Abstract
Using a shock tube, detonation waves of different strengths were produced in a stoichiometric propane-oxygen mixture and the cellular patterns marked on soot films were statistically investigated. From the histograms of the interval distance between two successive “triple shock collision points” the probability of formation of the triple shock collision point under different conditions was obtained and compared with the probability of spontaneous ignition in the same mixture obtained from the induction period of ignition behind reflected shock waves in a shock tube. The results suggest that the cellular patterns in the detonation waves are formed not by the triple shock collision in the concept of gas dynamics, but by the spontaneous ignition behind the shock waves at the detonation front accompanied by the isochoric combustion.
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