Flat Plate Wing Standing on a Wall Covered with a Thick Boundary Layer. 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 is affected by the side wall boundary layer and also the wing tip vortex. In this study, the flow on the suction surface of the wing is observed by means of the oil-film flow-visualization method, and the pressure distribution on the wing surface along the chord is measured at 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 wing having a small aspect ratio, the separation of flow is suppressed more strongly by the effects of both the side wall boundary layer and the wing tip vortex.