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Science and Technology of Energetic Materials

Vol.72, No.2 (2011)

Research paper

Experiments on detonation initiation and propagation in extremely thin channels
Shunsuke Hasegawa, Masashi Shimizu, Akio Susa, and Takuma Endo
p.62-67

Abstract

Initiation and propagation characteristics of detonations in extremely thin channels were experimentally studied using a soot-foil-pattern technique. In the experiments, we used stoichiometric propane-oxygen-nitrogen and hydrogen-oxygennitrogen gas mixtures, where dilution ratio was varied as a governing parameter. A thin channel, whose height was varied as another governing parameter, was installed inside a large reaction chamber. The reaction chamber was filled with a premixed gas mixture at the ambient conditions of temperature and pressure, and the gas mixture was ignited on an inner wall of the reaction chamber. When a flame went into the thin channel, a detonation was initiated in the thin channel in some conditions. Especially, in some highly-diluted conditions, a detonation was initiated in the thin channel whereas no detonation was initiated outside the thin channel in the reaction chamber. In the conditions near the limit of detonation initiation, peculiar soot-foil patterns were observed for hydrogen-oxygen-nitrogen gas mixtures, which showed unstable double cellular structure.

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Keywords

detonation, initiation, thin channel, double cellular structure

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