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Power optimization and comparison between simple recuperated and recompressing supercritical carbon dioxide Closed-Brayton-Cycle with finite cold source on hypersonic vehicles

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  • Cheng, Kunlin
  • Qin, Jiang
  • Sun, Hongchuang
  • Li, Heng
  • He, Shuai
  • Zhang, Silong
  • Bao, Wen

Abstract

Closed-Brayton-cycle (CBC) is a potential onboard power generation technology for hypersonic vehicles, but finite cold source limits its power output. To achieve higher electric power, this study presents the power optimization and comparison between the simple recuperated and recompressing supercritical carbon dioxide (S-CO2) CBC. Results indicate that the temperature distribution of precooler is essential to obtain its pinch point temperature difference. There is optimal fuel temperature difference in precooler for electric power of S-CO2 CBCs. Although the recompressing layout has advantages on thermal efficiency, the simple recuperated layout exhibits better on electric power per unit mass flowrate of fuel (219.6 kW vs. 192.5 kW), because the latter utilizes more cooling capacity of fuel. Besides, the optimal inlet temperature of compressor for electric power with finite cold source is far higher than the design value for general S-CO2 compressors (389 K vs. ∼305 K). In a word, it is more reasonable to develop the simple recuperated S-CO2 closed-Brayton-cycle as onboard power generation system of hypersonic vehicles.

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  • 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.
  • Handle: RePEc:eee:energy:v:181:y:2019:i:c:p:1189-1201
    DOI: 10.1016/j.energy.2019.06.010
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    4. 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.
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    7. Li, Chaolong & Xia, Zhixun & Ma, Likun & Chen, Binbin & Feng, Yunchao & Zhang, Jiarui & Duan, Yifan, 2023. "Performance analysis on the specific impulse and specific thrust of scramjet with a quasi-one-dimensional model," Energy, Elsevier, vol. 267(C).
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    12. Xu, Jing & Cheng, Kunlin & Dang, Chaolei & Wang, Yilin & Liu, Zekuan & Qin, Jiang & Liu, Xiaoyong, 2023. "Performance comparison of liquid metal cooling system and regenerative cooling system in supersonic combustion ramjet engines," Energy, Elsevier, vol. 275(C).
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    14. Cheng, Kunlin & Qin, Jiang & Zhang, Duo & Bao, Wen & Jing, Wuxing, 2022. "Performance evaluation for a combined power generation system of closed-Brayton-cycle and thermoelectric generator with finite cold source at room temperature on hypersonic vehicles," Energy, Elsevier, vol. 254(PC).

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