Observation of the Vortex Interaction over an Yawed Delta Wing with Leading Edge Extension by Flow Visualization and 5-hole Probe Measurements

가시화와 5공 프로브 측정을 통한 연장된 앞전을 갖는 편요된 델타형 날개에서의 와류 상호작용 관찰

An experimental study is conducted to investigate the interaction of vortices over a delta wing with leading edge extension(LEX) through the off-surface flow visualization and the 5-hole probe measurements of the wing wake region. Especially, the application of a new visualization technique is employed by ultrasonic humidifier water droplet and laser beam sheet. The results, both the off-surface visualization and the 5-hole probe, show that LEX tends to stabilize the vortices of the delta wing up to the high angle of attack even though the model is yawed. With increasing yaw, the windward leading edge vortex moves inward, and closer to the wing surface, while the leeward vortex moves outwards and away from the wing surface. The vortex interaction is promoted in the windward side, and is delayed in the leeward side.