Velocity measurements in a shock-separated free shear layer

two-component laser Doppler velocimetry measurements were made in a planar, shock-separated free shear layer formed by the convergence of two superson ic streams past a thick plate. High-speed wall-pressure measurements were u sed to locate the unsteady shock wave formed by this interaction and, conse quently, facilitated separation of the effects of shock motion from the tur bulent fluctuations in the velocity measurements of the shear layer. Shock- induced flow separation dramatically increases the turbulent normal and she ar stresses. The shock-separated shear layer displays a positive shear stre ss region between separation and reattachment. Reattachment produces a shif t in turbulent kinetic energy from the streamwise component to the transver se component. The region of shock motion has a relatively constant width, i rrespective of distance from the wall.