Integration Aspects of Lift Augmentation Systems on the Aerodynamics of a High-Lift Configuration

Kurzfassung

The scope of this report is to illustrate the installation effects of circulation control and turboprop engines on the stability characteristics of the reference aircraft’s landing configuration in lateral motion and in failure cases. Therfore, RANS simulations of the full configuration at different side slip angles and with asymmetric boundary conditions of the circulation control system and the propellers were performed. It is shown that the lateral stability of the investigated configuration is influenced by both aspects. While thrust generally leads to a reduced stability, activated circulation control tends to amplify the aircraft’s behavior. As a result, the configuration is unstable under certain conditions. The simulation of the one engine inoperative case demonstrated yawing moments up to twice as high as the actual yawing moments due to the asymmetric thrust. Furthermore, the report highlights the impact of the design update on the aerodynamic behavior in longitudinal motion, where an increase of maximum angle of attack and maximum lift could be achieved. Additional configuration enhancements were realized due to the design and integration of a nacelle strake.