STUDY ON INFLUENCE OF MATCHING BETWEEN COMBUSTIBLE CARTRIDGE CASE AND GUN PROPELLANT BURNING RATE ON INTERNAL BALLISTIC PERFORMANCE

The matching between the combustible cartridge case (CCC) and gun propellant burning rate plays an important role in interior ballistic performance of charge since there is a large difference between their burning rate coefficients. This paper investigated the burning process and determined the burning rate coefficients of CCC and gun propellants using closed bomb test. The characteristic parameter, such as composition, thickness, and porosity of the CCC significantly affected the burning rate coefficient. The relationship between the burning rate coefficient of the CCC, maximum chamber pressure and muzzle velocity of 105mm tank gun propellant charge can be calculated through interior ballistic code. For a certain gun propellant, the expected interior ballistic performance can be obtained through a good match between the CCC and gun propellant burning rate coefficient. Compared to CCC with higher burning rate coefficient, the coefficient in the range of 5 to 6 mm·MPa⁻¹·s⁻¹ of CCC exhibits better matching property with 14/19 TEGDN gun propellants in 105mm gun firing and its suitable characteristic parameters are determined by an established model further. This study demonstrated the significance and strategy of match between CCC and gun propellant burning rate coefficient.