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对密度为18和25 kg/m~3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/m~3的EPS的平均池火长度均大于密度25 kg/m~3的EPS,主要是由于EPS密度越小其火蔓延速度越大.密度18 kg/m~3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/m~3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.
Polystyrene (EPS) was molded on insulation materials with density of 18 and 25 kg / m ~ 3, and the small size combustion characteristics under different widths were investigated. The length of fire zone, flame height and fire spread rate were investigated. The results show that the shape of flames includes the typical morphology, the reverse morphology and the coincidence morphology during flame spread of EPS. The flame propagation stability of the sample with width of 8 cm is poor, and the reverse morphology and the coincidence morphology are more. Different width and density of 18 kg / m The average pool fire length of ~ 3 EPS was greater than that of EPS with a density of 25 kg / m ~ 3, which was mainly due to the greater spread of fire due to the smaller EPS density. EPS with a density of 18 kg / m3 was due to the air- , The spread rate of fire is about twice that of EPS with a density of 25 kg / m ~ 3. The average flame height of the flame zone on the surface of the EPS material is mainly affected by the width, while the average flame height of the pool fire zone is mainly affected by the aspect ratio of the pool fire zone.