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84 5 Integrated Performance of Hybrid-Electric Propulsion Systems geometry towards a double-bubble cross-section is conceivable with the lower lobe having a wider diameter. The analysis of this hybrid-electric concept enables to highlight the design space for an 𝐻𝑃 𝑢𝑠𝑒 of 50% during cruise by gaining first insights into the sizing impact and the potential benefits of hybrid-electric propulsion system at aircraft level. In view of investigating the influence of 𝐻𝑃𝑢𝑠𝑒 on the overall aircraft design and performance, a hybrid-electric clean sheet design featuring a partial parallel hybrid propulsion technology is proposed in Section 5.5. 5.4.3 Aircraft Characteristics and Benchmark The aircraft characteristics of the hybrid-electric aircraft, assuming a battery gravimetric specific energy of 1.5 khW/kg at cell-level, are compared against the advanced conventional aircraft. Both aircraft are sized a 1100 nm range and a payload are presented in the following. Aircraft main data MTOW MLW OEW/MTOW Design payload/MTOW Release fuel/MTOW Total battery/MTOW 𝑇 /𝑀 𝑇 𝑂𝑊 S.L,static 𝑀 𝑇 𝑂𝑊/𝑆𝑟𝑒𝑓 𝑆𝑟𝑒𝑓 (Airbus gross) Wing aspect ratio (Airbus gross) Wing Span Wing Leading Edge Sweep Geared Turbofan Design Thrust (ISA, FL350, M0.78) TSFC (ISA, FL350, M0.78) Electric Motor Maximal Power L/D (initial cruise, ISA, FL350, M0.78, MTOW breakes release) TOFL (ISA, SL) Approach speed (ISA, SL, MLW) for the same ATLRS. The design mission is characterized by of 18360 kg. The aircraft main data and the mass breakdown Unit [kg] [kg] [-] [-] [-] [-] [-] [kg/m2 ] [m2 ] [-] [m] [°] [kN] [g/kN/s] [kW] [-] [m] [kts] Reference Aircraft 59356 56389 0.601 0.309 0.089 NA 0.325 645 92 12.5 34.2 26.4 17.7 13.29 NA 18.04 1866 141 Hybrid Aircraft 74023 71802 0.571 0.248 0.063 0.118 0.312 645 115 12.5 38.2 26.4 21.2 13.28 5882 18.91 1915 142 𝛥 Ref. 25% 27% -5% -20% -30% NA -4% 0% 25% 0% 11% 0% 20% 0% NA 5% 3% +1% Table 5.6: Main aircraft data of the hybrid-electric aircraft sized at a design range of 1100 nm and a battery specific energy of 1.5 kWh/kg at cell-level [126]PDF Image | Conceptual Design Methods Hybrid-Electric Transport Aircraft
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