USE OF FENCES TO INCREASE UNIFORMITY OF BOUNDARY LAYER ON SIDE WALLS OF SUPERSONIC WIND TUNNELS

摘要

An investigation of the use of solid fences installed on the side walls of a supersonic wind tunnel to retard the development of trans¬verse flow and thus to increase the uniformity of the side-wall bound¬ary layer is reported. Beneficial results were obtained with fences which had depths of the order of the boundary-layer displacement thick¬ness and which followed potential-flow streamlines through the nozzle. Reduction of the number of fences on each side wall from four to two eliminated their effectiveness.