Abstract
*† ‡ Particle Image Velocimetry is applied to the interaction between an incident shock wave and a flat plate turbulent boundary layer at Mach 2.1. The undisturbed boundary layer is characterized by its mean and turbulence properties. The interaction region is characterized by the mean velocity field, which shows the incident and reflected shock wave pattern, as well as the boundary layer distortion. The unsteady flow properties are inspected by means of instantaneous velocity fields. Patches of reversed-flow are frequently observed at several locations. Although significant reversed-flow is measured instantaneously, on average no reversed-flow is observed. Turbulence properties show the highest turbulence intensity in the region behind the impingement of the incident shock wave. Turbulence anisotropy is found to be present, with the streamwise component dominating. A distinct streamwiseoriented region of relatively large Reynolds shear stress magnitude appears in the redeveloping boundary layer and persists downstream. The recovery of the boundary layer towards its initial equilibrium conditions therefore appears to be a gradual process.
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