摘要
为了解多层建筑火灾的蔓延发展和烟气运动,应用大涡模拟(LES)方法对多层建筑火灾发生过程进行数值模拟分析,模拟不同工况下走廊和各楼层中火灾烟气运动和温度的变化情况。尤其针对内部含有竖井的多层建筑,考虑到烟囱效应对火灾发展和烟气蔓延的影响,分别设置自然排烟和机械排烟的实验工况,分析电梯间通风口在自然排烟和机械排烟状况下火灾的发展和烟气运动。通过分析温度和能见度数据,发现合理安排机械排烟能够争取更多人员逃生时间。对于多层建筑火灾中发生的回燃现象进行了原因分析。
In order to learn fire expand and and analyzed by use of LES method. Chang smoke flow in a multi-storey building, the fire process was simulated e of smoke concentration and temperature in staircase and aisle with different fire conditions were simulated. Especially with vertical shaft, considering the influence of stack effect, setting natural and mechanical smoke exhaust separately, analyzing the fire spread and smoke movement at vent of elevator hoist way under different conditions. It was found that appropriate mechanical smoke exhaust can obtain more time for people escape, on the basis of analyzing temperature and visibility data. Backdraft occurrence in multi-storey building fire was analyzed.
出处
《中国安全生产科学技术》
CAS
北大核心
2009年第2期28-31,共4页
Journal of Safety Science and Technology
关键词
多层建筑火灾
烟气运动
FDS模拟
自然排烟
机械排烟
回燃
multi-storey building fires
smoke flow
fire dynamics simulator
natural smoke exhaust
mechanical smoke exhaust
backdraft
