防烟空气幕在隧道火灾中的试验研究

Experimental study on smoke preventing air curtain in tunnel

为研究防烟空气幕在隧道火灾中的挡烟效果,在应急管理部四川消防研究所隧道试验基地开展了一系列1 MW和2 MW的全尺寸火灾试验,分析了隧道内温度以及氧气的分布情况。试验结果表明:防烟空气幕能有效控制烟气蔓延;火源功率越大,火源附近氧气体积分数越小;空气幕出流风速越大,隧道内氧气体积分数越大,聚积在火源上方顶棚处烟气量越少,顶棚处温度越低。

Through a series of full-size fire experiments of 1 MW and 2 MW carried out at the tunnel experimental base of Sichuan Fire Research Institute of MEM. The distribution of temperature and oxygen in the tunnel is analyzed respectively, to study the smoke blocking effect of air curtain in tunnel fire. The results show that the air curtain can effectively control the smoke spreading;the bigger the fire power, the smaller the oxygen volume fraction near the fire source;the bigger the wind speed of the air curtain, the bigger the oxygen volume fraction in the tunnel, the less the smoke gathering on the ceiling above the fire, and the lower the temperature on the ceiling.