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

Abstract

Cased telescoped ammunition (CTA) is a kind of charge structure with projectile embedded in the cartridge case. The advantages of CTA, compared with concepts using conventional ammunition, are: (1) reduced charge/ammunition volume, (2) improved performance, and (3) enhanced power and survivabillity of armament. The projectile is placed in the control tube of the cartridge before shooting. After the primer is struck, propellant product gases, generated by the igniter charge burning in the central igniter tube, drive the projectile to move forward along the control tube, and then causing the main propellants around the igniter tube and control tube to burn. Therefore, in the process of interior ballistics, there is a motion of the projectile in the control tube before the projectile engraves the rifles, in contrast with the traditional ammunition. The consistency of this motion has an important influence on the stability of CTA interior ballistic performance. The experiments on the ignition and combustion of propellants and motion of projectile in the control tube are carried out using a high-speed video recording system in this study. The projectile velocity at the entrance of the rifle is obtained from the recorded images. A two-phase flow model of CTA is also established and simulated by using the two-phase flow method and computational fluid dynamics technology. The calculated projectile velocity is in good agreement with the experimental data. The numerical results show that the developed mathematical model gives the correct trend and can provide useful calculated parameters for the structural design of CTA components.

Retracted: Interval uncertain optimization of cased telescoped ammunition interior ballistics considering tolerance design

“…With the increasingly important role of high-tech in modern warfare, the requirements for various performances of weapons in the future battlefield are also higher and higher. The high-tech war requires artillery to have a large range, be accurate, light and fast, while the drawbacks of traditional artillery design have become the bottleneck restricting the development of artillery and cannot be broken through [1][2][3][4]. At present, the way to increase the power of artillery mainly depends on increasing the caliber of artillery.…”

“…At present, the way to increase the power of artillery mainly depends on increasing the caliber of artillery. As the caliber of artillery increases, the overall size of artillery will increase, which is exactly the problem that armored weapons need to avoid [5].Cased telescoped ammunition (CTA) artillery system provides a new technical approach to solve this contradiction. The projectile of the CTA is shrunk in the cartridge case, and the propellant is filled around it.…”

Numerical simulation of the extruded process of Cased Telescoped Ammunition

“…The sealing structure and charge structure of the CTA were studied, and the extrusion process of the CTA was theoretically analyzed [3] . The zero-dimensional interior ballistic model and onedimensional two-phase flow model of the CTA were established, and the numerical simulation and optimization design were carried out [4][5][6] . The internal ballistic and charge structure of the small-caliber CTA were analyzed [7] .…”

Interior Ballistic Modeling and Charge Structure Optimization of Cased Telescoped Ammunition

“…(1) The metal shear ring connecting the projectile and the cartridge case is sheared transiently, and the projectile activation is marked by the start-up pressure. (2) The projectile slides freely in the combustible guiding tube. (3) The resistance of the bearing band engraving the grooves is described by a segmentation function.…”

“…This gun uses the CTA, the projectile of which is telescoped in a cylindrical cartridge, so that the automatic ramming system is greatly simplified. At present, lots of researches in the CTA technology have been made by the ballistic scholars from the United States, England, France, Russia and China [1,2]. The principle of the two-ignition sequential combustion is widely adopted, which works in the manner the projectile is firstly propelled into the barrel by the auxiliary propellant, and then the propellant is ignited fully.…”