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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。
Mobile smoke extractors are widely used in fire evacuation due to their own flexibility of use. Based on the visibility and the temperature, a large eddy simulation of the effect of using a smoke evacuator to exhaust smoke in a narrow-space fire was carried out. The results show that: without any smoke removal measures, the smoke spread speed, high temperature, prone to “walk fire” phenomenon, may cause unpredictable injuries; take positive pressure air supply or negative Exhaust exhaust exhaust mode to improve the visibility of space and reduce the space temperature has a significant role; positive pressure air supply and negative pressure exhaust joint use of a single exhaust mode as well.