Physical Mechanisms of High-Enthalpy Initiation
A. P. Ershov, A. O. Kashkarov, E. R. Pruuel
Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
ers@hydro.nsc.ru
Keywords: детонация, инициирование, конвективное горение, переход горения в детонацию, двухфазные среды, detonation, initiation, convective combustion, deflagration-to-detonation transition, two-phase media
Abstract
Injection of a hot gas flow produced by an external source into a powdered explosive allows very fast (within a few microseconds) deflagration-to-detonation transition. Under this high-enthalpy initiation conditions, the process begins with the stage of convective combustion, and the initial velocity of the wave is about 1 km/s. The combustion kinetics known from the literature does not provide the observed rapid development of the process. Various mechanisms of acceleration of the reaction are considered. Results of calculation for a two-phase gas-dynamic model are compared with data of synchrotron diagnostics (set of density profiles in the wave).
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