侧向风速对聚氨酯材料水平逆流火蔓延实验探究

Experimental Research on Lateral Wind Speed to Horizontal Countercurrent Fire Spread of Polyurethane Materials

针对建筑立面与环境风作用对聚氨酯保温材料的水平火蔓延行为进行探究。结果表明:风速对于高层建筑物上层的影响大于下层;熔融液滴落频率和质量随着风速的增加而增大,当风速越大时,火灾过程中会产生更加剧烈的熔融滴落现象,熔融滴的随机滴落会引燃未燃区域,形成多火源火灾,火蔓延速度大大加快;水平火蔓延过程中,下侧辐射热通量始终大于上侧,但随着风速的增大,上下侧之间的热通量差值不断缩小。实验结论有助于进行高层建筑火灾事故分析,协助制定高层建筑火灾事故防治方案。

This article investigates the horizontal fire spread behavior of polyurethane insulation materials based on the effect of building facade and environmental wind.The results show that the effect of wind speed on the upper layer of high-rise buildings is greater than that on the lower layer;with the increase of wind speed,the frequency and mass of molten droplets increase,and random dripping will ignite the unburned area and form a fire with multiple fire sources;the speed of fire spreading is thengreatly accelerated.During the horizontal fire spreading process,the radiant heat flux in the lower part is always greater than that in the upper part.The difference in heat flux between them is shrinking.The conclusion of this experiment is helpful for the analysis of high-rise building fire accidents,and assists in the formulation of high-rise building fire accident prevention plans.