Simplified modeling of blast waves from metalized heterogeneous explosives

The detonation of a metalized explosive generates a complex multiphase flow field. Modeling the subsequent propagation of the blast front requires a detailed knowledge of the metal particle dynamics and reaction rate. Given the uncertainties in modeling these phenomena, a much simpler, 1D compressib...

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Bibliographic Details
Published in:Shock waves 2011-09, Vol.21 (5), p.425-438
Main Authors: Zarei, Z., Frost, D. L.
Format: Article
Language:English
Subjects:
Acoustics
Afterburning
Blasting (explosive)
Combustion products
Compressible flow
Condensed Matter Physics
Decay rate
Detonation
Energy
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Explosions
Fluid- and Aerodynamics
Gas temperature
Heat and Mass Transfer
Mathematical models
Metal particles
Modelling
Multiphase flow
Original Article
Overpressure
Parameters
Thermodynamics
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Summary:The detonation of a metalized explosive generates a complex multiphase flow field. Modeling the subsequent propagation of the blast front requires a detailed knowledge of the metal particle dynamics and reaction rate. Given the uncertainties in modeling these phenomena, a much simpler, 1D compressible flow model is used to illustrate the general effects of secondary energy release due to particle reaction on the blast front properties. If the total energy release is held constant, the blast pressure and impulse are primarily dependent on the following parameters: the proportion of secondary energy released due to afterburning, the rate of energy release, the location the secondary energy release begins, and the range over which it occurs. Releasing the total energy over a longer time period in general reduces the peak blast overpressure at a given distance. However, secondary energy release reduces the rate of decay of the shock pressure, increases the local gas temperature and hence increases the velocity of the secondary shock front. As a result, for certain values of the above parameters, the peak blast impulse may be increased by a factor of about two in a region near the charge. The largest augmentation to the near-field peak impulse results when the secondary energy is released immediately behind the shock front rather than uniformly within the combustion products.
ISSN:0938-1287
1432-2153
DOI:10.1007/s00193-011-0316-0