NUMERICAL INVESTIGATION OF LATERAL JET INTERACTION ON A FIN-STABILIZED PROJECTILE

The effects of a lateral reaction jet on the forces and moments imparted to a basic finstabilized projectile in Mach 1.5 and 2.5 free stream flows was investigated using computational fluid dynamics simulations. A 340 pressure ratio jet was investigated at seven axial locations along the top surface of the projectile. The flow field showed the typical jet bow shock, main and horseshoe vortices emanating from the jet, barrel shock, and Mach disk. At both Mach numbers, the jet thrust was attenuated at the forward five jet locations-about 25-75% at Mach 1.5 and 15-45% at Mach 2.5. The jet thrust was amplified up to 80% when located close to the tail fins.