INVESTIGATION AT HIGH SUBSONIC SPEEDS OF A BODY-CONTOURING METHOD FOR ALLEVIATING THE ADVERSE INTERFERENCE AT THE ROOT OF A SWEPTBACK WING
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
Pagination or Media Count:
A body-contouring method for alleviating at subsonic speeds the adverse interference at the root of a high aspect ratio sweptback wing was investigated. Several bodies used in combination with a 3 sweptback wing were modified, as proposed by Kiichemann, by shaping the body so as to counteract the distorting velocities at the wing-body junction. Although modifying the body shape did not significantly affect the aerodynamic characteristics at subcritical speeds, beneficial results were obtained at free stream Mach numbers above the critical. Improved aerodynamic characteristics were evidenced by large reduction of drag, an increase in lift-curve slope, and a reduced change of pitching-moment-curve slope with increasing Mach number. Additional tests, which involved changes in wing position relative to the body, indicated that wing position had little effect on the aerodynamic characteristics of the unmodified wing-body combinations.