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Experimental Investigations on the Inner Flow Behavior of Centrifugal Pumps under Inlet Air-Water Two-Phase Conditions

Author

Listed:
  • Qiaorui Si

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China)

  • Haoyang Zhang

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China)

  • Gérard Bois

    (LMFL, FRE CNRS 3723, Arts et Métiers ParisTech, 59046 Lille, France)

  • Jinfeng Zhang

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China)

  • Qianglei Cui

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China)

  • Shouqi Yuan

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China)

Abstract

Centrifugal pumps are widely used and are known to be sensitive to inlet air-water two-phase flow conditions. The pump performance degradation mainly depends on the changes in the two-phase flow behavior inside the pump. In the present paper, experimental overall pump performance tests were performed for two different rotational speeds and several inlet air void fractions ( α i ) up to pump shut-off condition. Visualizations were also performed on the flow patterns of a whole impeller passage and the volute tongue area to physically understand pump performance degradation. The results showed that liquid flow modification does not follow head modification as described by affinity laws, which are only valid for homogeneous bubbly flow regimes. Three-dimensional effects were more pronounced when inlet void fraction increased up to 3%. Bubbly flow with low mean velocities were observed close to the volute tongue for all α i , and returned back to the impeller blade passages. The starting point of pump break down was related to a strong inward reverse flow that occurred in the vicinity of the shroud gap between the impeller and volute tongue area.

Suggested Citation

  • Qiaorui Si & Haoyang Zhang & Gérard Bois & Jinfeng Zhang & Qianglei Cui & Shouqi Yuan, 2019. "Experimental Investigations on the Inner Flow Behavior of Centrifugal Pumps under Inlet Air-Water Two-Phase Conditions," Energies, MDPI, vol. 12(22), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4377-:d:287985
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    References listed on IDEAS

    as
    1. Qifeng Jiang & Yaguang Heng & Xiaobing Liu & Weibin Zhang & Gérard Bois & Qiaorui Si, 2019. "A Review of Design Considerations of Centrifugal Pump Capability for Handling Inlet Gas-Liquid Two-Phase Flows," Energies, MDPI, vol. 12(6), pages 1-18, March.
    2. Jianjun Zhu & Hong-Quan Zhang, 2018. "A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps," Energies, MDPI, vol. 11(1), pages 1-41, January.
    3. Qiaorui Si & Gérard Bois & Qifeng Jiang & Wenting He & Asad Ali & Shouqi Yuan, 2018. "Investigation on the Handling Ability of Centrifugal Pumps under Air–Water Two-Phase Inflow: Model and Experimental Validation," Energies, MDPI, vol. 11(11), pages 1-17, November.
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    Cited by:

    1. Qiaorui Si & Gérard Bois & Minquan Liao & Haoyang Zhang & Qianglei Cui & Shouqi Yuan, 2019. "A Comparative Study on Centrifugal Pump Designs and Two-Phase Flow Characteristic under Inlet Gas Entrainment Conditions," Energies, MDPI, vol. 13(1), pages 1-25, December.
    2. Asad Ali & Jianping Yuan & Fanjie Deng & Biaobiao Wang & Liangliang Liu & Qiaorui Si & Noman Ali Buttar, 2021. "Research Progress and Prospects of Multi-Stage Centrifugal Pump Capability for Handling Gas–Liquid Multiphase Flow: Comparison and Empirical Model Validation," Energies, MDPI, vol. 14(4), pages 1-34, February.
    3. Fan Zhang & Lufeng Zhu & Ke Chen & Weicheng Yan & Desmond Appiah & Bo Hu, 2020. "Numerical Simulation of Gas–Liquid Two-Phase Flow Characteristics of Centrifugal Pump Based on the CFD–PBM," Mathematics, MDPI, vol. 8(5), pages 1-19, May.

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