Electric, hybrid, and turboelectric fixed-wing aircraft

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Electric, hybrid, and turboelectric fixed-wing aircraft ( electric-hybrid-and-turboelectric-fixed-wing-aircraft )

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though non-technical, summary of aviation electrification from a business perspective. Hepperle [8] presents an overview of EP architectures and some basic sensitivity analy- ses based on the Breguet range equation. Pornet [9] covers practical conceptual design considerations of hybrid electric passenger aircraft using lower-order sizing methods and graphical methods, but is missing coverage of higher-fidelity optimization tools and a comprehensive survey of design studies and demonstrator programs. A U.S. National Academy of Engineering (NAE) subcommittee published a study report eval- uating underlying EP technologies and making recommendations on high-level research priorities [10]. Several other reviews cover aircraft EP as a sidebar to another primary topic. Gohardani et al. [11] review distributed propulsion with an extended discussion of EP; Gohardani [12] later updated and expanded the review. Sarlioglu and Mor- ris [13] present an excellent review of more-electric aircraft systems that includes a sidebar on propulsion. Perullo and Mavris [14] focus only on higher-fidelity modeling of energy management in hybrid configurations; Wall and Meyer [15] likewise focus only on hybrid electric. In spite of all the work cited above, there is a need for a review article that provides an entry point to the field of EP for aircraft designers, modelers, and technologists, who are versed in aircraft design principles but do not necessarily have an electrical background. We address this need by providing an up-to-date review that covers EP fundamentals, concepts and demonstrators, technologies, practical design trades, and simulation capabilities. 2 Aircraft Electric Propulsion Fundamentals 2.1 Classification Aircraft can be categorized based on the degree of hybridization of their power and energy sources. A definition of hybridization with respect to power and energy was developed by Isikveren et al. [16], namely: HP = Pm (1) Ptot HE = Eb (2) Etot By convention, hybridization is usually given with respect to electric motor power and battery energy (Pm and Eb), though in principle the same method of analysis could be used for other sources, such as hydrogen. Conventional aircraft use no electric power or electric energy for propulsion (HP = 0, HE = 0). On the other end of the spectrum, all-electric aircraft (Figure 2a) use exclusively electrical energy and power for propulsion (HP = 1, HE = 1). Some authors prefer the term universally-electric. Hybrid electric aircraft rely on a mix of fuel and electrical energy storage and propulsive power (HP > 0, 0 < HE < 1). Finally, turboelectric aircraft (Figure 2b) use combustable fuel for energy storage but electrical power transmission instead of mechanical power to drive the propulsor(s) (HP > 0, HE = 0). 4

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