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Numerical study of primary steam superheating effects on steam ejector flow and its pumping performance

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  • Wang, Xiaodong
  • Dong, Jingliang
  • Li, Ao
  • Lei, Hongjian
  • Tu, Jiyuan

Abstract

The effects of primary steam superheating on steam condensation in nozzle and the performance of steam ejector were investigated using CFD (computational fluid dynamics) method. Using a wet steam model being proposed in our previous study, simulations based on the primary steam with five superheated levels were performed, and the results demonstrate the superheating operation of the primary steam weakens the spontaneous condensation intensity and postpones its occurrence within the nozzle vicinity. Due to the droplets nucleation refinement for the condensation of superheated steam, the mixing process between the primary and the secondary fluids is improved. Consequently, a higher entrainment ratio is achieved. However, the superheating operation may not exceed 20 K, as its contribution on entrainment ratio improvement is not as significant as 0 K–20 K superheating, and too much superheating will requires more energy as input, which is not a practical solution to further improve the steam ejector pumping performance.

Suggested Citation

  • Wang, Xiaodong & Dong, Jingliang & Li, Ao & Lei, Hongjian & Tu, Jiyuan, 2014. "Numerical study of primary steam superheating effects on steam ejector flow and its pumping performance," Energy, Elsevier, vol. 78(C), pages 205-211.
    • Handle: RePEc:eee:energy:v:78:y:2014:i:c:p:205-211
    DOI: 10.1016/j.energy.2014.10.004
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    References listed on IDEAS

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    1. Sharifi, Navid & Boroomand, Masoud & Kouhikamali, Ramin, 2012. "Wet steam flow energy analysis within thermo-compressors," Energy, Elsevier, vol. 47(1), pages 609-619.
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    Cited by:

    1. Wang, Xiaodong & Dong, Jingliang & Zhang, Guangli & Fu, Qiang & Li, He & Han, Yu & Tu, Jiyuan, 2019. "The primary pseudo-shock pattern of steam ejector and its influence on pumping efficiency based on CFD approach," Energy, Elsevier, vol. 167(C), pages 224-234.
    2. 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.
    3. Jafarian, Ali & Azizi, Mohammad & Forghani, Pezhman, 2016. "Experimental and numerical investigation of transient phenomena in vacuum ejectors," Energy, Elsevier, vol. 102(C), pages 528-536.
    4. 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).
    5. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    6. Zhang, Guojie & Dykas, Sławomir & Li, Pan & Li, Hang & Wang, Junlei, 2020. "Accurate condensing steam flow modeling in the ejector of the solar-driven refrigeration system," Energy, Elsevier, vol. 212(C).
    7. Tashtoush, Bourhan M. & Al-Nimr, Moh'd A. & Khasawneh, Mohammad A., 2019. "A comprehensive review of ejector design, performance, and applications," Applied Energy, Elsevier, vol. 240(C), pages 138-172.
    8. Ahmadpour, A. & Noori Rahim Abadi, S.M.A. & Meyer, J.P., 2017. "On the performance enhancement of thermo-compressor and steam turbine blade cascade in the presence of spontaneous nucleation," Energy, Elsevier, vol. 119(C), pages 675-693.

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