CFD Study of Seal Groove during the Mortar Interior Ballistic Process

Abstract

To avoid gas escaping from the gap between tube and projectile in mortar, some seal grooves structures are designed. The blow-by phenomena should be considered in the simulation of interior ballistics. In order to investigate the gas leakage, computational fluid dynamic study of seal groove during the mortar interior ballistic process is presented in this paper. By the seal groove, the pressure near the outlet decreases directly. The mass flow rate of the structures without seal groove and with seal groove at the inlet are similar. However, the mass flow rate of the structure without seal groove at the outlet is obviously bigger than that of structures with different seal grooves. The results show that the seal groove such as trapezoid seal groove can decrease the gas leakage and improve the interior ballistic performance. The further study on structure optimization will be a reference for the mortar design.