Study on the effect of mist flux on water mist fire extinguishing

被引：20

作者：

Liu, Yang ^{[1
]}

Fu, Zhixi ^{[1
]}

Zheng, Guanghui ^{[1
]}

Chen, Peng ^{[1
]}

机构：

[1] China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China

来源：

FIRE SAFETY JOURNAL | 2022年 / 130卷

关键词：

Spray pressure; Water mist; Fire extinguishing; Thrust ratio; Quantitative analysis; POOL FIRE; FLAME; OIL; PERFORMANCE; BEHAVIOR;

D O I：

10.1016/j.firesaf.2022.103601

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A series of combustion experiments were carried out by varying the pressure of water mist and the power of the fire source in order to quantitatively study the fire-extinguishing conditions of water mist. The main characteristics of an oil pool fire under the action of water mist are revealed through the analysis of experimental parameters, and a fire extinguishing model is established. The results showed that the thick flammable vapor layer on the oil surface is the source of water mist-induced flame expansion. Besides that, the splashing of oil droplets is one of the reasons for the flame's enhancement. After simplifying the combustion model, the heat and mass transfer approach was utilized to quantitatively study the water mist flux model for fire suppression. When the thrust ratio of fire versus spray (alpha) exceeds 5, the plume thrust has a significant impact on the water mist droplet trajectory, and the fire extinguishing fails. In other words, the water mist's cooling action is the primary mechanism for putting out the pool fire. The failure to extinguish the fire was mostly due to the mist flux being insufficient to absorb enough heat from the fuel surface to break the combustion equilibrium conditions.

引用

页数：10

共 35 条

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