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Experimental study on the primary flow expansion characteristics in transcritical CO2 two-phase ejectors with different primary nozzle diverging angles

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  • Li, Yafei
  • Deng, Jianqiang
  • Ma, Li

Abstract

This paper presented an experimental study to explore the primary flow expansion characteristics in the transcritical CO2 two-phase ejectors for various primary nozzle diverging angles (NDAs) and secondary flow pressure. The phase change of the primary flow was visualized, and the effect of the primary flow expansion state on the entrainment ratio was evaluated. The results disclosed that the primary flow changed from the under-expanded state to the over-expanded state with increasing the NDA, and the primary flow expansion state was insensitive to the secondary flow pressure. The visualization images showed that the phase change position moved towards the nozzle exit visibly when the NDA was 0.0°, and the effect of secondary flow pressure on the phase change position was insignificant. Besides, the results revealed that the over-expanded state of primary flow had a negative effect on the entrainment ratio, and the entrainment ratio obtained the maximum when the NDA was 2.0°. The present work is indispensable to realize a comprehensive understanding of the primary flow expansion mechanism inside the transcritical CO2 ejector, and the insights gained from this study may be of assistance to optimize the ejector structure and improve the ejector performance.

Suggested Citation

  • Li, Yafei & Deng, Jianqiang & Ma, Li, 2019. "Experimental study on the primary flow expansion characteristics in transcritical CO2 two-phase ejectors with different primary nozzle diverging angles," Energy, Elsevier, vol. 186(C).
    • Handle: RePEc:eee:energy:v:186:y:2019:i:c:s0360544219315117
    DOI: 10.1016/j.energy.2019.07.169
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    Citations

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    Cited by:

    1. Lixing Zheng & Yiyan Zhang & Lifen Hao & Haojie Lian & Jianqiang Deng & Wei Lu, 2022. "Modelling, Optimization, and Experimental Studies of Refrigeration CO 2 Ejectors: A Review," Mathematics, MDPI, vol. 10(22), pages 1-23, November.
    2. Lixing Zheng & Hongwei Hu & Weibo Wang & Yiyan Zhang & Lingmei Wang, 2022. "Study on Flow Distribution and Structure Optimization in a Mix Chamber and Diffuser of a CO 2 Two-Phase Ejector," Mathematics, MDPI, vol. 10(5), pages 1-16, February.
    3. Fatong Jia & Dazhang Yang & Jing Xie, 2021. "Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters," Energies, MDPI, vol. 14(21), pages 1-16, October.
    4. Li, Hao & Gong, Xiufeng & Xu, Wenjie & Li, Minxia & Dang, Chaobin, 2020. "Effects of climate on the solar-powered R1234ze/CO2 cascade cycle for space cooling," Renewable Energy, Elsevier, vol. 153(C), pages 870-883.
    5. Tang, Yongzhi & Yuan, Jiali & Liu, Zhongliang & Feng, Qing & Gong, Xiaolong & Lu, Lin & Chua, Kian Jon, 2022. "Study on evolution laws of two-phase choking flow and entrainment performance of steam ejector oriented towards MED-TVC desalination system," Energy, Elsevier, vol. 242(C).
    6. Li, Yafei & Deng, Jianqiang, 2022. "Numerical investigation on the performance of transcritical CO2 two-phase ejector with a novel non-equilibrium CFD model," Energy, Elsevier, vol. 238(PC).

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