CFD computations of steady and non-reactive flow around fin-guided ram projectiles

摘要

The numerical simulation of the flow around the body has been conducted with hte Navier-Stokes code TASCflow, used in a non-reactive, steady and three-dimensional version. The aim of this computational work is to contribute to the projectile shape optimization under pure aerodynamical conditions, and therefore, to localize shock waves and their interactions, recirculation zone and high-temperature areas. Results presented in this paper show the effects of the fins on the flow configuration around the body and at the base (recirculation zone). Parameters such as the profile of leading edges and the number and size of fins are taken into account to compare the different flow fields. The results of computation, related to experiments performed in inert gas with differnet projectiles, have been used to highlight the influence of these parameters on the efficiency of thediffuser formed by the projectile afterbody. The pressure and temperature in the flow around the projectile when entering the ram tube and just before the initiation of the combustion are given. The present work demosntrates that the computer ode TASCflow can provide a valuable tool for the optimization of the projectile geometry.