reduced compared with the conventional modes, therefore effectively prevents the fire expanding further and controls the smoke spreading.
Keywords:underground railway station, fire, smoke control, smokepreventing air curtain, ceiling screen