Modeling thermal-mechanical processes associated with the initiation and combustion of granular energetic materials
In this paper, we describe a reactive multiphase flow model for the initiation and compressive combustion of dynamically compacted granular energetic materials. Numerical solutions of the reactive multiphase flow equations are obtained for various cases of dynamic compaction. Constitutive relationships of this description are determined for the granular explosive HMX and for nitrocellulose- based ball propellants. At low impact velocities, loading produces compaction without subsequent reaction. Calculations of compaction wave speed and compaction density are in good agreement with experimental observations. Compaction-induced combustion is observed for conditions of higher impact loading. A global reaction model is formulated using experimental time-to-reaction data and calculations of the initiation and combustion reveal detailed wave structures of the compaction and flame spread near the threshold to deflagration to detonation transition (DDT). Predictions of the reactive one-dimensional wave fields compare favorably to experimental observations. 17 refs., 10 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6219245
- Report Number(s):
- SAND-88-1296C; CONF-890661-5; ON: DE89007145
- Country of Publication:
- United States
- Language:
- English
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CHEMICAL EXPLOSIVES
CHEMICAL REACTIONS
COMBUSTION
DETONATIONS
EXPLOSIVES
FLOW MODELS
FLUID FLOW
MATERIALS
MATHEMATICAL MODELS
MULTIPHASE FLOW
OXIDATION
PHYSICAL PROPERTIES
POROUS MATERIALS
PROPELLANTS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES