A Study on the Wake behind Normal Plates in a Turbulent Boundary Layer

The present paper describes the mean-flow patterns, distributions of the mean velocity and turbulence intensity in the wake behind the normal plates immersed in a smooth-wall turbulent boundary layer with zero-pressure gradient. The effect of a parameter h/δon the mean-flow patterns and distributions of the mean velocity in the wake is examined in some detail, where h and δ are respectively the height of the normal plate and the boundary layer thickness. The main results will be summarized as follows : (a) The geometrical shape of the rear standing eddy and the reattachment point of the separated flow are not very much influenced by the parameter h/δ. (b) The mean velocity profiles in the rear separation eddy are closely approximated by the velocity profile in a constant pressure half-jet theoretically obtained by Goertler. (c) A maximum turbulence intensity in the wake behind the normal plate occurs along the flow separated from the top edge of the plate