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The study of geometric effects on the explosion front propagation in a horizontal channel with a layer of spherical beads

Ciccarelli, G. and Hlouschko, S. and Johansen, C. and Karnesky, J. and Shepherd, J. E. (2009) The study of geometric effects on the explosion front propagation in a horizontal channel with a layer of spherical beads. Proceedings of the Combustion Institute, 32 (2). pp. 2299-2306. ISSN 1540-7489.

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Experiments were performed in a horizontal channel partially filled with a layer of 12.7 mm ceramic-oxide beads filled with a nitrogen-diluted stoichiometric methane–oxygen mixture, i.e., CH_4 + 2(O_2 + 2/3N_2). Ionization probes and pressure transducers were used to track the explosion front velocity in the 1.22 m long, 76 mm wide and 152 mm high horizontal channel. Schlieren photography and smoked foil techniques are used to gain insight into the explosion front structure. The explosion propagation phenomenon was characterized by the combustion in the bead layer and the unobstructed gap above. It was determined that for a fixed gap height the bead layer thickness had very little effect on the explosion propagation phenomenon. However, for a fixed bead layer height the explosion propagation was strongly influenced by the gap height. The combustion products vented from the bead layer behind the flame propagating in the gap affects the structure of the shock-flame front in the gap and the maximum flame velocity achieved. The coupling between the vented products and the flame velocity in the gap was strongly influenced by the gap height. The gap height also affects the structure of the detonation wave propagating in the gap following DDT that always occurred in the gap. The DDT run-up distance was found to increase with increasing gap height and inversely with initial pressure.

Item Type:Article
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Shepherd, J. E.0000-0003-3181-9310
Additional Information:© 2009 Elsevier Inc. Available online 5 October 2008. We are grateful to Hideaki Kusano and John Monti of the Shimadzu Corporation for the use of the Shimadzu Hypervision HPV-1 camera.
Subject Keywords:Explosion; Flame; Porous media; DDT; Shock wave
Issue or Number:2
Record Number:CaltechAUTHORS:20090430-134124237
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14126
Deposited By: Jason Perez
Deposited On:11 Aug 2009 17:48
Last Modified:03 Oct 2019 00:47

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