Abstract
The Collaborative Research Center 880 is investigating different technologies and configurative variants for the purpose of short take-off and landing (STOL) capabilities, ranging from high-lift systems with Coandӑ flaps to unusual but potentially more efficient engine arrangements. The present study focuses on the reference configuration 3 (REF3). This configuration is characterized by an UHBR over-the-wing nacelle (OWN) located above the wing trailing edge. Starting from the wing/body configuration the installation effects of the OWN were investigated. A fully automatized surrogate based optimization was used to evaluate the impact of an engine position variation in vertical and horizontal direction to observe fundamental aerodynamic interactions between wing and OWN in cruise flight conditions. Due to the presence of OWN and pylon, a distinct disturbance on the wing upper surface could be observed leading to significant interference effects. Nevertheless, the overall cruise drag of REF3 could be improved by 37 drag counts or nearly 11% due to the position optimization.
Highlights
A number of ambitious goals of the European aeronautical industry and research organizations were defined by the Flightpath 2050 vision [1] in 2011
The topics addressed in the Collaborative Research Center (CRC) 880 range from the investigation of porous materials for noise reduction, for example along the wing’s trailing edge [5], to full aircraft design studies considering the potential benefits of an engine installation above the wing
The optimization was initialized with ten samples for the Design of experiments (DoE), to conform a minimum guide number of five samples per parameter
Summary
A number of ambitious goals of the European aeronautical industry and research organizations were defined by the Flightpath 2050 vision [1] in 2011. To address some of the future challenges, a collaboration between the Technical University of Braunschweig, the Leibnitz University of Hannover and the German Aerospace Center (DLR) has been established to form the Collaborative Research Center (CRC) 880 It focuses on multi-disciplinary investigations of innovative technologies by involving different disciplines from aerodynamics over composites to materials including an overall aircraft level assessment. The topics addressed in the CRC 880 range from the investigation of porous materials for noise reduction, for example along the wing’s trailing edge [5], to full aircraft design studies considering the potential benefits of an engine installation above the wing. A beneficial aerodynamic effect due to the interference between wing suction side and engine inlet can be expected This was observed by Hooker et al [7] during an extensive study of different engine positions on commercial aircraft tube and wing configurations. A surrogate-based optimization with the objective of improving the overall drag coefficient by adapting the engine position will be presented
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