Particle momentum effects from the detonation of heterogeneous explosives


  1. Frost, D.L.
  2. Tanguay, V.
  3. Zhang, F.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);McGill Univ, Montreal QUE (CAN) Dept of Mechanical Engineering;Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
Detonation of a spherical high explosive charge containing solid particles generates a high-speed two-phase flow comprised of a decaying spherical air blast wave together with a rapidly expanding cloud of particles. The particle momentum effects associated with this two-phase flow have been investigated experimentally and numerically for a heterogeneous explosive consisting of a packed bed of inert particles saturated with a liquid explosive. Experimentally, the dispersion of the particles was tracked using flash radiography and high-speed photography. A particle streak gauge was developed to measure the rate of arrival of the particles at various locations. Using a cantilever gauge and a free-piston impulse gauge, it was found that the particle momentum flux provided the primary contribution of the multiphase flow to the near-field impulse applied to a nearby small structure. The qualitative features of the interaction between a particle and the flow field are illustrated using simple models for the particle motion and blast wave dynamics. A more realistic Eulerian two-fluid model for the gas-particle flow and a finite-element model for the structural response of the cantilever gauge are then used to determine the relative contributions of the gas and particles to the loading.
Report Number
DRDC-SUFFIELD-SL-2007-061 — Scientific Literature
Date of publication
13 Jun 2007
Number of Pages
Reprinted from
Journal of Applied Physics, no. 101, 2007
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