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M.C. Schwarze, T. Zold
In the scope of this technical paper a novel aircraft configuration for a superefficient aircraft is developed within an integrated approach and conceptually be built on an existing short range aircraft. The "Inliner", a novel standard short range aircraft, is mainly characterized by a unique architecture, consisting of a set of two counter-rotating open-fans positioned in-line and thereby encircling the fuselage at a longitudinal fuselage station in front of the wings. Remarkably improved fuel efficiency of the Inliner is first achieved by a significantly increased propulsive efficiency (as a result of its special Open Fan-engine architecture), second by its improved thermodynamic efficiency (as a result of special recuperative technical measures on the two driving turboprop-engines) as well as third by its improved aerodynamic efficiency (resulting from the omission of engine pylons and nacelles, from boundary layer ingestion, from pressure recovery and from a clean wing with optional laminar flow concept). The combined measures of this integrated approach result in a significantly improved efficiency and realistic fuel savings of 40-45 % on a standard short range mission of 700 nm. At the same time with this innovative propulsion architecture according to first calculations the outward perceptible noise could be lowered by around -15 to -23 dB, meaning by - 67 to -75% regarding the outside perceived human noise intensity. The two Open Fans, however they rotate open in the fluid for best efficiency, are completely different from known open rotor configurations in terms of their aerodynamic design and their accompanied noise level. In fact with the Inliner configuration two of the most inherent challenges of former open rotor configurations - noise and rotor burst, respectively blade-off - can be solved. As fuel consumption, respectively CO2 emissions can be reduced by 40-45%, NOX levels are up to 23% lower and the outside noise level could be dropped by more than 2/3s, the Inliner is an aircraft configuration, which will tend to comply with the ambitious ACARE Vision 2020 targets.
Deutscher Luft- und Raumfahrtkongress 2014, Augsburg
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2015
21,0 x 29,7 cm, 24 Seiten
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