Jet Breakup and Combustion Modeling for the Regenerative Liquid Propellant Gun
Final rept. Feb-Dec 1989
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
Pagination or Media Count:
Although interior ballistic models for the regenerative liquid propellant gun have been shown to be capable of accurately describing the mechanical response of the system, descriptions of the breakup and combustion of the liquid jet have proven less satisfactory. The propellant has been assumed to break into droplets whose diameters are functions of piston position or chamber pressure, and then combust according to a pressure-dependent burn rate law. This empirical description of the jet breakup has been shown to provide accurate gun simulations and to be reasonably predictive in terms of maximum pressure and muzzle velocity within guns of the same caliber. However, it has previously not been possible to identify a unifying set of parameters which describes breakup and combustion among calibers. This report explores the adaptability of models of jet breakup discussed in the literature to the regenerative liquid propellant gun environment. A particular model is chosen and implemented in the lumped parameter gun code. With a single value of the one adjustable parameter, the model accurately simulates experimental data from all three Concept VIC gun calibers. An alternate approach is also derived that does not involve droplets. Agreement between the new mathematical models is excellent.
- Ammunition and Explosives
- Combustion and Ignition