坡地建筑外立面火灾温度演化研究

针对坡地建筑外立面开口火溢流行为,为了预测不同坡地角度时圆形开口建筑火溢流的外立面热羽流温度分布规律,采用1∶8缩尺寸建筑火灾模型,开展圆形开口建筑火溢流实验研究。结果表明:在建筑火灾燃烧状态稳定下,对于确定开口尺寸、火源功率以及坡地坡度(倾斜挡墙)下,带有圆形开口的燃烧室内温度基本均匀且保持一致;针对圆形开口建筑,倾斜挡墙坡度越大,外立面的温度越高;基于热羽流温度实验数据,建立考虑不同开口尺寸、火源功率和倾斜挡墙角度影响下圆形开口建筑火灾溢出热羽流的竖向温度预测模型。

Study on temperature evolution in external facade fire of slope building

In view of the flame overflow behavior from the external fa ade opening of the slope building,in order to predict the temperature distribution of the external facade thermal plume in the flame overflow of building with circular opening under different slope angles,a 1∶8 reduced-size building fire model was used to carry out the experimental study on the flame overflow of building with circular opening.The results showed that under the stable combustion state of building fire,the temperature in the combustion chamber with circular opening was basically uniform and consistent when the opening size,fire source power and slope gradient(inclined retaining wall)were certain.The fire of building with circular opening was similar to the chamber fire of building with rectangular opening,and the larger the slope of inclined retaining wall,the higher the temperature of external facade.Based on the experimental data of thermal plume temperature,a prediction model on the vertical temperature of thermal plume in the flame overflow of building with circular opening considering the influence of different opening sizes,fire source power and inclined retaining wall angles was established.