窗口溢流火条件下聚氨酯硬泡火蔓延特性

Fire spread characteristics of polyurethane rigid foam under window overflow fire

利用自主设计的大尺寸实验台,研究窗口溢流火条件下未阻燃和阻燃聚氨酯硬泡材料的火蔓延特性。结果表明,阻燃RPU的火蔓延受溢流火焰高度和热流强度的影响;溢流火焰的热穿透能力和材料的完整性是影响RPU燃烧强烈程度的重要因素;溢流火焰对RPU的热反馈作用将显著影响火蔓延速度。建立了窗口溢流火条件下聚氨酯硬泡竖直火蔓延的数值模型,对火焰热反馈、火焰高度等输入参数进行了探讨。对比分析可知,数值模型能较好地预测聚氨酯硬泡的火蔓延趋势。

Fire spread characteristics of non-flame-retardant and flame-retardant polyurethane foam under the conditions of external flame ejected from windows were studied using large scale lest rig. Results showed that, the fire spread of flame-retardant RPU is in fluenced by the height of overflow fire and heat flow intensity; the heat penetration ability of overflow fire and the material integrity have great influence on the intensity of the RPU combustion; the thermal feedback of the overflow fire on RPU will significant influ-ence the fire spreading. A numerical model of the vertical spreading of polyurethane foam under window overflow fire was established. The input parameters such as flame heat feedback and flame height were discussed. The comparison showed that the numerical model can well predict the fire spreading tendency of polyurethane rigid foam.