高大空间自然火灾温度场时空分布实验研究

Experimental study on temporal and spatial distribution of temperature field of natural fire in large space building

开展高大空间大尺寸实体火灾实验,对高大空间温度场预测模型进行研究。通过对烟气温度曲线的最大温度、火灾进入衰退阶段的时间点以及曲线基本形状的构建,建立表达高大空间火灾全过程温度曲线的数学模型,并与已有的模型进行对比分析,发现三个模型均能够较好地预测高大空间自然火灾温度场变化及温度场的非均匀分布特征。提出的模型在火灾全盛阶段理论预测值与实验值吻合度较高,能够较好地反映火灾衰退阶段的温度场。

Full-scale physical experiments on fires in large spaces were carried out to research the prediction model of temperature field in large space.By constructing the maximum temperature of the smoke temperature curve,the time point when the fire enters the decline stage,and the basic shape of the curve,a mathematical model to express the whole process temperature curve of fire in large space was established and was researched contrastively against the other two models.The results showed that the change and non-uniform of temperature distribution of natural fires in large spaces can be predicted by both 3 models.The theoretical prediction value of the new model is in good agreement with the experi⁃mental value in the peak stage of fire,and can reflect the gradual attenuation of temperature fields in the fire better during the decay phase.