排烟对狭长空间火灾烟气特性影响的模拟

摘要

移动排烟机由于其自身使用的灵活性，被广泛用于火场排烟。以能见度及温度为指标，对狭长空间火灾发生时使用移动排烟机进行排烟的效果进行了大涡模拟。分析结果表明：在不采用任何排烟措施的情况下，烟气蔓延速度快、温度高，容易出现“游走火”现象，可能造成难以预估的伤害；采取正压送风或负压排风的排烟方式对提高空间能见度及降低空间温度有显著作用；正压送风与负压排风联合使用效果不如单独使用一种排烟方式。%As its own flexibility,portable smoke exhausted fan is widely used in exhausting smoking in fire.Visibility and temperature were taken as the index to simulate the effect of portable smoke exhaust fan in long corridor fire.The analysis results show that in the case of not using any smoke control measures, the long corridor smoke spreads fast and the temperature is high,where is prone to appear “ghosting phe-nomenon”,which may cause unpredictable damage.And the positive pressure blowing or negative pres-sure drainage is helpful to improve the visibility of the space and to reduce the space temperature.The joint effect of positive pressure blowing and negative pressure drainage is not as good as using single method.