EFFECT ON A SHOCK WAVE BOUNDARY LAYER INTERACTI ON OF AIR JET VORTEX GENERATORS

The eect of upstream injection by means of continuous Air Jet Vortex Generators (AJVGs) on a shock wave turbulent boundary layer inter- action is experimentally investigated. The baseline interaction is of the impinging type, with a §ow de§ection angle of 9.5 ◦ , a Mach number Me=2.3, and a momentum thickness based Reynolds number of 5,000. Considered are the eects of the AJVGs on the upstream boundary layer §ow topology and on the spatial and dynamical characteristics of the interaction. To this aim, Stereoscopic Particle Image Velocimetry has been employed, in addition to hot-wire anemometry (HWA) for the investigationofthedynamicalcharacteristicsofthere§ectedshock. Itis shown that the AJVGs signi|cantly modify the three-dimensionality of the upstream boundary layer. Overall, the AJVGs cause a reduction of the separation bubble length and height. In addition, the energetic fre- quency range of the re§ected shock is increased by approximately 50%, whichisinqualitativeagreementwiththesmallerseparationbubblesize.