Abstract
Dctailed flaw visualization is done to investigate the interaction of wig-tip vortex with a flat wall. The experiment is conducted by using a half-span wing model running through a square tunnel. The flow field induced by the tip vortex is visualized and analyzed by means of PIV as well as ahigh-speed video-camera system. The results demonstrate that the vortex close to the wall is not only convected in the lateral direction due to the image vortex but also away from the wall due to the secondary vortex generated through a vortex-surface interaction. It is also shown that the generation of secondary vortex occurs when the magnitude of wall pressure gradient induced by the tip vortex exceeds a critical value.
