侧墙建筑羽流火焰高度计算公式及其影响因素研究  

Practical formula and the influential factors of the height of the plume flame in the building with a side wall

作　　者：王宇[1] 张敬义 李世鹏 WANG Yu;ZHANG Jing-yi;LI Shi-peng(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,110168,China)

机构地区：[1]沈阳建筑大学土木工程学院

出　　处：《安全与环境学报》2018年第5期1799-1804,共6页Journal of Safety and Environment

基　　金：辽宁省自然科学基金项目(201602628)

摘　　要：研究有侧墙的凹字型建筑纵向相邻多窗口羽流火焰的融合机理,定义危险温度T、T1及T2,得到危险温度高度与各影响因素之间的实用计算公式。采用软件PyroSim对不同结构因子、窗口尺寸、火灾荷载密度及纵向窗口数量等因素影响下的火灾建筑模型进行数值模拟,并根据模拟所得数据绘制窗口温度曲线与温度分布等温线。结果表明：结构因子与烟囱效应的影响程度呈正相关;作为对高层建筑外部火蔓延起决定性作用的T1和T2,其高度在纵向相邻两窗口比单窗口提升了0. 3-6. 1 m,纵向相邻三窗口比纵向相邻两窗口提升了0. 0-4. 5 m;分析模拟数据,参考前人研究成果,得到危险温度T1和T2高度的实用计算公式。This paper devotes itself to a study of the fusion mech- anism of the vertically adjacent muhi-window plume flames in the side wall construction. For the study purpose, we have made a categorical definition of the dangerous temperatures known as T, T1 and T2, which are well in accord respectively with the assessment temperatures of the window plume flame heights, and, those of the polystyrene foam and the window glass crushing situation. The aforementioned analysis of the data obtained from our simulated study has made us gain a practical formula for calculating the heights of the dangerous temperatures and its influencing factors. What is more, we have also managed to establish a fire building model in the paper by using a software known as the PyroSim and conducted numerical simulations on the models under the influence of such different structural factors, window sizes, the load density and the numbers of the longitudinal windows. And, next, we have also recorded the thermo-couples of the windows involved according to the simulated data and the slice recorded longitudinal temperature distribution isotherms. The simulation results we have gained demonstrate that the presence of the side wall is prone to lead to the chimney effects, whose degree of influence should be proportional to the factors of the side wall structure itsell Moreover, as Tl and T2 tend to play a decisive role in the fire propagation and spreading outwardly in the high-rise buildings, while the chimney effect should also be taking place in a direction longitudinally adjacent. For example, if the 2 windows are situated 0. 3 -6. 1 m over a single window, the vertically adjacent three windows should be spaced in a distance at about 0 - 4. 5 m higher than the vertically adjacent 2 windows, with the dangerous temperatures T1 and T2 of the vertically adjacent three windows being obviously higher than those of the 2 adjacent longitudinally adjacent ones. Therefore, it would be necessary to analyze the relation between the heights of the dangerous te

关 键 词：安全工程 羽流火焰 危险温度 结构因子 火灾荷载密度 烟囱效应 

分 类 号：X932[环境科学与工程—安全科学]