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The mechanism of detonation attenuation by a porous medium and its subsequent re-initiation

Published online by Cambridge University Press:  14 January 2011

MATEI I. RADULESCU  and
BRIAN McN. MAXWELL
MATEI I. RADULESCU*
Affiliation:
Department of Mechanical Engineering, University of Ottawa, 161 Louis-Pasteur, Ottawa, ON, CanadaK1N 6N5
BRIAN McN. MAXWELL
Affiliation:
Department of Mechanical Engineering, University of Ottawa, 161 Louis-Pasteur, Ottawa, ON, CanadaK1N 6N5
*
†Email address for correspondence: matei@uottawa.ca
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Abstract

The attenuation and re-initiation mechanism of detonations transmitted through a porous section consisting of a two-dimensional array of staggered cylinders was investigated experimentally and numerically for acetylene–oxygen mixtures. It was found that the leading order attenuation mechanism is the wave diffraction around the cylinders. The local re-amplification permitting the self-propagation of the wave was due to wave reflections from adjacent obstacles. The critical conditions for transmittance of a detonation wave were found to correspond approximately to a pore size equal to approximately 30–60 detonation induction lengths, or one to two cell sizes. For quenched detonations, the re-initiation mechanism was found to rely on wave reflections from neighbouring pores. Depending on the mixture sensitivity, one or several shock reflections may be necessary to re-amplify the attenuated detonation wave back to a self-sustained wave. For the latter case, a novel mechanism was identified, where each shock reflection gives rise to a significant enhancement of the gas reactivity and burnout of large portions of unreacted gas. This leads to a slow acceleration of the leading front, punctuated by small-scale local sudden re-accelerations. The resulting wave interactions give rise to a topologically complex reaction zone structure consisting of alternating layers of reacted and unreacted gas. The role of turbulent diffusive burning during this transient is discussed.

JFM classification

Compressible Flows: Detonation waves Compressible Flows: Gas dynamics Compressible Flows: Shock waves
Type
Papers
Information
Journal of Fluid Mechanics , Volume 667 , 25 January 2011 , pp. 96 - 134
Copyright
Copyright © Cambridge University Press 2011

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