Airloads on Bluff Bodies, with Application to the Rotor-Induced Downloads on Tilt-Rotor Aircraft.
NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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The aerodynamic characteristics of airfoils with several flap configurations have been studied theoretically and experimentally in an environment that simulates a wing immersed in the downwash of a hovering rotor. Special techniques have been developed for correcting and validating the wind-tunnel data for large blockage effects, and the test results have been used to evaluate two modern computational aerodynamics codes. The combined computed and measured results show that improved flap and leading-edge configurations can be designed which will achieve large reductions in the downloads of tilt-rotor aircraft, and thereby improve their hover efficiency. Author