Abstract
The effect of the initiation step of a reaction mechanism on direct initiation of a self-sustained detonation has been studied numerically. For this purpose, the reaction mechanism has been simulated with a three-step chemical kinetics model that consists sequentially of the chain-initiation and chain-branching steps, followed by chain termination. A characteristic time τ I is defined for each step of the mechanism, which includes effects of different kinetics parameters. It is shown that τ I is a determining factor of the minimum allowable shock pressure. It is observed that the minimum shock pressure in the decaying period of critical initiation tends to the von Neumann pressure when τ I becomes large. As a result, at large τ I , the critical initiation becomes similar to the supercritical initiation. On the other hand, the amplification mechanism of the leading shock in the decaying period depends on τ I .
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Translated from Fizika Goreniya i Vzryva, Vol. 46, No. 3, pp. 95–102, May–June, 2010.
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Hashemi, S.A., Fattahi, A. Effect of the chain initiation reaction rate on direct initiation of detonation. Combust Explos Shock Waves 46, 325–331 (2010). https://doi.org/10.1007/s10573-010-0045-1
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DOI: https://doi.org/10.1007/s10573-010-0045-1