Simulation of impulse effects from explosive charges containing metal particles |
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Authors: | K Balakrishnan D V Nance S Menon |
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Institution: | 1. School of Aerospace Engineering, Georgia Institute of Technology, 270 Ferst Drive, Atlanta, GA, 30332-0150, USA 2. AFRL/RWPC, 101 W. Eglin Blvd. STE 334, Eglin AFB, FL, 32542-6810, USA
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Abstract: | The propagation of an explosive blast wave containing inert metal particles is investigated numerically using a robust two-phase
methodology with appropriate models to account for real gas behavior, inter-phase interactions, and inter-particle collisions
to study the problem of interest. A new two-phase Eulerian–Lagrangian formulation is proposed that can handle the dense nature
of the flow-field. The velocity and momentum profiles of the gas and particle phases are analyzed and used to elucidate the
inter-phase momentum transfer, and its effect on the impulsive aspects of heterogeneous explosive charges. The particles are
found to pick up significant amounts of momentum and kinetic energy from the gas, and by virtue of their inertia, are observed
to sustain it for a longer time. The impulse characteristics of heterogeneous explosives are compared with a homogeneous explosive
containing the same amount of high explosive, and it is observed that the addition of solid particles augments the impulsive
loading significantly in the near-field, and to a smaller extent in the far-field. The total impulsive loading is found to
be insensitive to the particle size added to the explosive charge above a certain cut-off radius, but the individual impulse
components are found to be sensitive, and particles smaller than this cut-off size deliver about 8% higher total impulse than
the larger ones. Overall, this study provides crucial insights to understand the impulsive loading characteristics of heterogeneous
explosives. |
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