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A Unified Mechanism for Unconfined Deflagration-to-Detonation Transition in Terrestrial Chemical Systems and Type Ia Supernovae

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arxiv 1911.00050 v1 pith:LQNUV7XN submitted 2019-10-31 astro-ph.HE physics.flu-dyn

Alexei Y. Poludnenko , Jessica Chambers , Kareem Ahmed , Vadim N. Gamezo , Brian D. Taylor This is my paper · ORCID
classification astro-ph.HEphysics.flu-dyn
keywords chemicaldetonationmechanismsniathermonucleardeflagration-to-detonationexplosionsflames
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The nature of type Ia supernovae (SNIa) - thermonuclear explosions of white dwarf stars - is an open question in astrophysics. Virtually all existing theoretical models of normal, bright SNIa require the explosion to produce a detonation in order to consume all of stellar material, but the mechanism for the deflagration-to-detonation transition (DDT) remains unclear. We present a unified theory of turbulence-induced DDT that describes the mechanism and conditions for initiating detonation both in unconfined chemical and thermonuclear explosions. The model is validated using experiments with chemical flames and numerical simulations of thermonuclear flames. We use the developed theory to determine criteria for detonation initiation in the single degenerate Chandrasekhar-mass SNIa model, and show that DDT is almost inevitable at densities 10^7 - 10^8 g/cc.

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