Computation of Vortical Flow Fields over a Close-Coupled Delta Canard-Wing Configuration and Adjoint Based Configuration Optimization

2022-2-10
Tikenoğulları, Alp
This study aims at investigating the vortical flow field over a close-coupled delta canard-wing configuration to understand the vortex interactions and the mechanism of lift enhancement provided by the canard, especially at high angles of attack, and employing an adjoint-based configuration optimization to achieve further enhancements in aerodynamic forces. An open-source CFD solver, SU2 is employed for both flow field computations and adjoint-based configuration optimizations. First, flow solutions with SU2 are verified with solution adaptive grid refinements and turbulence models. The interaction of the canard vortex with the wing vortex, its influence on the vortex breakdown and the lift generated are investigated at different angles of attack. Finally an adjoint based optimization algorithm is developed to locate the optimum position of the canard relative to wing surface. The canard translation is achieved by the rigid motion a free-form deformation box, which encloses the canard. Flow solutions show that the vortex interactions are limited at low-angle-of-attack cases but at moderate and high angle of attacks, the canard vortex enhances the total lift by eliminating the wing vortex breakdown or by pushing the breakdown location further downstream. As the result, 12% and 16% increments in lift are achieved at α=20° and α=30°, respectively. The configuration optimization performed at α=8.7° further improves the lift by 1.32%, despite the fact that at such low angles vortex interactions are limited and geometric boundaries further limits the design space. The configuration optimization at α=20°, shows that canard horizontal translation does not have an impact as much as vertical translation on lift improvement. However, closer canard-wing layout provides restoring of burst canard vortex and improves the canard lift.

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Citation Formats
A. Tikenoğulları, “Computation of Vortical Flow Fields over a Close-Coupled Delta Canard-Wing Configuration and Adjoint Based Configuration Optimization,” M.S. - Master of Science, Middle East Technical University, 2022.