大空间建筑正压送风排烟效果的模拟研究

Simulation Study on the Effect of Positive Pressure Ventilation in Large-Space Buildings

利用移动式排烟机正压送风可以很好地解决大空间建筑发生火灾时的排烟问题。本文利用FDS模拟研究了大空间建筑发生火灾时排烟口与送风口尺寸之间的关系对排烟效果的影响,结果表明:随着排烟口面积的增大,排烟效果越来越好,但排烟效能逐渐下降,综合考虑排烟效果及实际情况,认为排烟口面积为送风口面积的2倍时即可取得较为理想的排烟效果,研究结论可以为消防部队火场排烟提供一定的参考。

The problem of smoke extraction in large space buildings can be solved by using the positive pressure air supply from a mobile gas extraction machine. In this paper,the impact of the relationship between the sizes of smoke outlet and air inlet on the efficiency of smoke exhaust in a large-space building was researched by means of FDS simulation. The results show that with the increase of the area of smoke outlet,the effect of ventilation got better and better,but the efficiency of smoke exhaust was gradually decreased. Considering the effect of smoke control and the actual situation,if the area of smoke outlet is 2 times as large as the air inlet,an ideal smoke effect can be achieved. The research conclusions can provide some reference for fire brigades to discharge smoke in fire scenes.