Numerical simulation of detonation reignition in H
$_2$-O
$_2$ mixtures in area expansions |
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| Authors: | DA Jones G Kemister NA Tonello ES Oran M Sichel |
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| Institution: | (1) Aeronautical and Maritime Research Laboratory, DSTO, PO Box 4331, Victoria 3001, Australia, AU;(2) CRAFT, Tech., 174 North Main Street, Bldg. 3, PO Box 1150, Dublin, PA 18917, USA, US;(3) Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Code 6404, Washington, DC 20375, USA, US;(4) Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109-2140, USA, US |
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| Abstract: | Time-dependent, two-dimensional, numerical simulations of a transmitted detonation show reignition occuring by one of two
mechanisms. The first mechanism involves the collision of triple points as they expand along a decaying shock front. In the
second mechanism ignition results from the coalescence of a number of small, relatively high pressure regions left over from
the decay of weakened transverse waves. The simulations were performed using an improved chemical kinetic model for stoichiometric
H-O mixtures. The initial conditions were a propagating, two-dimensional detonation resolved enough to show transverse wave structure.
The calculations provide clarification of the reignition mechanism seen in previous H-O-Ar simulations, and again demonstrate that the transverse wave structure of the detonation front is critical to the reignition
process.
Received 16 July 1998/ Accepted 17 November 1998 |
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| Keywords: | : Detonation reignition H $_2$-O $_2$ detonations Multidimensional detonation dynamics Transmitted detonations |
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