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Numerical Study of Pressure Fluctuation in a Gas- Liquid Two-Phase Mixed-Flow Pump

Author

Listed:
  • Wenwu Zhang

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Zhiyi Yu

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Baoshan Zhu

    (State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China)

Abstract

To explore the pressure fluctuation characteristics in a mixed-flow pump handling a gas-liquid two-phase flow, an unsteady simulation was carried out with ANSYS CFX for the whole flow passage when the inlet gas void fraction ( IGVF ) was 0%, 5%, and 10%, respectively. Under pure water conditions ( IGVF = 0%), the reliability of the simulation was verified by comparing with the experiment in both aspects of external characteristics and fluctuation. Through the implementation of the fast Fourier transform (FFT) algorithm, the characteristics of the pressure fluctuation in the impeller and the guide vane were obtained at different IGVF conditions. The results demonstrate that pressure fluctuations exist under different IGVF conditions due to the rotor-stator interaction and the gas-liquid phase interaction, and the intensity of the fluctuation is firstly enhanced, and then weakened, along the streamwise direction with the maximum located near the impeller outlet. The relationship between the gas content and the pressure fluctuation was analyzed, and it is shown that the regional pressure fluctuation will be intensified only if the gas content therein reaches a certain level and the local phase interaction is strong. In addition, the pressure fluctuation in both the rotor-stator interaction region and the guide vane may be effectively inhibited under small IGVF conditions.

Suggested Citation

  • Wenwu Zhang & Zhiyi Yu & Baoshan Zhu, 2017. "Numerical Study of Pressure Fluctuation in a Gas- Liquid Two-Phase Mixed-Flow Pump," Energies, MDPI, vol. 10(5), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:634-:d:97693
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    References listed on IDEAS

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    1. Wenwu Zhang & Zhiyi Yu & Baoshan Zhu, 2017. "Influence of Tip Clearance on Pressure Fluctuation in Low Specific Speed Mixed-Flow Pump Passage," Energies, MDPI, vol. 10(2), pages 1-16, January.
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    Cited by:

    1. Zhang, Wenwu & Xie, Xing & Zhu, Baoshan & Ma, Zhe, 2021. "Analysis of phase interaction and gas holdup in a multistage multiphase rotodynamic pump based on a modified Euler two-fluid model," Renewable Energy, Elsevier, vol. 164(C), pages 1496-1507.
    2. Wenwu Zhang & Zhiyi Yu & Muhammad Noaman Zahid & Yongjiang Li, 2018. "Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis," Energies, MDPI, vol. 11(5), pages 1-16, April.

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