Experimental Study on Configuration Effects of Supersonic Projectiles in Transitional Ballistic Regimes
The flow field associated with a moving projectile in the transitional ballistic regime is highly complicated and unsteady. The projectile interactions with the surrounding flow field affect the aerodynamic force acting on the projectile and have great impact on its stability, control, and dispersion characteristics. There are interesting fluid dynamic phenomena in this regime where the projectile interacts with the unsteady jet. One of the profound interactions is a situation in which the projectile overtakes the primary blast wave in the vicinity of the gun muzzle itself where the blast wave is very strong. In the present study, experiments are conducted with projectiles of cylindrical, conical, and hemispherical shapes, in order to understand the characteristics of projectile-flow field interactions and the projectile overtaking phenomenon, in particular. Flow field is captured using time-resolved schlieren flow visualization technique. The behavior of different shaped projectiles in the transitional ballistic regime is analyzed to understand the configuration effects. The various overtaking regimes are also identified by constructing the x-t diagram from the trajectory information obtained by image processing.
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