Particle Image Velocimetry Study of Sonic Jet Injected into Supersonic Crossflow

The transverse jet injection into supersonic crossflow has additional complexities compared to the subsonic case due to the interaction of different shock structures with the oncoming boundary layer. The resulting flow field around the jet has many unsteady shock and flow features. In the current work, the mean and instantaneous flow fields around the jet are studied using Particle Image Velocimetry (PIV). The mean flow fields in the mid-plane show the jet expansion, Mach disk and shear layer between jet and crossflow besides the bow and separation shock. The effect of momentum flux ratio (J) on these flow features is studied. Instantaneous flow fields reveal the dynamics of jet, bow shock and the existence of large velocity fluctuations in the wake region.