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Energies 2018, 11(1), 217; https://doi.org/10.3390/en11010217

Conceptual Design of Operation Strategies for Hybrid Electric Aircraft

1
Institute of Electric Power Systems, Leibniz Universität Hannover, Appelstr. 9a, 30167 Hanover, Germany
2
Aeronautics Research Centre Niedersachsen (NFL), Technische Universität Braunschweig, Hermann-Blenk-Straße 42, 38108 Braunschweig, Germany
3
Institute of Aircraft Design and Lightweight Structures, Technische Universität Braunschweig, Hermann-Blenk-Straße 35, 38108 Braunschweig, Germany
4
Institute of Jet Propulsion and Turbomachinery, TU Braunschweig, Hermann-Blenk-Straße 37, 38108 Brunswick, Germany
*
Authors to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 9 January 2018 / Accepted: 12 January 2018 / Published: 16 January 2018
(This article belongs to the Special Issue Towards a Transformation to Sustainable Aviation Systems)
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Abstract

Ambitious targets to reduce emissions caused by aviation in the light of an expected ongoing rise of the air transport demand in the future drive the research of propulsion systems with lower CO2 emissions. Regional hybrid electric aircraft (HEA) powered by conventional gas turbines and battery powered electric motors are investigated to test hybrid propulsion operation strategies. Especially the role of the battery within environmentally friendly concepts with significantly reduced carbon footprint is analyzed. Thus, a new simulation approach for HEA is introduced. The main findings underline the importance of choosing the right power-to-energy-ratio of a battery according to the flight mission. The gravimetric energy and power density of the electric storages determine the technologically feasibility of hybrid concepts. Cost competitive HEA configurations are found, but do not promise the targeted CO2 emission savings, when the well-to-wheel system is regarded with its actual costs. Sensitivity studies are used to determine external levers that favor the profitability of HEA. View Full-Text
Keywords: hybrid electric aircraft; overall aircraft design; propulsion design; battery strategy; regional aircraft; wingtip propellers hybrid electric aircraft; overall aircraft design; propulsion design; battery strategy; regional aircraft; wingtip propellers
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Hoelzen, J.; Liu, Y.; Bensmann, B.; Winnefeld, C.; Elham, A.; Friedrichs, J.; Hanke-Rauschenbach, R. Conceptual Design of Operation Strategies for Hybrid Electric Aircraft. Energies 2018, 11, 217.

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