Experimental study of water mist fire suppression in tunnels under longitudinal ventilation
Experimental study of water mist fire suppression in tunnels under longitudinal ventilation
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DOI：
10.1016/j.buildenv.2008.04.005
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发表时间：
2009-03
影响因子：
7.4
通讯作者：
Lvyi Chen;Wei Zhu;Xin Cai;L. Pan;G. Liao
中科院分区：
文献类型：
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作者：
Lvyi Chen;Wei Zhu;Xin Cai;L. Pan;G. Liao
通过小型实验研究了不同纵向通风速度下细水雾对隧道火灾的抑制作用。通过对比研究，在5种不同通风速度下，用两种喷雾喷嘴对垛火进行了灭火实验。结果表明，火焰的抑制过程可分为火焰整体抑制阶段、表面火焰熄灭阶段和内部火焰抑制阶段。研究了影响效率的几个因素。当细水雾喷头与火源间距增大时，灭火时间与通风速度的关系曲线呈“V”型。存在最佳通风速度。根据这些规律，细水雾与通风耦合系统可以显著提高灭火效率。
This paper studies water mist fire suppression under different longitudinal ventilation velocities in tunnels by small-scale experiments. After a scaling study, two mist nozzles are used for suppressing crib fires under 5 ventilation speeds. The result comes out that fire suppression process can be divided into three stages including flame unitary restraining stage, surface flame extinguishing stage and inside flame suppression stage. Several factors influencing efficiency are investigated. When the interval between mist nozzle and fire source enlarges, the relationship curve between fire suppression time and ventilation velocity shows a ‘V’ figure. The best ventilation speed exists. Following the rules summarized, a coupling system of water mist and ventilation may increase fire suppression efficiency remarkably.