拉萨和合肥环境下不同厚度保温材料XPS的火蔓延特性

Thickness Effect on Flame Spread Characteristics of Extruded Polystyrene in Lhasa and Hefei Environments

分别对不同厚度保温材料XPS在高原地区拉萨和平原地区合肥进行一系列小尺寸火蔓延实验.通过分析在水平放置时,不同厚度保温材料在两地火蔓延过程中一些重要特性参数(火蔓延速度、平均池火长度、火焰侧面积和最高气相火焰温度等)的变化规律,定性地揭示了高原和平原环境对不同厚度保温材料XPS火蔓延特性参数的影响.结果表明,在拉萨火蔓延速度随着保温材料厚度的增加而增加,而在合肥却没有这种规律;无论在拉萨还是在合肥,平均池火长度、平均火焰侧面积均随着保温材料厚度的增加而增加;对于同种厚度的XPS,其在合肥地区的火蔓延速度、平均池火长度、平均火焰侧面积都大于拉萨地区,而最高气相火焰温度在合肥地区却呈现出略低于拉萨地区的特点.

A series of experiments were carried out in a small-scale flame spread experimental bench in Lhasa plateau and Hefei plain, respectively, with XPS sample of different thicknesses placed horizontally. The variations of some important parameters such as flame spread speed, average length of pool fire, lateral flame area and maximum gas flame temperature were analysed on XPS of different thicknesses during the flame spread process in the two places, qualitatively revealing the effect of plateau and plain environments on flame spread characteristics. The results show that, in Lhasa, flame spread speed increases with thickness, which does not occur in Hefei. The average length of pool fire and the average lateral flame area increase with the increase of thickness in both Lhasa and Hefei. For the XPS of the same thickness, the values of flame spread speed, average length of pool fire and average lateral flame area in Hefei are all larger than those in Lhasa, while the maximum gas flame temperature in Hefei is slightly lower than that in Lhasa.