点火方式对受限空间油气爆燃规律的影响

通过可视化和数据分析方法,针对电火花、突遇高温热壁、直接加热热源和持续加热热壁4种常见的点火方式,对油气在受限空间的整个爆燃过程进行了对比分析。不同点火方式下油气爆燃的起燃条件、起燃速度、火焰结构、火焰颜色存在很大的区别,并进行了细节分析。尽管油气在受限空间的爆燃过程都呈现出4个阶段,但火焰颜色、持续时间对不同的点火方式是不同的。通过对最大爆炸超压和超压典型曲线的分析,最大爆炸超压由大到小的点火方式依次是突遇高温热壁、电火花、直接加热热源和持续加热热壁,并分析了受限空间中超压曲线的典型特征。

Effect of ignition node on gasoline-air deflagration behavior in confined space

For four daily ignition modes, including electric spark, hot wall suddenly touched, hot resource direct heated and hot wall continuous heated, a comparative analysis of the whole process of gasoline-air deflagration in confined space was made through visualization experiment and data analysis. There were great differences in ignition condition, combustion speed, flame structure and flame color for gasoline-air deflagration under different ignition mode. Although there were four stages during the process of gasoline-air deflagration in confined space, their duration time and flame color were all different. According to analysis for maximum explosion overpressure and explosion pressure curves, the ignition modes of maximum explosion overpressure from big to small were hot wall suddenly touched, electric spark, hot resource direct heated and hot wall continuous heated. At the same time the typical features of overpressure curve was analyzed.