细水雾灭火机理探讨

Study on the Mechanism of Water Mist Fire Extinction

本文研究了细水雾水滴直径与蒸发时间的关系，不同可燃物燃烧耗氧量的关系，并分析了水滴蒸发吸热量和水蒸气分压增加对灭火效果的贡献，结合实验研究结果提出细水雾灭火的机理主要是水滴迅速汽化形成的水蒸气层阻碍了氧气向燃烧区域的扩散，而使可燃物燃烧耗尽局部区域氧气窒息熄灭。

The paper studies the relationship between fine droplet diameter and the evaporation time, and the amount of the oxygen exhausted by different combustible materials. The contribution of heat absorption amount of the droplet evaporation and the sub-pressurization of the vapor to the effect of fire extinction is also discussed. With theoretical and experimental study, authors find the main mechanism of the water mist fire extinction is that the water vapor layer formed by fine droplets rapidly evaporating prevents the diffusion of oxygen from outside to the closing zone of the flame, so that the combustion stops when the local oxygen content is exhausted.