Three-Dimensional Flowfield in a Fin-Generated Shock Wave/Boundary-Layer Interaction Using Tomographic PIV

Abstract

Three-dimensional flowfield measurements within a separated swept shock wave/boundary-layer interaction are acquired using a four-camera tomographic particle image velocimetry system in the present study. The turbulent, Mach 2 incoming flow has a unit Reynolds number of , and the shock interaction is produced by a sharp, unswept fin with a deflection angle of 15 deg from the freestream flow. Three volumes are examined to focus on different regions of the flow: 1) conically developed flow away from the wall spanning almost the entire interaction, 2) near the fin surface, a region that remains relatively unexplored, and 3) parallel to the floor in the near-wall region of the interaction. The flowfield is investigated in depth by visualizing velocity isosurfaces, with special emphasis on the growth of the interaction as one moves away from the interaction origin, which is a unique feature of swept interactions with strong crossflow. Initial results of the flowfield response to microjet actuation at four separate locations within the interaction are also discussed. The effect of introducing disturbances using upstream actuators is found to be the most prominent in the region near flow separation, where the streamlines are modified and overall separation size is reduced.