Numerical Investigations of Aerodynamic Properties of a Propeller Blown Circulation Control System on a High Wing Aircraft

Kurzfassung

The contribution gives an overview over the wide range of CFD simulations, which were performed in the course of the German collaborative research center 880 in order to investigate the aerodynamic properties of a complete aircraft landing configuration with a circulation control high-lift system and turboprop engines. The main purpose is to highlight the integration aspects of lift augmentation technologies into the design of a short take-off and landing aircraft concept. Therefore, the influence of engine nacelles and thrust on the stall behavior and the following improvements due to the use of a nacelle strake are discussed. Furthermore, static longitudinal and lateral stability as well as the dynamic longitudinal stability are investigated. While circulation control itself has a rather small impact, the impact of engine thrust in conjunction with circulation control is considerable. Additionally, the one engine inoperative case was simulated. For some flow and engine conditions, the resulting yawing moments are more than twice as high as the actual yawing moments due to asymmetric thrust and thus are higher than expected.