Aerodynamics of Recirculating Flow Control Devices for Normal Shock/Boundary Layer Interactions

Abstract

Passive control-based methods of controlling shock/boundary layer interactions consist of a porous surface covering a cavity or a plenum located in the region of the SBLI. The present study focuses on the o weld downstream of a Mach 1.42 SBLI over various passive control devices such as a conventional porous plate, a microporous plate, streamwise slots, conventional mesoap array, and a hybrid ap array. Qualitative analysis of the various control devices investigated was achieved with spark shadowgraph visualizations and surface oil-o w visualizations. Quantitative analysis was accomplished by measuring surface static pressure distributions, boundary layer velocity pro les, and pitot pressure distributions in the subsonic di user downstream of the SBLI. The o w eld downstream of a slot-controlled and a hybrid ap array-controlled SBLI were found to be highly threedimensional, while the downstream o w elds were predominantly two-dimensional for the remainder of the control devices. It was found that only the conventional mesoap array had an improved total pressure recovery, both in the near-eld and further downstream in the subsonic diu ser, as compared to the uncontrolled, solid-wall SBLI.