Journal of Propulsion and Energy ISSN:2734-1887(Print) 2765-0049(Online)

The effects of interior ballistics(IB) with propellant configurations and arrangements have been studied to decrease maximum pressure in the barrel. In this study, several types of propellant configurations have been used. The in-house 1-D IB code with the Eulerian-Lagrangian approach has been developed for the study. The unsteady compressible IB code using SIMPLE algorithm and SMART scheme has been developed. The ghost-cell extrapolation method has been applied for the moving boundary with the projectile movement. The results showed that the 7- perforated grain type has the highest maximum pressure and the fastest muzzle velocity. However, the weak point of this is the most increased maximum pressure, which may damage the gun barrel. Among the cases with the arrangement of grain types, the combination using the propellant configurations with similar burning surface area have shown that the performance is not varied largely, however the cases using the 7-perforated grain type have revealed different results. The muzzle velocity in the region near the base has shown to be fastest, and the pressure difference between the breech and the base has appeared to be lowest when the 7- perforated grain was used in the combination of propellant types. The cases using the 7-perforated grain configuration in the region near the base are, therefore, more profitable to improve the performance and property of the interior ballistics.