43rd JAXA Workshops on "Investigation and Control of Boundar-Layer Transition" (October 2-3, 2008) ; 44th JAXA Workshops on "Investigation and Control of Boundar-Layer Transition" (March 26-27, 2009)
抄録（英）
In order to clarify influences of trailing vortices of a forward wing on the aerodynamics of a backward wing in formation flight, behaviors and interactions of trailing vortices are examined experimentally in two-wing configuration at a Reynolds number Re = 2.5 x 10(exp 5). Both the wings have a NACA23012 airfoil section and rectangular plan-form with aspect ratio of 5. The wings are arranged in the horizontal plane with streamwise distance of 2.5 times the airfoil chord, and the forward wing is fixed at an angle of attack 8 deg. In such an arrangement, the lift to drag ratio is found to increase by 25% the two wings are overlapped with each other by 2.5-5 % of the full span, i.e., about the diameter of wing-tip vortex. Flow visualization and PIV measurements show that interactions of wing-tip vortices of both the wings occur most intensively in these conditions.
編隊飛行時の空力特性と翼端渦の干渉
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