Interior Ballistic Simulations of 25-mm Gun Charges
Final rept. Jun 1988-Feb 1989
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Interior ballistic simulations are performed for propelling charges based on two candidate propellants for the 25-mm cannon system mounted on the Bradley Fighting Vehicle. The two propellants are a single-base propellant and a high energy LOVA propellant HELPI. The hydrodynamics code employed in the simulations is the two-phase flow XKTC code the latest version of the NOVA code. Two areas are emphasized in this study. One is the ballistic performance comparison for each propellant using primers in three different configurations. The other is the direct comparison of ballistic characteristics between the two propellants. Results correlate well with the experimental data obtained in previous studies. It is concluded that a primer which provides more rapid flamespreading and uniform ignition along the length of the charge results in better ballistic performance. The ignition and ballistic performance of the HELP1 propelling charge, in comparison with the single-base, are found to be more sensitive to the variation of primer configuration.
- Combat Vehicles