Experimental Study and Numerical Simulation of Propellant Ignition and Combustion for Cased Telescoped Ammunition in Chamber

摘要

Cased telescoped ammunition (CTA) is a kind of charge structure with projectile embed-nded in the cartridge case. The advantages of CTA, compared with concepts using con-nventional ammunition, are: (1) reduced charge/ammunition volume, (2) improved perfor-nmance, and (3) enhanced power and survivabillity of armament. The projectile is placednin the control tube of the cartridge before shooting. After the primer is struck, propellantnproduct gases, generated by the igniter charge burning in the central igniter tube, driventhe projectile to move forward along the control tube, and then causing the main propel-nlants around the igniter tube and control tube to burn. Therefore, in the process ofninterior ballistics, there is a motion of the projectile in the control tube before the pro-njectile engraves the rifles, in contrast with the traditional ammunition. The consistency ofnthis motion has an important influence on the stability of CTA interior ballistic perfor-nmance. The experiments on the ignition and combustion of propellants and motion ofnprojectile in the control tube are carried out using a high-speed video recording system innthis study. The projectile velocity at the entrance of the rifle is obtained from the recordednimages. A two-phase flow model of CTA is also established and simulated by using thentwo-phase flow method and computational fluid dynamics technology. The calculatednprojectile velocity is in good agreement with the experimental data. The numerical resultsnshow that the developed mathematical model gives the correct trend and can providenuseful calculated parameters for the structural design of CTA components.nu0001DOI: 10.1115/1.4001560u0002nfense Industrial Association, USA.