关键词: 激光片光源, 边条涡, 双垂尾抖振, 翼根弯矩, 翼尖加速度

Abstract: A flow visualization experiment to a Leading-Edge Extention (LEX) Configuration is conducted in the NF-3 wind tunnel at Northwestern Polytechnical University using a laser light sheet technique. The flow visualization pictures are obtained at eight longitudinal stations from Leading-Edge Extension to the trailing edge of the vertical tail by the laser light sheet. Combining with the result of the vertical tail buffet characteristic obtained from the wind tunnel experiment, the visualization experiment come to the conclusion that the bursting of the vortex shed from LEX is the primary contributor to the twin-vertical tail buffet.

Key words: laser light sheet, LEX vortex, twin-vertical tail buffet, root bending moment, tip acceleration