EPS外保温系统竖向火蔓延特性  

Upward flame spread characteristics of EPS insulation system in specific scenarios

作　　者：郭峰[1,2] 朱国庆[1,2] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]中国矿业大学消防工程研究所,江苏徐州221116

出　　处：《消防科学与技术》2015年第7期853-856,共4页Fire Science and Technology

基　　金：江苏省自然科学基金资助项目(BK20131117);住房和城乡建设部科学技术项目(2011-K1-53);江苏省高校优势学科建设工程资助项目(PAPD)

摘　　要：建立EPS保温板贴壁竖向燃烧的二维数学模型,分析典型火灾场景（墙角火和墙面火）在火焰长度相关系数Kf和火焰加热区热流的差异,并根据相关实验数据和具体工程参数建立EPS外保温系统全尺寸火灾的场模拟模型,采用计算流体力学软件FDS对典型火源场景下的外保温系统火蔓延进行大涡模拟分析。结果表明：火焰前锋高度随时间变化呈指数函数增长。EPS板竖向火蔓延Kf取值在0.003~0.004 m2/kW,且墙角火场景下的取值是墙面火的1.3~1.4倍。墙角火的竖向火蔓延速度更快,火灾初期危险性更大;火灾中后期,墙面火场景存在辐射引燃侧墙导致多处火源并发的现象,有造成更大的扑救难度和火灾损失的风险。Two dimension mathematical model was established to study the characteristics of upward flame spread of EPS.The differences of flame length correlating coefficient Kfand heat flux from flame between two specific EPS board fire scenarios,window fire and corner fire,had been discussed.FDS was used to simulate the flame spread regularity of full-scale EPS external insulation system by large eddy simulation,based on the experimental data,engineering parameters,full scale fire spreading field model of EPS.Theoretical and simulation results showed that the time-varying upward flame spread fits exponential form.The Kfvalues is between 0.003 m2/kW and 0.004m2/kW,which in corner fire scenario is 1.3~1.4times to wall fire scenario.The fire risk is greater at the initial stage caused by the faster upward flame spread rate in corner fire scenario;at mid and latter stages of EPS fire in wall fire scenario,the phenomenon of multiple ignition sources may lead to greater difficulty of extinguishing and fire loss since the side wall is ignited by the radiation heat flux of main wall flames.

关 键 词：EPS保温系统 竖向火蔓延 大涡模拟 

分 类 号：X913.4[环境科学与工程—安全科学] TK123[动力工程及工程热物理—工程热物理]