Supersonic Turbulent Flow Reattachment Downstream of a Two-Dimensional Backstep

摘要

A theoretical and experimental treatment of the reattachment of a two-dimensional, supersonic, turbulent separated flow is presented. A control volume in the reattachment region is analyzed, in order to predict the reattachment point location, pressure, and pressure gradient. Detailed experimental measurements were taken in the separated and reattaching flow regions, downstream of a two-dimensional backstep. A free stream approach Mach number of 3.05, and a free stream Reynolds number of 2.0 to 2.5 x 10 to the 7th power per foot were used. A continuous static pressure distribution was measured along the reattachment surface. The reattachment point was located by the orifice dam technique, the flush mounted pitot probe technique, and water injection-tracer techniques. The corner flow region was probed and lip shock effects on the mixing and reattachment regions were noted. Boundary layer profiles were taken throughout the rehabilitation region. The theoretical predictions and the experimental data exhibited close agreement. (Author)