CONFINED NORMAL-SHOCK TURBULENT-BOUNDARY-LAYER INTERACTION FOLLOWED BY AN ADVERSE PRESSURE-GRADIENT

A steady, nominally two-dimensional interaction of a normal shock with a turbulent boundary layer over a flat surface is investigated experimentally. The approach Mach number is 1.34 and the Reynolds number based on the momentum thickness of the approach boundary layer is 14,600. The boundary layer displays intermittent flow reversal (incipient detachment) at the foot of the shock. The experiment differs from similar past studies by the imposition of an extended adverse pressure gradient region downstream of the shock and by a relatively high ratio of approach boundary-layer thickness to channel height. The time-mean and fluctuating velocity fields were explored in detail using laser Doppler velocimetry. Spatial distributions of turbulence kinetic energy, shear stress, and turbulence production are presented.