不同通风方式对烟气蔓延的影响数值模拟
Numerical Simulation on Influence of Different Ventilation Modes on Smoke Spread
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摘要: 为了研究不同通风方式对巷道温度分布、CO浓度以及烟气蔓延的影响,基于Pyrosim火灾模拟软件,研究了Z型、U型、Y型通风方式对烟气蔓延的影响,以及Y型方式进风巷风速差对烟气逆流距离以及温度的影响。结果表明:不同类型通风方式的下游巷道温度大小依次为:U型> Z型> Y型;Z、U型通风方式在距离火源点55 m后CO浓度降低5.26 %/dm,而Y型通风CO浓度在距离巷道交叉点的20 m后逐渐趋于平稳;在Y型通风方式下,下游进风巷的风速对上游烟气逆流距离、温度等具有一定的影响,且风流速度越大,涡流消失时间越短。Abstract: To research the influence of different ventilation modes on the temperature distribution, CO concentration and smoke spread of the roadway, based on the fire simulation software Pyrosim, this paper studies the effects of Z, U, and Y ventilation modes on the smoke spread. Meanwhile, the influence of wind speed difference on flue gas counterflow distance and temperature in Y air inlet is studied. The research results show that the roadway temperature in the downstream area of different ventilation modes is in order U > Z > Y. For Z and U ventilation mode, the CO concentration reduces by 5.26% every 10 meters after 55 m away from the fire source point. The CO concentration of Y ventilation mode gradually stabilizes after 20 m from the intersection of the roadway. Under the Y ventilation mode, the wind speed of the downstream air inlet roadway has a certain effect on the upstream smoke backflow distance and temperature, the larger the wind speed is, the shorter the vortex extinction time is.
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Keywords:
- ventilation mode /
- mine fire /
- temperature /
- smoke spread /
- numerical simulation
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