MEASUREMENTS OF A SEPARATED AND REATTACHED TURBULENT BOUNDARY LAYER

摘要

Digital Particle Image Velocity (DPIV) has been used to obtain velocity and vorticity information of a closed separation bubble in a turbulent boundary layer on a flat plate. Separation and reat-tachment were instigated by imposing an adverse and favourable pressure gradient, respectively, on a turbulent boundary layer. Preliminary observations and measurements indicate a highly unsteady flow with large changes to the shape and size of the separation bubble.