A refined sizing method of fuel cell-battery hybrid system for eVTOL aircraft

Junhwi Park, Donguk Lee, Daejin Lim and Kwanjung Yee

Applied Energy, 2022, vol. 328, issue C, No S0306261922014179

Abstract: Recently, a fuel cell-battery hybrid system (FBHS) has attracted considerable attention as a potential propulsion system for electric vertical take-off and landing (eVTOL) aircraft. For the conceptual design of FBHS-powered eVTOL aircraft, the FBHS sizing method requires parameterized weight estimation that reflects the power distribution ratio between the two power sources and the expected production time point. However, previous studies on FBHS sizing mainly focused on weight estimation based on actual product data. Thus, this study proposes a refined sizing method of FBHS for eVTOL aircraft that meets the requirements necessary at the conceptual design phase. The sizing method was parameterized at the component level, and the operating characteristics of the battery and fuel cell were reflected in the sizing. Each battery and fuel cell system sizing was performed, and the results showed that it is necessary to consider the operating characteristics of the battery or fuel cell when sizing rather than simply using constant specific energy or power. The FBHS-powered eVTOL aircraft sizing and sensitivity analysis were performed using the proposed method, considering the power distribution ratio between the two power sources. The results were derived by quantifying the technological development trends of each FBHS component and matching the expected production time to 2025 and 2035. In addition, the battery charging time required to fully charge the battery after performing all missions was calculated. The results indicated that the operational and manufacturing plan should be considered when designing the FBHS-powered eVTOL aircraft and prioritizing investments in technologies necessary for viable FBHS-powered eVTOL aircraft.

Keywords: Fuel cell-battery hybrid system; Propulsion system sizing; Conceptual design; eVTOL aircraft; Technological development trend (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.apenergy.2022.120160

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