Reignition of detonations by reflected shocks |
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Authors: | D A Jones M Sichel E S Oran |
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Institution: | (1) Aeronautical and Maritime Research Laboratory, PO Box 4331, 3001 Melbourne, Victoria, Australia;(2) Department of Aerospace Engineering, University of Michigan, 48109-2140 Ann Arbor, MI, USA;(3) Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Code 6404, Washington, DC 20375, USA |
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Abstract: | Numerical simulations are used to study the diffraction, decay, and reignition that occurs when a detonation propagates past
an increase in cross-sectional area in a rectangular tube. The computations solve the time-dependent two-dimensional equations
describing a reactive flow in an argon-diluted stoichiometric hydrogen-oxygen mixture at atmospheric pressure. Previous studies
have shown that soon after transmission to a larger area, the reaction front decouples from the leading shock and forms a
decaying blast wave (“bubble”) in the larger tube. Then, depending on the initial conditions, the detonation either continues
to decay or is reignited as the bubble reflects off confining surfaces. For a strongly overdriven initiating detonation, reignition
occurs through an interaction between the bubble and the original contact surface. For a more weakly driven system, reignition
can occur in two ways: either in the slip line and Mach stem of the Mach reflection formed when the bubble reflects off the
bottom surface of the tube, or by multiple shock interactions that occur when the reflected bubble overtakes the initial detonation
front. The computations show the evolution and development of the cellular structure of the steady detonation front.
Submitted to the 14th International Colloquium on the Dynamics of Energetic and Reactive Systems, Coimbra, Portugal, August,
1993 |
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Keywords: | Numerical simulation Detonation reignition Cellular structure Mach reflection reaction front |
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