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Model optimization and mechanism analysis of two-stage ejector considering nonequilibrium condensation

Author

Listed:
  • Han, Qingyang
  • Feng, Haodong
  • Zhang, Hailun
  • Wang, Lei
  • Xue, Haoyuan
  • Sun, Wenxu
  • Jia, Lei

Abstract

Two-stage ejectors are widely used in multi-effect distillation and refrigeration systems owing to their vacuum and pressurization capabilities. However, most studies on two-stage ejectors are based on the dry-gas hypothesis, which neglects the universal physical phenomenon of condensation. A wet-steam model of two-stage ejectors is established and compared to the dry-gas model in this paper. Simulation results indicate that the proposed wet-steam model more accurately describes the performance and complex flow field characteristics of the two-stage ejector. Moreover, the nonequilibrium condensation mechanism of the fluid within the two-stage ejector under variable conditions is revealed. The results show that as the two-stage main nozzle pressure increases from 300 kPa to 550 kPa, the liquid mass fraction increases, and the droplet nucleation rate of the two stages decreases by 14.17 % and 13.14 %. When the first-stage actuating pressure is increased, the first-stage fluid restricts the expansion state of the second-stage main jet core and weakens the vapor condensation in the region of the shock chain. Furthermore, the experimental results demonstrate that compared with the dry-gas model, the prediction error of entrainment ratio and the secondary flow obtained by the proposed model are reduced by 26.67 % and 43.04 %, respectively.

Suggested Citation

  • Han, Qingyang & Feng, Haodong & Zhang, Hailun & Wang, Lei & Xue, Haoyuan & Sun, Wenxu & Jia, Lei, 2024. "Model optimization and mechanism analysis of two-stage ejector considering nonequilibrium condensation," Energy, Elsevier, vol. 310(C).
    • Handle: RePEc:eee:energy:v:310:y:2024:i:c:s0360544224030470
    DOI: 10.1016/j.energy.2024.133271
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    References listed on IDEAS

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    1. Yang, Yan & Zhu, Xiaowei & Yan, Yuying & Ding, Hongbing & Wen, Chuang, 2019. "Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation," Applied Energy, Elsevier, vol. 242(C), pages 157-167.
    2. Han, Qingyang & Liu, Changchao & Xue, Haoyuan & Zhang, Hailun & Sun, Wenhui & Sun, Wenxu & Jia, Lei, 2023. "Working condition expansion and performance optimization of two-stage ejector based on optimal switching strategy," Energy, Elsevier, vol. 282(C).
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