中文摘要：

对密度为18和25 kg/m3的保温材料模塑聚苯乙烯（EPS）,在不同宽度下进行小尺寸燃烧特性实验,考察了池火区长度、火焰高度及火蔓延速度等.结果表明,EPS火焰蔓延过程中,火焰形态包括典型形态、逆向形态及重合形态;宽度为8 cm的试样火焰蔓延稳定性较差,逆向形态及重合形态更多.不同宽度、密度18 kg/m3的EPS的平均池火长度均大于密度25 kg/m3的EPS,主要是由于EPS密度越小其火蔓延速度越大.密度18 kg/m3的EPS由于孔隙中空气的助燃作用,火蔓延速度约为密度25 kg/m3的EPS的2倍.EPS材料表面火焰区平均火焰高度主要受宽度影响,而池火区平均火焰高度主要受池火区长宽比影响.

英文摘要：

A series of lab-scale experiments were carried out for expandable polystyrene（EPS） with the densities of 18 and 25 kg/m3 and widths of 4, 8, 12 and 16 cm respectively. The representative parameters such as the length of pool fire zone, flame height and flame spread speed, were investigated. The results showed that the flame structures of EPS during flame spread process included the typical type, the reverse type and merged type. When the width of the sample was 8 cm, the flame structures behaved almost as the reverse and merged types for the worse instability of flame during spread. The average length of pool fire wais longer for 18 kg/m3 than for 25 kg/m3 with the same width, which can be attributed to the faster flame spread speed with the lower density for EPS. The flame spread speed of EPS with the density of 18 kg/m3 was almost two times of that with the density of 25 kg/m3, due to the air in the cells which promotes combustion. It was also found that the surface flame height was mostly controlled by the width of EPS, while the flame height in the pool fire was mostly controlled by the ratio of the length to the width of the pool fire.