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Influence of Tip Clearance on Pressure Fluctuation in Low Specific Speed Mixed-Flow Pump Passage

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 influence of tip clearance on pressure fluctuation in a low specific speed mixed-flow pump, tip clearances δ of 0.25 mm, 0.75 mm and 1.00 mm, along with no tip clearance, were selected. The reliability of the simulation was verified by comparison with the experimental data of external characteristics and fluctuation in the guide vane passage. Through ANSYS-CFX, MATLAB code and fast Fourier transform (FFT) algorithm, pressure fluctuation characteristics in this pump were obtained. The results show that pressure fluctuation exists in all conditions due to the rotor-stator interaction. Under the no tip clearance and tip clearance conditions, the maximum fluctuation value was located near the guide inlet and impeller outlet, respectively. Clearance leakage had less influence on pressure fluctuation at the impeller inlet and central regions within a certain range of the clearance; beyond this range, fluctuations in the whole flow passage increased significantly, while the clearance variation had less effect on fluctuation in the guide vane. When the tip clearance value was 1.00 mm, pressure fluctuation of the shroud at the impeller inlet section suddenly increases, which was closely related to the obvious leakage vortexes and a larger low pressure area.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:2:p:148-:d:88622
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    Citations

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    Cited by:

    1. 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.
    2. Liu, Yabin & Tan, Lei, 2018. "Tip clearance on pressure fluctuation intensity and vortex characteristic of a mixed flow pump as turbine at pump mode," Renewable Energy, Elsevier, vol. 129(PA), pages 606-615.
    3. 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.
    4. Liu, Yabin & Han, Yadong & Tan, Lei & Wang, Yuming, 2020. "Blade rotation angle on energy performance and tip leakage vortex in a mixed flow pump as turbine at pump mode," Energy, Elsevier, vol. 206(C).
    5. Xi, Shen & Desheng, Zhang & Bin, Xu & Weidong, Shi & (Bart) van Esch, B.P.M., 2021. "Experimental and numerical investigation on the effect of tip leakage vortex induced cavitating flow on pressure fluctuation in an axial flow pump," Renewable Energy, Elsevier, vol. 163(C), pages 1195-1209.
    6. Zhe Ma & Baoshan Zhu & Cong Rao & Yonghong Shangguan, 2019. "Comprehensive Hydraulic Improvement and Parametric Analysis of a Francis Turbine Runner," Energies, MDPI, vol. 12(2), pages 1-20, January.
    7. Yabin Liu & Lei Tan & Binbin Wang, 2018. "A Review of Tip Clearance in Propeller, Pump and Turbine," Energies, MDPI, vol. 11(9), pages 1-30, August.

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