地下组合受限空间火灾分区实验与数值分析

本论文对地下组合受限空间火灾初期的分区现象进行了模拟试验和数值分析。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。将数值模拟分析结果与实验结果进行了比较,二者吻合较好。研究表明,本文所采用的组合受限空间火灾三维模拟分析模型,是一种既能实现对实际结构复杂火灾现象的模拟分析又能在一定程度上满足实际工程要求的较好分析方法。

EXPERIMENTS AND NUMERICAL ANALYSIS OF ZONED PHENOMENON FOR FIRE IN UNDERGROUND COMBINATORY CONFINED SPACES

The experients and numerical simulation are carried for the zoned phenomenon of the fire in underground combinatory confined spaces. The special zoned phenomenon of the fire in underground 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". The results of numerical simulation is compared with the experimental results and it is consistent with the experimental results. The study indicates that the three-dimension model for fire in combinatory confined spaces applying in this paper is a preferable analytical method. It can be used to simulate the practical complex phenomena for fie and it could satisfy the require of practical engineering in some extent.