喷头安装角度对综合管廊细水雾灭火的影响

Influence of sprinkler installation angle on water mist extinguishing fire in utility tunnel

为研究综合管廊火灾中喷头安装角度对细水雾灭火效果的影响,搭建实体火灾实验平台,利用FDS模拟分析7种喷头安装角度下细水雾对烟气温度和烟气层高度的影响。结果表明:侧喷无线槽工况火场温度下降得更快,降温效果更好;喷头安装角度≤50°时,灭火时间少,灭火效果好,当喷头安装角度>50°时,灭火时间增加,灭火效果变差;喷头安装角度与平均温度降低值有一定的关系,但不呈线性关系,结合降温效果与烟气层高度,建议细水雾喷头安装角度为50°。

In order to study the effect of nozzle installation angle on the effect of water mist extinguishing fire in the utility tunnel,a physical fire test platform was built,and the effects of water mist on smoke temperature and smoke layer height under seven sprinkler installation angles were simulated by FDS.The results show that the temperature of the fire field in the side-jet wireless trough is lower and the cooling effect is better;when the nozzle installation angle≤50°,the fire extinguishing time is less and the fire extinguishing effect is better.When the sprinkler installation angle>50°,the fire extinguishing time increases,and the fire extinguishing effect becomes worse;The installation angle of the sprinkler has a certain relationship with the average temperature drop,but it does not show a linear relationship.Considering the cooling effect and the height of flue gas layer,it is suggested that the installation angle of water mist nozzle should be 50°.