Before the rupture of the vent membrane, the ignited explosive flame started with a large initial velocity due to the instability of the initial stage of combustion of the explosive flame; 23 , 24 in the spherical flame to finger-shaped flame evolution stage, the explosive flame propagation velocity with the development of time showed a trend of oscillation and lasted for a certain period of time (about 20 ms or so).
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Study on the Influence of Vent Shape and Blockage Ratio on the Premixed Gas Explosion in the Chamber with a Small Aspect Ratio.
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The sentences
The same shape of the vent, the location of the flame front with the increase of the blockage ratio, and the growth rate showed a clear trend of acceleration.