A Flat Plate Wing Standing on a Wall Covered with a thick Boundary Layer. 2nd Report. Wing Characteristics under the Effects of Side Wall Boundary Layer and Wing Tip Vortex.

Abstract

The flow on a flat-plate wing with low aspect ratio suffers the effect of side wall boundary layer and also of wing tip vortex. In this study, the flow on the suction surface of the wing is observed by the oil film visualization, and the pressure distribution on the wing surface along the chord is measured in many spanwise positions. The results obtained are as follows. The side wall boundary layer induces secondary flow which suppresses the separation of the flow near the root of the wing, and the wing tip vortex suppresses flow separation near the tip of the wing. On a small aspect ratio wing, the separation of the flow is suppressed more strongly by the effects of both the side wall boundary layer and the wing tip vortex.