Numerical Investigation of the Dynamic Behavior of a High Lift Configuration with Circulation Control

The scope of this paper is to demonstrate the feasibility of a numerical evaluation of dynamic derivatives of a 3D high-lift configuration. Furthermore, the influence of active lift augmentation systems on the longitudinal dynamic derivatives shall be illustrated. Therefore, forced pitching and plunging motions at different boundary conditions were simulated. The investigation started with a comprehensive sensitivity study regarding algorithmic and configurational parameters on a representative 2D-model. The results show the impact of frequency, amplitude, flap deflection and blowing coefficient. Based on the preliminary 2D study, boundary conditions were selected for the simulation of the entire aircraft in landing configuration. The dynamic derivatives were successfully evaluated based on the linearization method. Neither thrust, nor blowing showed significant impact on the longitudinal dynamic derivatives