23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-3.10.2

THE EFFECT OF WING TIP BLOWING ON THE VORTEX DRAG

R. F. M. Coimbra, F. M. Catalano
University of Sao Paulo, Brazil

Keywords: wing tip blowing, induced drag, coanda jet

Experimental work has been conducted to evaluate the effect of wing tip blowing on the vortex drag of a rectangular low aspect wing at low speed. A novel tip blowing system is presented which consist of three Coanda type jets. The jets can be vectored to produce a better tip vortex attenuation. Wind tunnel tests were performed for measurements of Lift, Drag and Pitching moment for a large number of combinations of jet vertical angles and position. The tests were conducted at constant Reynolds number for incidence angles from -4 to 22 degrees. Results indicated an increase in Lift and pitching moment with an inherent decrease in drag for most of the configuration tested.

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