Non-ideal Blast Waves from Particle-Laden Explosives
When an explosive charge is surrounded by an inert granular material, the resulting blast overpressure is attenuated due to the transfer of the chemical energy released to the kinetic energy of the material and energy dissipation during compaction of the porous particle bed. In the present paper, the effect of various parameters on the blast wave attenuation and profile during explosive particle dispersal is explored with a multiphase hydrocode. The results indicate that as the particles are accelerated, the blast overpressure falls below the blast pressure for a homogeneous charge of the same mass in the near field but then recovers at a scaled distance of about 5 as the particles decelerate. Although the peak overpressure is reduced in the near field, the overall loading on a nearby structure may actually be increased when the interaction of the flow and particles with the structure are taken into account.
The authors acknowledge the helpful discussions and the assistance with the use of the EDEN hydrocode from A. Milne and A. Longbottom of Fluid Gravity Engineering Ltd.
- 3.B.E. Gel’fand, Blast waves attenuation in two-phase media, in Symposium on Interdisciplinary Shock Wave Research, Sendai, Japan, 2004, pp. 150–166Google Scholar
- 4.A. Britan, H. Shapiro, G. Ben-Dor, Foams for Blast Mitigation (Foam Engineering: Fundamentals, John Wiley & Sons, 2012), Ch. 19, pp. 477–512Google Scholar
- 5.V.F. Nesterenko, Shock (blast) mitigation by soft condensed matter. MRS Symp. Proc. 759, MM4.3.1–MM4.3.12 (2003)Google Scholar
- 6.B. Langhorst et al., Material systems for blast-energy dissipation, in Proceedings of the IMPLAST 2010 Conference, Providence, Rhode Island, USA, 2010, pp. 1–8Google Scholar
- 7.Q. Pontalier et al., Blast mitigation by granular materials and liquids in spherical geometry, in 24th International Symposium on Military Aspects of Blast and Shock, MABS, Halifax, Canada, 2016, pp. 1–19Google Scholar
- 10.G.F. Kinney, K.J. Graham, Explosive Shocks in Air (2nd edition), (Springer, Berlin1985)Google Scholar