Abstract
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.
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Acknowledgments
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.
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Pontalier, Q.T., Lhoumeau, M.G., Frost, D.L. (2019). Non-ideal Blast Waves from Particle-Laden Explosives. In: Sasoh, A., Aoki, T., Katayama, M. (eds) 31st International Symposium on Shock Waves 2. ISSW 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-91017-8_5
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DOI: https://doi.org/10.1007/978-3-319-91017-8_5
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