高速热颗粒点燃聚苯乙烯泡沫的实验研究

Experimental Study on Ignition of EPS Foam by High-Speed Hot Particle

热颗粒点燃建筑保温材料是导致城市-森林火灾发生的重要潜在途径,热颗粒从产生位置输运至燃料床通常被赋予一定的初始速度,目前研究尚未关注高速状态下热颗粒冲击点燃建筑保温材料的点燃现象和点火规律。本研究设计了热颗粒的加速点火实验装置,研究了13 m/s速度下8~16 mm粒径热颗粒在不同温度下的点火过程。观察到了嵌入点火和接触闪火等点火现象,发现表面嵌入具有更高的点火危险性,容易引发火焰的加速传播。此外,还发现颗粒的嵌入规律与颗粒温度密切相关,得到不同粒径下高速热颗粒的点火概率分布规律。本项研究对于理解高速热颗粒的点火过程具有重要的科学指导。

The ignition of building insulation materials by hot particles is an important potential pathway leading to urban-forest fires,and the transport of hot particles from their location to the fuel bed usually has a certain initial velocity,and the phenomenon and mechanism of hot particles igniting polystyrene foam at high speed are still unclear.This study designed an accelerated ignition experimental device for hot particles and tested the ignition process of hot particles with a diameter of 8~16 mm at 13 m/s speeds and different temperatures.The study observed various ignition phe-nomena,including embedded ignition and contact flash fire,and concluded that surface embeddings pose a higher risk of ignition,thereby potentially accelerating flame propagation.The embedding law of particles was found to be closely correlated with particle temperature,and the probability distribution of ignition for high-speed hot particles was obtained for different particle sizes.This study provides important scientific guidance for understanding the ignition process of high-speed hot particles and has practical significance for building fire safety.