挑檐抑制PMMA竖直火蔓延数值模拟研究  

Numerical simulation on suppressing vertical fire spread of PMMA by cornice

作　　者：江文[1] 赵恒泽[1] 罗剑飞[1] 赵兰明[1] 王进军[1] 张永明[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230026

出　　处：《火灾科学》2016年第2期65-72,共8页Fire Safety Science

基　　金：国家重点基础研究发展计划(973计划)(2012CB719702)

摘　　要：应用FDS数值模拟软件,建立PMMA竖直火蔓延模型,通过改变防火挑檐长度和宽度,设计一系列工况,对比分析挑檐长度、宽度以及宽长比对竖直火蔓延的影响。结果表明当挑檐长度为临界值时,随宽度的增加,挑檐上方壁面温度与热释放速率均逐渐降低;挑檐宽度为临界值时,随长度的增加,挑檐上方壁面温度与热释放速率逐渐降低;挑檐长度较长时,有效阻火的挑檐宽度随长度的增加而逐渐减小,最后固定不变,最终建立了防火挑檐的临界点与热释放速率的无量纲模型。In this paper, the numerical simulation software FDS was used to establish the model of PMMA vertical fire spread. The influences of cornice length, width and the ratio of width to length on vertical fire spread were studied by designing a series of conditions with various fire cornice lengths and widths. The results were as follows. When the cornice length reaches a critical value, with the increase of the width, the wall temperature above the cornice and heat release rate decreases. When the cornice width reaches a critical value, with the increase of the length, the wall temperature above the cornice and heat release rate decreases. With a higher cornice length, the effective fire suppression width decreases gradually with the increasing of the length, and finally remains fixed. Finally a dimensionless model for the critical point of fire cornice with heat release rate is established.

关 键 词：防火挑檐 PMMA 竖直火蔓延 数值模拟 

分 类 号：X915.5[环境科学与工程—安全科学]