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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.650
pages 622-632

FIRST-PRINCIPLES SIMULATION OP GAS-PHASE DDT AND THE EFFECTS OF HOT-SPOT FORMATION

Elaine S. Oran
Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington DC, 20375, USA
Alexei M. Khokhlov
Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington DC, 20375, USA

ABSTRACT

A series of multidimensional numerical simulations were used to investigate how a turbulent deflagration may undergo a transition into a detonation, the process of deflagration-to-detonation transition (DDT). The reactive Navier-Stokes equations were solved on an adaptive mesh that resolved selected features of the flow including the structure of the laminar flame. The chemical and thermophysical models used reproduced the flame and detonation properties of acetylene in air over a range of temperatures and pressures. The interactions of an incident shock with the initially laminar flame lead to the formation of secondary shocks, rarefactions, contact surfaces, and boundary layers that continued to distort the flame surface, eventually creating a turbulent flame-brush. Pressure fluctuations were shown to be the seeds for hot spots in unreacted material. These hot spots undergo transitions to detonations when the gradients in induction time in the hot spot allowed the formation of supersonic spontaneous waves. This paper begins the process of examining the special effects of boundary layers generated by flames, shocks, and their interactions.


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