防烟空气幕防烟有效性模拟实验研究

利用火灾模拟软件FDS,以四川消防研究所高层实验塔二层为原型建立模型,对防烟空气幕的防烟有效性进行研究。本次实验在前室内设置测点,测定前室内的温度及CO浓度。实验结果表明:在未设置防烟空气幕时,前室内1.25m高度以上的测点温度稳定后均在35～45℃之间,CO浓度最大达到180ppm;在设置风幕后,前室内1.25m高度以上的测点温度稳定后在20～30℃之间,CO浓度最大为75.7ppm。因此,防烟空气幕能有效的减少烟气的进入量,降低进入前室的烟气的温度及有害气体浓度,为人员的安全疏散赢得时间。

Experimental Simulation of Effectiveness of Smoke-preventing Air Curtain

To understand the effectiveness of smoke-preventing air curtain,this paper used the professional software Fire Dynamics Simulation(FDS)to simulate the smoke movement process with the second floor of High Building Fire Test Tower in Sichuan Fire Research Institute of MPS as a prototype.The changing law of temperature and the smoke chemical component's concentration(CO)in different monitoring pots of the atria were observed during the simulation.The results show that the temperature is changing be- tween 35～45℃,and the ultimate concentration of CO reaches to 1.8×10~(-4) in the phase of stable burning above the height 1.25 m in the atria without smoke-preventing air curtains.And after installation of the smoke-preventing air curtains,the temperature is changing between 20～30℃,and the ultimate concentra- tion of CO reaches to 7.57×10~(-5) in the same monitoring pots.Therefore,it indicates that the smoke-pre- venting air curtain can effectively reduce the quantity of smoke,lower the temperature of smoke,and di- lute the concentration of toxic gases in smoke.