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A. Frühbeis, I. Held, P. Sieb, A. Usbek
The eRay conceptual design meets the future demand for ultra efficient aircraft. A qualitative study examines various basic concepts and defines the framework of a turbo-electric distributed propulsion (TEDP) aircraft with Laminar-Flow Control for improved aerodynamics and CFRP structures for decreased mass. The TEDP layout is further specified to consist of electric fans distributed along the wing and around the aft fuselage. The electric engines are powered by a turbine and a generator placed on each wing tip and a battery for buffering. A parametric model links aerodynamics, mass estimation and propulsion creating a simulated model of the reference airplane and the investigated concept. Iterating over several input parameters led to a conservative and a more optimistic concept to consider uncertainties regarding technical and social developments until 2045. The technical concepts differ through qualitative input parameters like battery energy density and through bolder design features like the lack of a vertical stabilizer. The optimistic version leads to the promoted concept eRay, showing mass reductions of 30%, (L/D) improvement of 24% and propulsive efficiency improvements of 50% compared to 2005s state-of-the art reference aircraft leading to an overall improvement in energy consumption of 64% compared to the Airbus A321. The "Baseline Concept" is 47% more efficient regarding energy consumption than the selected reference airplane. Ground handling of the aircraft requires certain minor adjustments in airport technical infrastructure. However, the concept of operations and considerations regarding cabin layout and the technical and financial feasibility show the competitiveness of the eRay in an airlines daily routine, proofing that the eRay meets the demands specified in the beginning.
Deutscher Luft- und Raumfahrtkongress 2018, Friedrichshafen
Verlag, Ort:
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2019
Conference Paper
21,0 x 29,7 cm, 14 Seiten
Stichworte zum Inhalt:
NASA/DLR Design Challenge, eRay
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Frühbeis, A.; Held, I.; et al. (2019): The eRay Aircraft Concept. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/480345. urn:nbn:de:101:1-2019020809502892975776.
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