热塑性外保温材料火蔓延规律研究

Study on fire propagation law of thermoplastic external insulation materials

根据火灾动力学理论,考虑材料厚度和火源位置对材料燃烧发展过程的影响,建立了热塑性外保温材料无量纲火蔓延速率模型,提出了表征向上火蔓延和向下熔融流淌燃烧相互促进作用大小的指标—耦合燃烧度(I)。通过以材料厚度和火源位置为变量进行实验,研究了热塑性外保温材料火蔓延速率随时间呈指数增长,验证了模型的准确性,获得了不同厚度、不同火源位置条件下的耦合燃烧度,得出了耦合燃烧度(I)与火蔓延增长速度呈正比。

In this paper,based on the theory of fire dynamics,considering the influence of the thickness of the material and the position of the ignition source on the combustion process,and a dimensionless fire spreading rate model of thermoplastic external thermal insulation material was established,and the coupling combustion degree was proposed to characterize the mutual promotion between upward fire spread and downward melt flow combustion.By taking the thickness of the material and the position of the fire source as variables,the results show that the fire spreading rate of the thermoplastic external thermal insulation material increases exponentially with time,and the accuracy of the model is verified,and the coupling degree of combustion under different thickness and different position of ignition source was obtained,and the results show that the cou-pling combustion degree is proportional to the growth rate of fire spread.