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Performance Assessment of Closed-Brayton-Cycle and Thermoelectric Generator Combined Power Generation System Coupled with Hydrocarbon-Fueled Scramjet

Author

Listed:
  • Kunlin Cheng

    (Harbin Institute of Technology, Harbin 150001, China
    Chongqing Research Institute, Harbin Institute of Technology, Chongqing 401120, China)

  • Wuxing Jing

    (Harbin Institute of Technology, Harbin 150001, China)

  • Jiahui Li

    (Harbin Institute of Technology, Harbin 150001, China)

  • Jiang Qin

    (Harbin Institute of Technology, Harbin 150001, China
    Chongqing Research Institute, Harbin Institute of Technology, Chongqing 401120, China)

Abstract

Closed-Brayton-cycle (CBC) is a potential scheme to provide high-power electricity for hypersonic vehicles, but finite cold source onboard limits its power level. A thermoelectric generator (TEG) combined with CBC is a feasible power enhancement approach by extending the available temperature range of cold source. In this study, a performance assessment of the CBC-TEG combined power generation system coupled with hydrocarbon-fueled scramjet is performed to exhibit its possible operation characteristics and performance limitations on hypersonic vehicles. Results indicate that, at a fixed flight Mach number, a larger fuel equivalence ratio ( φ ) leads to a higher total electric power and CBC power but a lower TEG power. There are three limitations on the fuel equivalence ratio, TEG temperature difference, and combustion heat dissipation adjustment for the operation of CBC-TEG. The total power of CBC-TEG can be adjusted by φ , but the adjustable range becomes smaller at higher Ma. The electric quantity at unit fuel mass increases with φ , mainly due to the higher thermoelectric conversion efficiency. Moreover, the maximum value of the electric quantity at unit fuel mass for CBC-TEG reaches 277.0 kJ/kg, which is about 33.4% higher than that of standalone CBC.

Suggested Citation

  • Kunlin Cheng & Wuxing Jing & Jiahui Li & Jiang Qin, 2023. "Performance Assessment of Closed-Brayton-Cycle and Thermoelectric Generator Combined Power Generation System Coupled with Hydrocarbon-Fueled Scramjet," Energies, MDPI, vol. 16(21), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:21:p:7385-:d:1272044
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    References listed on IDEAS

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    3. Cheng, Kunlin & Qin, Jiang & Sun, Hongchuang & Li, Heng & He, Shuai & Zhang, Silong & Bao, Wen, 2019. "Power optimization and comparison between simple recuperated and recompressing supercritical carbon dioxide Closed-Brayton-Cycle with finite cold source on hypersonic vehicles," Energy, Elsevier, vol. 181(C), pages 1189-1201.
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