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Numerical investigation on energy change field in a centrifugal pump as turbine under different flow rates

Author

Listed:
  • Chen, Xiaoping
  • Zhang, Zhiguo
  • Huang, Jianmin
  • Zhou, Xiaojie
  • Zhu, Zuchao

Abstract

The pump as turbine (PAT) is an economical and essential device that is widely used in micro hydropower and residual energy recovery. The energy change field, characterized by first and second energy change rate (LK1 and LK2), is investigated in main flow passage components of PAT under five flow rates ranging from 0.5QBEP to QBEP. The relationship between mean partial derivations of mechanical energy and flow rate is non-monotonic in the impeller, and it shows increasing and decreasing trends in the volute and draft tube, respectively. The large-LK2 regions exhibit positive correlation to complex internal flow structures. The mean LK1 (MLK1) in the impeller initially decreases and then increases slightly as flow rate increases, the opposite trends are observed in the volute and draft tube. There is a positive slope segment between the mean LK2 (MLK2) and flow rate in the impeller, which corresponds to the internal flow instability. The maximum values of MLK2 in the impeller and volute are 2.54 and 2.81, respectively, corresponding flow rates are 0.75QBEP and 0.875QBEP. As the flow rate increases, the standard deviations of MLK1 and MLK2 decreases significantly, and then reaches a steady value in impeller and volute region.

Suggested Citation

  • Chen, Xiaoping & Zhang, Zhiguo & Huang, Jianmin & Zhou, Xiaojie & Zhu, Zuchao, 2024. "Numerical investigation on energy change field in a centrifugal pump as turbine under different flow rates," Renewable Energy, Elsevier, vol. 230(C).
    • Handle: RePEc:eee:renene:v:230:y:2024:i:c:s0960148124008723
    DOI: 10.1016/j.renene.2024.120804
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