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Direct initiation of spherical detonations in gaseous explosives

1969; Elsevier BV; Volume: 12; Issue: 1 Linguagem: Inglês

10.1016/s0082-0784(69)80466-2

1878-027X

Glen G. Bach, R. Knystautas, J.H. Lee,

Energetic Materials and Combustion

This paper summarizes the salient results of a recent theoretical and experimental study of the propagation of spherical detonation waves initiated by a laser-induced spark. In this study, theoretical solutions of the blast-wave model were obtained using a novel analytical technique that yields a complete description of the spherical detonation wave from its initial overdriven state to its asymptotic C-J condition. Based on the approximation that hydrodynamic motion is not influenced by chemical reactions, solutions were also obtained for the propagation of spherical blast waves with finite kinetic rates. Three regimes of propagation were established experimentally: the subcritical energy regime, where decoupling of shock and reaction zone occurs; the supercritical energy regime, where the initially overdriven spherical detonation decays asymptotically to its C-J state; and the critical energy regime, where decoupling first occurs followed by the reestablishment of a highly asymmetrical multi-head detonation.