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Numerical Study of the Detonation Wave Structure in Ethylene-oxygen Mixtures

Khokhlov, A. M. and Austin, J. M. and Pintgen, F. and Shepherd, J. E. (2004) Numerical Study of the Detonation Wave Structure in Ethylene-oxygen Mixtures. In: 42nd AIAA Aerospace Sciences Meeting and Exhibit. AIAA , Reston, VA. ISBN 978-1-62410-078-9.

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We examine a transition from a weakly to a highly unstable regime of a cellular detonation in stoichiometric ethylene-oxygen systems with varied dilution. The structure and propagation of cellular detonations is calculated using two-dimensional, time-dependent, reactive Euler fluid-dynamics algorithm. A dynamically adapting mesh is used to resolve reaction zones, shocks, contact surfaces, and vortices in flow. A simplified chemical model with Arrhenius kinetics is used for all mixtures. Effects of dilution are modeled by varying the adiabatic index γ and molecular weight of matter. Results are compared to experimental data obtained in a detonation tube by simultaneous visualization of a chemical species (OH), density gradients in the reaction zone, and to soot foil records. Due to a strong sensitivity of the post-shock temperature to variations of γ, the degree of chemical - fluid dynamics coupling inside the detonation structure varies significantly with dilution. Variations of the equation of state with dilution can account for and could be the main mechanism explaining a wide range of detonation behavior observed in the experiments.

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Shepherd, J. E.0000-0003-3181-9310
Additional Information:© 2004 by the University of Chicago, California Institute of Technology. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. AIAA 2004-0792.
Record Number:CaltechAUTHORS:20140930-083310072
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50113
Deposited By: Tony Diaz
Deposited On:03 Oct 2014 23:15
Last Modified:10 Nov 2021 18:52

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