防火挑檐对建筑外立面窗口火溢流行为特征的影响  

Effects of Horizontal Projection on Facade Flame Behavior Ejected from Windows

作　　者：付佳佳[1] 李引擎[1] 张靖岩[1] 

机构地区：[1]中国建筑科学研究院防火所,北京100013

出　　处：《建筑科学》2016年第3期56-60,共5页Building Science

基　　金：国家973计划项目(2012CB719702)

摘　　要：本文通过建立1∶2的中尺寸试验台,通过试验研究防火挑檐作用下建筑外立面开口火溢流行为特征,验证Lee Yee-Ping提出的建筑外立面无量纲温度模型适用于无防火挑檐下的本试验台。试验表明:对于通风控制的单室燃烧,燃烧室内平均温度主要取决于通风因子的大小;建筑外立面防火挑檐改变了窗口火溢流的轨迹,使窗口溢出的热烟气远离上层窗口,降低了上层窗口附近的温度,但同时增大了下层建筑和相邻建筑的火灾危险性。An experiment is carried out to study the behavior characteristics of building facade opening fire under horizontal projection,through the establishment of a ratio of 1 ∶ 2 size test rig. The experiment is to verify if the dimensionless temperature model that Lee Yee-Ping proposed is suitable for the present test station without horizontal projection. The test results show that the ventilation factor plays an important role in average temperature of the combustion chamber under the ventilation control. The trajectory of window outflow hot gases is changed by the existence of the horizontal projection. The temperature near the upper window effectively decreases due to fire plume away from the upper window while the fire hazards of the lower and adjacent building are increased.

关 键 词：防火挑檐 火溢流 建筑外立面 

分 类 号：TU352.5[建筑科学—结构工程]