Compressive combustion of granular materials induced by low-velocity impact
A reactive multiphase mixture model is used to describe the initiation and compressive combustion of granular energetic materials induced by dynamic compaction. Incorporated in this description is a two-step combustion model whereby compressive reaction is initiated by dynamic compaction. Subsequent energy release from the reaction gases evolved during compaction is delayed following an induction rate law based on time-to-reaction experimental data. Given conditions of sufficient energy release and heat transfer grain burning is initiated when granular surface temperatures exceed decomposition conditions. Model parameters are formulated for the granular explosive HMX and for nitrocellulose-based ball propellants. This model is used to simulate the low-velocity impact experiments of Sandusky and coworkers. Numerical calculations compare well with experimental observations. Details of compaction and combustion behavior are illustrated near the threshold of deflagration-to-detonation transition (DDT). 31 refs., 17 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5829642
- Report Number(s):
- SAND-89-2504C; CONF-890811-25; ON: DE89014900
- Country of Publication:
- United States
- Language:
- English
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450100* -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
CHEMICAL REACTIONS
COMBUSTION
COMPRESSION
DECOMPOSITION
GRANULAR MATERIALS
HOT SPOTS
MATERIALS
MATHEMATICAL MODELS
NITRO COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
THERMOCHEMICAL PROCESSES