Author(s)

H. Miura & A. Matsuo

Abstract

A two-dimensional axisymmetric simulation in the interior ballistic system was carried out using a two-phase CFD code by an Eulerian/Eulerian approach. The interior ballistics predict the phenomena in gun firings by means of the simulation of solid propellant combustion and gas generation. The inviscid equations for mass, momentum and energy of the gas phase and equations of the solid phase contain the terms for interphase properties such as mass of gas generated by solid decomposition, drag between gas and solid phases, and combustion heat. The calculation is started with the igniting of solid propellants, and the end of the calculation is the time when a projectile reaches the gun muzzle. For solid propellants charged in a gun chamber, smokeless gunpowder was used. The simulated pressure profiles in the chamber and the muzzle velocity of the projectile quantitatively agree with the experimental data. The simulation of the gun chamber shows the chain of igniting solid propellants, the propagation of the pressure wave and the movement of the solid phase. Keywords: interior ballistics CFD, solid propellant, two-phase flow. 1 Introduction Gun system, which is one of propulsion unit, has remarkable capacity to accelerate projectile by supersonic velocity instantaneously. In gun systems, a projectile is propelled by pressurization of the chamber caused by combustion of solid propellant. For this analysis, the interior ballistics has been used. The interior ballistics predicts the phenomena in gun firings by means of simulations of solid propellant combustion and gas generation [1]. The calculation is started with igniting solid propellants, and the end of calculation is the time when a projectile reaches the gun muzzle. These phenomena in gun systems are should

Keywords

interior ballistics CFD, solid propellant, two-phase flow.