Study on propagation characteristics of benzene vapor explosion and combustion flame

doi:10.16265/j.cnki.issn1003-3033.2019.03.009

Abstract

Abstract: In order to explore the propagation characteristics of explosion and combustion flame of the benzene vapor, explosion and combustion experiments of different concentrations of benzene vapor were carried out in a self-designed 1m transparent explosion test pipeline. The high-speed camera was used to capture images of flame propagation of benzene vapor explosion in the pipeline. The flame images were compared and analyzed. The results show that a violent explosion reaction occurs when the low concentration of premixed benzene vapor-air gases are ignited, and the violent explosion reaction turns into a mild combustion reaction with the increase of concentration of benzene vapor in the premixed gases. The average flame propagation velocity increases with the rise of benzene vapor concentration, and reaches a maximum when the volume fraction of benzene vapor is 2.8%. Then the velocity decreases with increasing benzene vapor concentration. The propagation process of explosion flame of low concentration benzene vapor can be divided into four stages: a rapid accelerating stage, a rapid decelerating stage, a slow accelerating stage and a slow decelerating stage. The propagation speed of high-concentration benzene vapor flame basically keeps constant, and the flame shape is closely related to flame propagation speed.

Key words: benzene vapor, explosion, propagation velocity, high-speed photography, flame

CLC Number:

X932

GAO Jiancun, ZHOU Shangyong, HU Shoutao, WANG Le, SUN Xu. Study on propagation characteristics of benzene vapor explosion and combustion flame[J]. China Safety Science Journal, 2019, 29(3): 51-56.

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