NUMERICAL SIMULATION OF A NAVAL GUN CHARGE

Abstract

Chamber cleaning projectile is one of the auxiliary projectiles equipped with a naval gun. It is an air explosion projectile without projectile. It is used to clean up the projectile retained in the chamber for special reasons or remove the residue in the chamber after launching the projectile. In this paper, based on the internal ballistic theory and one-dimensional twophase flow theory [1-3], the one-dimensional two-phase flow internal ballistic model of ordinary grenade is established, and the internal ballistic simulation calculation of the launching process of grenade is carried out. On this basis, the projectile mass is adjusted to 0, and the cleaning process of cleaning projectile is simulated. The simulation results show that when there is no projectile loading, the pressure established in the bore is very low and the propellant burns slowly. Because there is only a sealing cover at the front end, the frontend gas forward impulse speed is very fast, and the pressure in the bore decreases along the barrel, forming a large pressure gradient without negative pressure difference. The calculated negative pressure difference is 0, It shows that the internal ballistic process of launching clean chamber projectile is safe [4-5]; In addition, the calculation shows that a high-speed forward flow will be formed in the whole bore during the firing process, and the gas velocity is much higher than the initial velocity of the general projectile. This highspeed flow is conducive to removing the oil stain in the bore or the residue in the bore after the firing of the whole cartridge. The model test results provide a certain reference for the safe use of the ammunition.