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There is a loading process after the projectile of the cased telescoped ammunition (CTA) fired in the chamber, which has important influence on the stability of interior ballistics, the firing accuracy and the gun barrel life. In order to study the characteristics of velocity and attitude in the initial motion of the projectile of the CTA, a special projectile for the initial ballistic test was designed, and an initial ballistic test system based on the high-speed camera was built. The loading process after firing was observed and the loading velocity was measured. The results show that the loading speed of the projectile is about 30m/s. The initial ballistic parameters of the projectile can be studied quantitatively and the motion attitude of the projectile can be examined qualitatively by using the initial ballistic test system based on the high-speed photography.

In order to improve the muzzle velocity of the cased telescoped ammunition (CTA) with a certain caliber, a kind of charge structure with the shear form when engraving the grooves of the CTA was designed, a theoretical interior ballistic model was established and the optimization design plan was proposed. Results show that the interior ballistic model can generally describe the interior ballistic characteristics of the CTA, the calculated results agree well with the experimental ones. On the basis, by optimizing the charge structure parameters of the CTA using the multi-objective particle swarm optimization algorithm, the muzzle velocity of the projectile is improved by 2.58% with the maximum chamber pressure unchanged. The study can provide reference for the interior ballistic modeling and the charge structure of the CTA.

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