BALLISTIC PERFORMANCE OF A PROJECTILE WITH A DEVELOPED BOATTAIL

Document Type : Original Article

Authors

Egyptian Armed Forces.

Abstract

ABSTRACT
A computational study using Reynolds-Averaged Navier-Stokes (RANS) equations
has been carried out to investigate air flow past projectiles provided with nonaxisymmetric
boattail at transonic and supersonic speeds. The non-axisymmetric
boattail is formed by cutting the conventional boattail with three flat surfaces having
inclination angle of ten degrees. The present study aims to discuss the effect of the
existence of these flat surfaces on the air flow characteristics compared to typical
projectile having the same base area. One of the study main concerns is the drag
and it impact on the projectile trajectory. The present study shows that the existence
of flat surfaces on the new unconventional projectile boattail is a reason of
weakening the shock wave formed on the boattail. The wake behind the
unconventional projectile base is smaller than that of the conventional model.
Moreover, the unconventional projectile has a lower pitching moment than the typical
projectile at angle of attack of three degrees.

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