摘要
针对某大型展览中心标准展厅的自然排烟系统,通过FDS数值模拟,研究夏季展厅室内屋顶热障效应对自然排烟的影响,以及自然排烟系统的优化设计。结果表明:热障效应对较大规模火灾的自然排烟影响不大,对较小规模的火灾,初期热障效应对羽流上升起到延迟作用,导致排烟延迟;通过设置一定高度的挡烟垂壁将展厅划分为若干防烟分区,以及采用屋顶排烟结合高位侧窗排烟的方式可以减弱热障效应。
Aiming at the natural smoke extraction in some large exhibition center,and utilizing FDS,study the influence of roof heat barrier to natural smoke extraction,and optimize the design of natural smoke extraction system.Results show that： the heat barrier doesn＇t have much influence to the natural smoke extraction of big fire,but can delay the raise of plume and the smoke extraction if the fire is small;by setting smoke-proof pendent wall of some height dividing the exhibition room into several smoke compartment,and by roof combining high side windows smoke exhaustion,can weaken the heat barrier effect.
出处
《消防科学与技术》
CAS
北大核心
2010年第9期760-764,共5页
Fire Science and Technology
关键词
大空间建筑
热障效应
自然排烟
火羽流
FDS
large-space building
heat barrier effect
natural smoke extraction
fire plume
FDS
