Numerical Simulation of Afterburning during Explosions
In this paper the unconfined and semi-confined TNT air blasts are studied using Large Eddy Simulations (LES) based on the unsteady, compressible, reacting, multi-species Navier-Stokes equations to examine the physical processes involved in the afterburning stage of a condensed phase explosion along with the effects of confinement on mixing and combustion during an air blast. The mixing layer evolution is found to be closely connected to the shock propagation pattern and its consequent effects of the generation of flow instabilities. A further analysis of afterburning confirms the correlation of the shock generated instabilities sustaining the mixing as well as fueling the combustion regions around the vorticity structures where the afterburning occurs.
KeywordsLarge Eddy Simulation Blast Wave Rarefaction Wave Vorticity Structure Detonation Product
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