沟渠内杨木三合板架空燃烧的火灾行为的研究  

Experimental Study on the Fire Behavior of Poplar Plywood Overhead Combustion Inside Trench

作　　者：陈长坤[1] 聂艳玲 张宇伦 雷鹏 焦伟冰 CHEN Chang-Kun;NIE Yan-Ling;ZHANG Yu-Lun;LEI Peng;JIAO Wei-Bing(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《工程热物理学报》2022年第2期559-567,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51576212);湖南省高新技术产业科技创新引领计划项目(No.2020SK2004)。

摘　　要：建立了缩尺寸沟渠火灾试验模型,测量了沟渠以及平台入口附近的温度分布,研究了沟渠内杨木三合板架空燃烧的位置和沟渠的倾斜角度对火蔓延行为的影响,分析了火焰传播特征和火蔓延速率。试验结果表明:在沟渠效应和烟囱效应的综合作用下,火焰先从杨木三合板与沟渠底板之间的狭长空间传播到沟渠顶部,在入口处形成喷射状火焰;狭长空间内的温度先快速上升,且在一定时间内明显更高,倾斜角度越大,高温段越贴近三合板表面,传热作用越明显;当倾斜角度为30°和45°时,火蔓延速率较大,三合板的架空高度较小时,从沟渠蔓延到平台入口的热烟气较多。A reduced-size trench fire model was established. The temperature distribution inside trench and near the entrance of the platform was measured. The influence of position of poplar plywood overhead combustion and inclination angle of trench on fire spread behavior inside trench was studied. The flame propagation behavior and flame spread rate were analyzed. The experimental results show that under the combined action of trench effect and stack effect, the flame first spreads from the long and narrow space between the poplar plywood and the bottom of the trench to the top of the trench, forming a jet flame at the entrance. The temperature in the long and narrow space rises rapidly first and is significantly higher in a certain period of time. The larger the inclination angle, the closer the temperature area to the surface of poplar plywood, the more obvious the heat transfer. When the inclination angle is 30°and 45°, the fire spread velocity is larger, overhead height of poplar plywood is smaller, more hot gas spread from the trench to the platform entrance.

关 键 词：沟渠火灾 燃料位置 倾斜角度 喷射状火焰 火蔓延速率 

分 类 号：TK956[动力工程及工程热物理]