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Numerical Analysis of Unsteady Internal Flow Characteristics in a Bidirectional Axial Flow Pump

Author

Listed:
  • Yurui Dai

    (School of Mechanical Engineering, Nantong University, Nantong 226019, China)

  • Weidong Shi

    (School of Mechanical Engineering, Nantong University, Nantong 226019, China)

  • Yongfei Yang

    (School of Mechanical Engineering, Nantong University, Nantong 226019, China)

  • Zhanshan Xie

    (School of Mechanical Engineering, Nantong University, Nantong 226019, China)

  • Qinghong Zhang

    (School of Mechanical Engineering, Nantong University, Nantong 226019, China)

Abstract

A bidirectional axial flow pump that utilizes an S-shaped hydrofoil design exhibits low efficiency and hydraulic instability when operated in reverse. In order to understand the unsteady flow characteristics of this bidirectional axial pump under different operating conditions, the SST k – ω turbulence model was applied to carry out a three-dimensional unsteady numerical simulation of the full flow channel of the pump. The reliability of the numerical calculation model was verified by comparing it with the experimental head and efficiency. The pressure pulsation characteristics on the impeller surface and the pump device under different operating conditions and the transient forces on the impeller were analyzed. The results show that the head and efficiency in reverse operation were lower than in forward operation and the flow streamline of the impeller outlet area was more turbulent in the reverse operation condition. The monitoring points at the inlet and the top of the impeller surface showed the largest pressure pulsation amplitude. The radial and axial forces on the impeller in the reverse operation were greater than those in the forward operation. Under a reverse 1.0 Q des condition, the average pressure pulsation amplitudes at the inlet of the impeller were 19.2 times and 5.7 times of that at the inlet of the guide vane and the outlet of the impeller, respectively. This study provides a reference for the hydraulic design and optimization of bidirectional axial flow pumps.

Suggested Citation

  • Yurui Dai & Weidong Shi & Yongfei Yang & Zhanshan Xie & Qinghong Zhang, 2023. "Numerical Analysis of Unsteady Internal Flow Characteristics in a Bidirectional Axial Flow Pump," Sustainability, MDPI, vol. 16(1), pages 1-16, December.
    • Handle: RePEc:gam:jsusta:v:16:y:2023:i:1:p:224-:d:1307966
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    References listed on IDEAS

    as
    1. Honggeng Zhu & Ge Bo & Yuanbing Zhou & Rentian Zhang & Jilin Cheng, 2018. "Pump Selection and Performance Prediction for the Technical Innovation of an Axial-Flow Pump Station," Mathematical Problems in Engineering, Hindawi, vol. 2018, pages 1-9, August.
    2. Bozorgi, A. & Javidpour, E. & Riasi, A. & Nourbakhsh, A., 2013. "Numerical and experimental study of using axial pump as turbine in Pico hydropower plants," Renewable Energy, Elsevier, vol. 53(C), pages 258-264.
    3. Kan, Kan & Xu, Zhe & Chen, Huixiang & Xu, Hui & Zheng, Yuan & Zhou, Daqing & Muhirwa, Alexis & Maxime, Binama, 2022. "Energy loss mechanisms of transition from pump mode to turbine mode of an axial-flow pump under bidirectional conditions," Energy, Elsevier, vol. 257(C).
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