Abstract
In the framework of the Cranked-Arrow Wing Aerodynamics Project International 2, Netherlands National Aerospace Laboratory performed an analysis of a set of transonic flight conditions available in the Cranked-Arrow Project database. Flight condition FC70 was used previously during the Cranked-Arrow Wing Aerodynamics Project International to investigate transonic flow on the F-16XL aircraft. During this project, it was discovered that flight condition FC70 was flown with a deflected leading-edge flap. To facilitate computational fluid analysis, a transonic flight condition without deflected control surfaces was judged desirable by the Cranked-Arrow Project members. Therefore, it was decided to search the Cranked-Arrow Project database for a transonic flight condition without any control surface deflections. Because no information on the control surface deflections of the other transonic flight conditions was available to the Cranked-Arrow Project partners, an alternative approach to scrutinize the available flight-test sectional surface pressure measurements for indications of control surface deflections was adopted. This analysis revealed that flight condition FC79 was the most likely transonic flight condition to be flown without any control surface deflections. Flight conditions FC70 and FC79 were analyzed using National Aerospace Laboratory’s in-house-developed flow simulation system ENFLOW. Comparison of the measured and simulated surface pressure coefficients confirmed that flight condition FC79 was flown without any control surface deflections, and that this flight condition is thus much better suited for further comparisons between flight-test data and computational fluid dynamics simulations.
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