基于高速摄影技术的苯蒸气爆炸现象研究

在自主设计加工的长度1 m透明爆炸实验管道内,进行不同浓度苯蒸气的爆炸实验。通过高速摄像仪拍摄管道内苯蒸气爆炸的火焰传播情况,并进行对比分析。结果表明:低浓度苯蒸气的爆炸火焰前端形态经历了4个阶段的变化,依次是"半椭圆"状火焰,"漏斗"状火焰,"郁金香"状火焰和"斜面"状火焰;低浓度苯蒸气点火后发生剧烈爆炸反应,高浓度苯蒸气点火后发生相对温和燃烧反应;低浓度苯蒸气爆炸火焰存续时间较短,边缘有蓝色火焰,高浓度苯蒸气燃烧火焰存续时间长,火焰颜色为明亮的黄色,无蓝色火焰。

Study on Benzene Vapor Explosion Based on High-Speed Photography Technology

Explosion tests of different concentrations of benzene vapor were carried out in a 1 m transparent explosion test pipeline designed and processed by ourselves.The flame propagation of the benzene vapor explosion in the pipeline was photographed by a high-speed camera,and the flame image was compared and analyzed.The results show that the front part of the explosion flame of low concentration benzene vapor has undergone four stages of changes,followed by a“semi-elliptical”flame,a“funnel”flame,a“tulip”flame and a“bevel”flame.A violent explosion reaction occurs after ignition of a low concentration of benzene vapor,and a relatively mild combustion reaction occurs after ignition of a high concentration of benzene vapor.Low concentration benzene vapor explosion flame has a short retention time and a blue flame at the edge of the flame.And the high concentration benzene vapor combustion flame has a long retention time,showing bright yellow color,and no blue flame appears.