垂直竖井中烟囱效应诱导火羽流结构的简化模型研究  

Study on a simple model for flame plume induced by stack effect in vertical shaft

作　　者：张靖岩[1] 

机构地区：[1]中国建筑科学研究院建筑防火研究所,北京100013

出　　处：《中国安全生产科学技术》2008年第2期26-30,共5页Journal of Safety Science and Technology

基　　金：国家"十一五"科技支撑计划重点项目"大型及重要建筑安全监测预警集成技术研究与示范"(课题编号:2006BAJ13B03)

摘　　要：本文基于质量、动量及浮力方程和一系列全尺寸实验,得到了竖井中由于烟囱效应诱导产生的倾斜火羽流结构简化模型。结果显示,火羽流结构呈对称形态,并且火羽流迎风面与背风面距离与高度呈线性关系。与隧道内的倾斜羽流不同,随着受迫卷吸作用被强化(外加来流速度增加),隧道内的火羽流倾斜角度增加;但是在垂直竖井中,由于烟囱效应导致的主动卷吸作用,迎风侧的羽流倾斜角度基本维持在50度到60度之间。The tilted flame plume model induced by stack effect was developed simply based on the fundamental equations for continuity, momentum, and buoyancy with some physical assumption and a series of full-scale tests. The results showed that the two sides of flame plume were symmetrical and had an accordant regulation that the flame plume diameter shows a linear relation to the height z. The tilted plume was different from that in wind tunnel. With the forced air-entrainment was enhanced, the deflection angle of plume increased in wind tunnel. But in vertical shaft, due to stack effect, the deflection angle range of windward of flame plume was in the range of 50 to 60 degree.

关 键 词：烟囱效应 倾斜羽流 火羽流直径 火焰倾斜角 卷吸 

分 类 号：X928[环境科学与工程—安全科学]