Conceptual Design Methods Hybrid-Electric Transport Aircraft

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Conceptual Design Methods Hybrid-Electric Transport Aircraft ( conceptual-design-methods-hybrid-electric-transport-aircraft )

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6 2 Hybrid-Electric Technology State-of-the-Art and Beyond Figure 2.1: Conventional, hybrid and universally-electric propulsion system topology [14]. Ad- apted from [16] . provided by unducted or ducted-propulsors. For a conventional fuel-based propulsion system, a reciprocating engine or a gas-turbine are typically considered. The shaft power is created by converting chemical energy resulting from the combustion of the fuel into mechanical power through an aero-thermodynamic process. In an electrical propulsion system, shaft power is produced through a process that can be subdivided into the generation, the distribution and the conversion of electrical energy into mechanical power as represented in Figure 2.1. For the electrical energy generation, the following devices or their possible combinations are most commonly considered to provide the electrical power: • an electrochemical battery which converts stored chemical energy into electric energy as detailed in Section 2.2.3.1, • a fuel cell generating electrical power through chemical reaction facilitated by a fuel (such as liquid hydrogen) and oxygen as developed in Section 2.2.3.2, • a generator, driven by a conventional fuel powered combustion engine, which converts mechanical power into electric power. This arrangement is commonly known under the terminology of turboelectric (see Section 2.1.1). Even if not explicitly shown in Figure 2.1, supercapacitors or flywheels could be also con- sidered to provide electrical power [17].

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