Modeling Enhanced Blast Explosives Using
A Multiphase Mixture Approach
Author(s)
M. R. Baer, R. G. Schmitt, E. S. Hertel & P. E. DesJardin
Abstract
In this overview we present a reactive multiphase flow model to describe the physical
processes associated with enhanced blast. This model is incorporated into
CTH, a shock physics code, using a variant of the Baer and Nunziato nonequilibrium
multiphase mixture to describe shock-driven reactive flow including the
effects of interphase mass exchange, particulate drag, heat transfer and secondary
combustion of multiphase mixtures. This approach is applied to address the various
aspects of the reactive behavior of enhanced blast including detonation and the
subsequent expansion of reactive products. The latter stage of reactive explosion
involves shock-driven multiphase flow that produces instabilities which are the
prelude to the generation of turbulence and subsequent mixing of surrounding air
to cause secondary combustion. Turbulent flow is modeled in the context of Large
Eddy Simulation (LES) with the formalism of multiphase PDF theory including a
mechanistic model of metal combustion.
Keywords: shock physics, blast waves, two-phase flow, combustion.
1 Introduction
Enhanced blast explosives (EBX) consist of energetic materials that are capable of
producing high temperatures and high pressures over extended periods of time to
greatly enhance the impulse and thermal output delivered by a blast.Whereas conventional
high explosives produce extremely high pressures due to the full energy
release at a shock front, the high pressure persists for only a short time. Enhanced
blast explosives, on the other hand, produce lower pressures in the near field but
sustain higher pressures and temperatures at a greater range over a longer duration
Keywords
shock physics, blast waves, two-phase flow, combustion.
Related Book
Other papers in this volume
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