基于火焰面积法的产气药剂燃烧稳定性研究

Study on the combustion stability of gas generant based on flame area analysis

间歇性爆喷是非储压式干粉灭火装置使用时的常见问题,与产气剂配方、混合均匀程度和结构有关,而燃烧稳定性是影响产气剂燃烧效果的直接表现。基于一种产气剂配方,分别采用机械混合与冷冻干燥两种制备方法,利用高速摄影仪,对产气剂燃烧稳定性进行了研究。用扫描电子显微镜表征形貌,显示出冷冻干燥法在混合均匀度上明显优于机械混合。通过MATLAB量化燃烧火焰面积,结果表明:当对稳定燃烧时段与总燃烧时间的比值进行比较时,机械混合药剂平均值仅有13%,冷冻干燥药剂达到35.19%;当对稳定燃烧阶段的平均火焰面积变化标准差进行比较时,机械混合药剂为9.263,冷冻干燥药剂为5.924。

Intermittent explosion spray is a common problem when using dry powder fire extinguishing device. This problem is related to the formulation, uniformity and structure of the gas generating agent while the combustion stability is a direct manifestation of the combustion effect of the gas generating agent. In this paper, a kind of gas generating agent was prepared by mechanical mixing and freeze-drying, and the combustion stability of the gas generating agent is analyzed by high-speed camera. The scanning electron microscopy(SEM) was used to characterize the morphology of gas generating agent. The SEM images showed that the freeze-drying method was significantly better than mechanical mixing in the uniformity of samples. The combustion flame area is quantified by Matlab, and the results indicate that when comparing the ratio of the stable combustion time to the total combustion time, the average value of the mechanical mixing agent is only13% while the freeze-drying agent reaches to 35.19%;when comparing the standard deviation of average flame area in the stable combustion stage, the mechanical mixing agent is 9.263 while the freeze-drying agent is 5.924.