大空间火灾机械排烟的数值模拟分析

火灾烟气中含有多种有毒和有害成分，具有很大危害性，减少烟气危害的关键是将烟气层底面高度控制在对人员没有危害的高度。通过对大空间机械排烟的烟气流动过程进行CFD数值模拟，得出了大空间机械排烟的烟气流动性状，根据模拟结果可知，按现行设计规范，在火源释热率较大的情况下，难以将烟气层控制在理想的高度。文章建议根据火源释热率、火灾发生后的逃生时间、烟气层的控制高度合理确定大空间的机械排烟速率。

Numerical simulation and analyses of fire mechanical smoke extraction in large space

Fire smoke contains many toxic and harmful ingredients, so it has a great deal of harm. Controlling the height of the lowest layer of smoke under the harmful height is the key to reduce the harm. The paper simulates the flow of mechanical smoke extraction in large space by CFD, and gets the shape of the flow. According to simulation results and the current design standards, if fire heat release rate is very high, it is difficult to control smoke layer under ideal height. Therefore the article recommends that according to fire heat release rate, escape time and control height of smoke layer, the rate of mechanical smoke extraction should be reasonably decided.