Shock interaction with solid particles in condensed matter and related momentum transfer

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Authors
  1. Zhang, F.
  2. Thibault, P.A.
  3. Link, R.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Timescales-Scientific Ltd, Bedford NS;Combustion Dynamics Ltd, Halifax NS (CAN)
Abstract
Detonation propagation in a condensed explosive with metal particles can result in significant momentum transfer between the explosive and the particles during their crossing of the leading shock front. Consequently, the assumption of a 'phase-interaction- frozen shock' used in multi phase continuum models for detonation initiation and propagation may not be valid. This paper addresses this issue by performing numerical and theoretical calculations in liquid explosives and RDX with various compressible metal particles under conditions of detonation pressure. The results show that the momentum transferred to heavy-metal particles such as tungsten is not significant after the shock-particle interaction. However, light-metal particles including aluminium, beryllium and magnesium rapidly accelerate during the shock-particle interaction. They reach a considerable speed immediately behind the shock front, typically 60-100% of the flow speed of the explosive. It is important to take this significant momentum transfer at the shock front into account when modelling the shock initiation and detonation structure for two-phase mixtures of condensed explosive and light-metal particles.
Report Number
DRDC-SUFFIELD-SL-2002-183 — Scientific Literature
Date of publication
20 Jan 2003
Number of Pages
22
Reprinted from
Proc. R. Soc. Lond A, vol 459, 2003, p 705-726
DSTKIM No
CA033934
CANDIS No
533322
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