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Numerical research on unsteady flow rate characteristics of pump as turbine

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  • Su, Xianghui
  • Huang, Si
  • Zhang, Xuejiao
  • Yang, Sunsheng

Abstract

Pump as turbine (PAT), an effective and simple way to recover energy from high pressure fluid, has been one of hot issues in scientific research and engineering applications. Unlike previous computational fluid dynamics (CFD) work on PAT's velocity and pressure fields, this paper first focused on the internal flow rate characteristics, attempted to reveal the periodic rules of flow rate distribution. The transient CFD calculation was performed on a conventional centrifugal pump as turbine, time dependent flow rate was captured and analyzed in computational fluid domains by Lagrangian and Eulerian viewpoints. The results show that time-averaged velocity varies in an overall decline trend from cross section 1–8 of the volute. Net fluid passing into in certain some sections and out in other sections in the gap region between the rotor and volute. The frequent bi-directional flow in the regions of the gap and the lateral chambers is found. The flow rate is significant out of the rotor at section 8 on prediction of turbine performance when ignoring the bilateral chambers in CFD. Experiments were carried out to verify the accuracy of numerical results for three specific speeds of PAT.

Suggested Citation

  • Su, Xianghui & Huang, Si & Zhang, Xuejiao & Yang, Sunsheng, 2016. "Numerical research on unsteady flow rate characteristics of pump as turbine," Renewable Energy, Elsevier, vol. 94(C), pages 488-495.
    • Handle: RePEc:eee:renene:v:94:y:2016:i:c:p:488-495
    DOI: 10.1016/j.renene.2016.03.092
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    References listed on IDEAS

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    1. Štefan, David & Rossi, Mosè & Hudec, Martin & Rudolf, Pavel & Nigro, Alessandra & Renzi, Massimiliano, 2020. "Study of the internal flow field in a pump-as-turbine (PaT): Numerical investigation, overall performance prediction model and velocity vector analysis," Renewable Energy, Elsevier, vol. 156(C), pages 158-172.
    2. Lin, Tong & Li, Xiaojun & Zhu, Zuchao & Xie, Jing & Li, Yi & Yang, Hui, 2021. "Application of enstrophy dissipation to analyze energy loss in a centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 163(C), pages 41-55.
    3. Du, Jiyun & Yang, Hongxing & Shen, Zhicheng & Chen, Jian, 2017. "Micro hydro power generation from water supply system in high rise buildings using pump as turbines," Energy, Elsevier, vol. 137(C), pages 431-440.
    4. Emma Frosina & Dario Buono & Adolfo Senatore, 2017. "A Performance Prediction Method for Pumps as Turbines (PAT) Using a Computational Fluid Dynamics (CFD) Modeling Approach," Energies, MDPI, vol. 10(1), pages 1-19, January.
    5. Huang, Si & Qiu, Guangqi & Su, Xianghui & Chen, Junrong & Zou, Wenlang, 2017. "Performance prediction of a centrifugal pump as turbine using rotor-volute matching principle," Renewable Energy, Elsevier, vol. 108(C), pages 64-71.
    6. Liu, Ming & Tan, Lei & Cao, Shuliang, 2019. "Theoretical model of energy performance prediction and BEP determination for centrifugal pump as turbine," Energy, Elsevier, vol. 172(C), pages 712-732.
    7. Xiuli Mao & Andrea Dal Monte & Ernesto Benini & Yuan Zheng, 2017. "Numerical Study on the Internal Flow Field of a Reversible Turbine during Continuous Guide Vane Closing," Energies, MDPI, vol. 10(7), pages 1-22, July.
    8. Carravetta, A. & Fecarotta, O. & Ramos, H.M., 2018. "A new low-cost installation scheme of PATs for pico-hydropower to recover energy in residential areas," Renewable Energy, Elsevier, vol. 125(C), pages 1003-1014.
    9. Lucie Zemanová & Pavel Rudolf, 2020. "Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review," Energies, MDPI, vol. 13(24), pages 1-37, December.
    10. Sengpanich, K. & Bohez, Erik L.J. & Thongkruer, P. & Sakulphan, K., 2019. "New mode to operate centrifugal pump as impulse turbine," Renewable Energy, Elsevier, vol. 140(C), pages 983-993.
    11. Hongyu, Guan & Wei, Jiang & Yuchuan, Wang & Hui, Tian & Ting, Li & Diyi, Chen, 2021. "Numerical simulation and experimental investigation on the influence of the clocking effect on the hydraulic performance of the centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 168(C), pages 21-30.
    12. Jianxin Hu & Wenfeng Su & Ke Li & Kexin Wu & Ling Xue & Guolei He, 2023. "Transient Hydrodynamic Behavior of a Pump as Turbine with Varying Rotating Speed," Energies, MDPI, vol. 16(4), pages 1-17, February.
    13. Renzi, Massimiliano & Rudolf, Pavel & Štefan, David & Nigro, Alessandra & Rossi, Mosè, 2019. "Installation of an axial Pump-as-Turbine (PaT) in a wastewater sewer of an oil refinery: A case study," Applied Energy, Elsevier, vol. 250(C), pages 665-676.
    14. Wang, Tao & Kong, Fanyu & Xia, Bin & Bai, Yuxing & Wang, Chuan, 2017. "The method for determining blade inlet angle of special impeller using in turbine mode of centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 109(C), pages 518-528.

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