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• W3199522728 abstract "The ejector driven by the high-pressure gas potential energy from the hydrogen storage tank can reliably recirculate the unconsumed hydrogen in the proton exchange membrane fuel cell (PEMFC) system. However, the fixed-geometry ejector cannot maintain consistently high performance among the whole power output range in the PEMFC system due to its shortage of limited operating range. In this paper, a coaxial two-nozzle ejector, satisfying the requirements of the PEMFC system under different power outputs, is developed for hydrogen recirculation. The proposed ejector is investigated numerically based on an experimentally verified simulation model to reveal the flow distribution and predict its performance. The simulation results show that the proposed ejector can work in a wide power range of 17.90–84.00 kW within a suitable supply hydrogen pressure range of 4–7 bar. More importantly, the ejector can not only maintain a recirculation ratio above 0.9 in the wide output power range but a high recirculation ratio greater than 2.0 in the low power output. The proposed ejector broadens the working range of a single ejector used in the PEMFC system, which significantly promotes the development of fuel cell being widely adopted in automobiles. • A coaxial two-nozzle ejector used for hydrogen recirculation is designed. • The flow characteristic of the proposed coaxial two-nozzle ejector is presented. • The proposed method extends the operating range of ejector based hydrogen recirculation." @default.
• W3199522728 created "2021-09-27" @default.
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• W3199522728 date "2021-11-01" @default.
• W3199522728 modified "2023-10-01" @default.
• W3199522728 title "Performance investigation on a coaxial-nozzle ejector for PEMFC hydrogen recirculation system" @default.
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• W3199522728 doi "https://doi.org/10.1016/j.ijhydene.2021.09.048" @default.
• W3199522728 hasPublicationYear "2021" @default.
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