摘要
为探究凹型结构建筑外立面挤塑聚苯乙烯(XPS)外墙保温材料的火灾蔓延特性,运用FDS火灾动态仿真模拟软件,采用大涡模拟(LES)方法建立凹型结构外立面火灾蔓延模型,总结不同防火隔离带高度和不同方向外界风情况下火焰前锋和温度变化特征,并与无风和无防火隔离带情况进行对比分析。结果表明:火焰前锋高度随时间变化呈指数关系;防火隔离带、正面风和45°向下方向的外界风均可对火灾蔓延初期起到一定的阻隔和抑制效果;为保证隔火效果,防火隔离带之间的距离不应大于3 m;而45°向上方向的风对火灾蔓延起到助推作用。
In order to explore fire propagation characteristics of XPS insulation materials on facade of concave structure buildings,a fire spreading model was established by utilizing simulation software FDS and large eddy simulation(LES)method.Then,variance of flame front and temperature for different firebarrier belt width and directions of outside wind were summarized,and they were compared with conditions of no wind and no fire belt.The results show that flame front height varies with time in an exponential way.Fire belt,positive wind and outside wind in downward direction of 45 degrees can block and restrain fire at the beginning of its spread.In order to ensure fireproof effect,distance between fire belts should not be greater than 3 m.And wind in upward direction of 45 degrees will boost fire spread.
作者
张玉涛
张玉杰
李亚清
ZHANG Yutao;ZHANG Yujie;LI Yaqing(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi'an Shaanxi 710054,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第8期70-78,共9页
China Safety Science Journal
基金
国家自然科学基金资助(51974235,51774233,51604218)
国家重点研发计划项目(2018YFC0807900)
陕西省自然基金资助(2018JZ5007,2018JM5121)。
关键词
凹型结构建筑
挤塑聚苯乙烯(XPS)
外墙保温材料
防火隔离带
外界风
火灾蔓延
concave structural buildings
extruded polystyrene(XPS)
external wall insulation material
fire-barrier belt
outside wind
flame spread
