Study of Ballistic Parameters for Projectile Range Extension

Resumo

The external ballistics of an artillery shell requires an understanding of aerodynamics in compressible
flow. In this context, computational fluid dynamics (CFD) techniques are used because real tests with ammunitions
are more expensive than numerical simulations. The purpose of this study is to simulate the use of downstream hot
mass flow injection, which is technically called base bleed, because it increases base pressure to an optimal value
that reduces base drag, which is the main component of the total aerodynamic drag. The compressible, stationary
and two-dimensional axisymmetric flow around the projectile is simulated and analyzed. For the simulations,
the SST k-ω turbulence model is used, based on the Reynolds means (RANS). The results are compared with a
specific commercial program for application in weapons ballistics. The main results are the velocity, pressure and
temperature fields; in addition to obtaining drag coefficients for different situations of boundary conditions.