地下复杂组合受限空间火灾分区现象与初期模式实验研究

Experimental Study of Zoned Phenomenon and Initial Patterns for Fire In Underground Complicated Combinatory Confined Spaces

主要介绍地下狭长与组合受限空间油料介质火灾分区现象、初期火灾主要模式模拟实验研究结果与讨论;地下组合受限空间火灾呈现出特殊的分区现象。一般可分为燃烧区、新鲜空气补充区、烟气流区、过渡区和火焰后面的"惰化区"五区。有上下两层的地下复杂组合受限空间可分为燃烧区、烟气流区、新鲜空气补充区和"惰化区"4区。地下受限空间(包括组合受限空间、容积式受限空间和狭长受限空间)密闭条件下火灾初期模式主要有:爆炸、爆炸减弱、爆炸增强、燃烧、爆燃向爆轰发展。地下复杂组合受限空间下部与下部狭长受限空间分别全开口条件下着火后火灾主要模式为爆炸、燃烧、爆炸后持续燃烧、爆炸后短时燃烧、爆炸后发展为出口外爆炸;爆炸又可分为爆炸强度逐步加强、爆炸由爆燃发展为爆轰、爆炸强度逐步减弱。

The experimental results of the zoned phenomenon and the initial patterns for the fire in the long narrow and combinatory confined spaces are introduced in this paper. The special zoned phenomenon of the fire in the long narrow and combinatory confined spaces was observed in the experiments. The fire zones are generally divided into five zones: flame zone, high temperature thermal plumes zone, fresh air supplement zone, transitional zone and 'inert zone'. The fire zones in the combinatory confined spaces with the upside and lower long narrow confined ones are divided into four zones: flame zone, high temperature thermal plumes zone, fresh air supplement zone and 'inert zone'. With the ports completely closed, the fire patterns during initial stages in the confined spaces (include the combinatory confined space, the volumetrical confined space and the long narrow confined space) are explosion, explosion from strong to weak, explosion from weak to strong, combustion and development from deflagration to detonation. With the ports in the upside and lower long narrow confined spaces opened, the fire patterns during initial stages in the combinatory confined spaces are explosion, combustion, continuous combustion after explosion, short combustion after explosion and explosion outside the deport after the initial inner explosion. The explosion can be divided into explosion from weak to strong, explosion from strong to weak and development from deflagration to detonation.