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 Journal of the Korea Institute of Military Science and Technology 2002;5(3):77-86.
 Vortex Interaction Characteristics of a Delta Wing/LEX , 12 삼각날개/LEX에서의 와류 상호작용 특성 이기영, 손명환 1공군사관학교 기계공학과2공군사관학교 항공우주공학과 Abstract An experimental study of the vortex interaction characteristics of a delta wing/LEX configuration was conducted in a wind tunnel using the micro water droplet and laser beam sheet visualization technique. The main focus of this study was to analyze the effect of the angle of attack and sideslip angle on the vortex interaction and vortex breakdown. These tests were accomplished at angles of attack between $16^{circ}$ and $28^{circ}$ and sideslip angle between $0^{circ}$ and $-15^{circ}$ at free-stream velocity of 6.2 m/s. Flow visualization data provide a description of the vortex interaction between LEX and wing vortices, and of the vortex breakdown. The introduction of LEX vortex stabilized the vortical flow, and delayed the vortex breakdown up to higher angle of attack. The vortex interaction and breakdown was promoted on the windward side, whereas they are suppressed on the leeward side. Key Words: Delta Wing, LEX(Leading Edge Extension), Vortex Interaction, Vortex Breakdown, Sideslip Angle