Comparative Study of the Suppression Behavior and Fire-Extinguishing Mechanism of Compressed-Gas Aqueous Film-Forming Foam in Diesel Pool Fires

IF 3 3区农林科学 Q2 ECOLOGY Fire-Switzerland Pub Date : 2023-07-06 DOI:10.3390/fire6070269

Long Yan, Ning Wang, Jingjing Guan, Zheng Wei, Qiaowei Xiao, Zhisheng Xu

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Abstract

A compressed-gas fire extinguishing experiment was carried out to analyze the impact of gas-liquid flow ratio, liquid flow rate and driving pressure on the fire suppression efficiency of aqueous film-forming foam (AFFF) in a diesel pool fire, and a possible fire-extinguishing mechanism was proposed. A fire suppression test showed that AFFF at a gas-liquid flow ratio of 16 between the range of 5 to 24 had the fastest fire-extinguishing temperature drop rate (16.67 °C/s), the shortest fire-extinguishing time, of 42 s, and the lowest foam solution consumption of 230 g, exhibiting the best fire suppression performance. Meanwhile, the fire suppression efficiency of AFFF improved with the augmentation of either liquid flow rate or system driving pressure. Based on fluid mechanics and combustion science, a foam fire-extinguishing mechanism was proposed to explain the influence of system parameters such as gas-liquid ratio, liquid flow rate and driving pressure on key combustion parameters such as temperature drop rate, evaporation rate and combustion rate, which can better illustrate the change in fire extinguishing performance.

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压缩气体水成膜泡沫对柴油池火灾的抑制性能及灭火机理比较研究

通过压缩气体灭火实验，分析了柴油池火灾中气液流量比、液体流速和驱动压力对水性成膜泡沫灭火效率的影响，并提出了可能的灭火机理。灭火试验表明，在5至24的气液流量比为16的情况下，AFFF的灭火温度下降速度最快（16.67°C/s），灭火时间最短（42s），泡沫溶液消耗量最低（230g），表现出最佳的灭火性能。同时，随着液体流速或系统驱动压力的增加，AFFF的灭火效率也有所提高。基于流体力学和燃烧科学，提出了泡沫灭火机理，解释了气液比、液体流速和驱动压力等系统参数对降温率、蒸发率和燃烧率等关键燃烧参数的影响，可以更好地说明灭火性能的变化。

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