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Numerical analysis of non-axisymmetric flow characteristic for a pump-turbine impeller at pump off-design condition

Author

Listed:
  • Xiaoran, Zhao
  • Yexiang, Xiao
  • Zhengwei, Wang
  • Hongying, Luo
  • Soo-Hwang, Ahn
  • Yangyang, Yao
  • Honggang, Fan

Abstract

The present paper analyzed the inner flow characteristic of a reversible pump-turbine at pump mode with the optimal guide vane opening. An unusual asymmetrical feature of both pressure fluctuation and flow pattern inside the rotating impeller was detected under a pump off-design condition, in which the flow rate is smaller than that of hump district. The steady and unsteady simulations were performed in ANSYS 16.0 with the SAS SST-CC turbulence model. The simulation results of pressure fluctuations show that there exists a noteworthy difference of pressure amplitudes in each rotating flow passage, which is not obvious under other conditions. Flow pattern analysis indicates that the impeller flow fields are asymmetrical in different passages under this pump off-design condition, with significant flow separation and vortexes. When exploring the possible causes for this particular flow pattern, it is revealed that the specific elbow structure has an impact on the flow distribution in the draft tube. Flow separation and reverse flow are discovered in the conical and elbow part of the draft tube, which leads to the uneven flow pattern at the impeller inlet. It is demonstrated that there is a close relationship between unsteady flow structures and asymmetrical pressure fluctuation characteristic.

Suggested Citation

  • Xiaoran, Zhao & Yexiang, Xiao & Zhengwei, Wang & Hongying, Luo & Soo-Hwang, Ahn & Yangyang, Yao & Honggang, Fan, 2018. "Numerical analysis of non-axisymmetric flow characteristic for a pump-turbine impeller at pump off-design condition," Renewable Energy, Elsevier, vol. 115(C), pages 1075-1085.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:1075-1085
    DOI: 10.1016/j.renene.2017.06.088
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    Cited by:

    1. Wang, Kaijie & Wang, Shuli & Meng, Puyu & Wang, Chengpeng & Li, Yuhai & Zheng, Wenxian & Liu, Jun & Kou, Jiawen, 2023. "Strategies employed in the design and optimization of pump as turbine runner," Renewable Energy, Elsevier, vol. 216(C).
    2. Hu, Zanao & Cheng, Yongguang & Liu, Demin & Chen, Hongyu & Ji, Bin & Ding, Jinghuan, 2023. "Broadening the operating range of pump-turbine to deep-part load by runner optimization," Renewable Energy, Elsevier, vol. 207(C), pages 73-88.
    3. Yu, An & Wang, Yongshuai & Tang, Qinghong & Lv, Ruirui & Yang, Zhongpo, 2021. "Investigation of the vortex evolution and hydraulic excitation in a pump-turbine operating at different conditions," Renewable Energy, Elsevier, vol. 171(C), pages 462-478.
    4. Suh, Jun-Won & Kim, Seung-Jun & Kim, Jin-Hyuk & Joo, Won-Gu & Park, Jungwan & Choi, Young-Seok, 2020. "Effect of interface condition on the hydraulic characteristics of a pump-turbine at various guide vane opening conditions in pump mode," Renewable Energy, Elsevier, vol. 154(C), pages 986-1004.

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