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The effect of tongue geometry on pump performance in reverse mode: An experimental study

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  • Alemi Arani, Hamed
  • Fathi, Mohammad
  • Raisee, Mehrdad
  • Nourbakhsh, Seyed Ahmad

Abstract

Low specific speed centrifugal pumps can operate as turbine in micro hydropower plants with relatively high head and low flowrate. Improving the hydraulic and mechanical characteristics of reverse pumps in such applications is highly appreciated. In the present study, the effect of tongue geometry on the performance and radial force of a low specific speed centrifugal reverse pump (10.3 [rpm, m3/s, m]) was studied experimentally. By measuring the flowrate, torque, inlet and outlet pressure as well as pressure distribution around the impeller periphery, hydraulic and mechanical characteristics of reverse pump for tongues of different stretchings and angles were obtained. Results showed that medium stretching can be used for reducing the radial force while further stretching of tongue is not beneficial. However, the longest tongue can boost efficiency the most. At nominal and high flowrates, tongue with medium stretching of angle −5° can rise the efficiency and output power at the highest level comparing with other angles, while that of −10° angle gives better condition at low capacities. The longest tongue of −10° could rise efficiency and output power up to 8% and 32% respectively in off-design conditions which makes it the best geometry for the reverse pump.

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  • Alemi Arani, Hamed & Fathi, Mohammad & Raisee, Mehrdad & Nourbakhsh, Seyed Ahmad, 2019. "The effect of tongue geometry on pump performance in reverse mode: An experimental study," Renewable Energy, Elsevier, vol. 141(C), pages 717-727.
    • Handle: RePEc:eee:renene:v:141:y:2019:i:c:p:717-727
    DOI: 10.1016/j.renene.2019.03.092
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    References listed on IDEAS

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    Cited by:

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    2. Wang, Tao & Xiang, Ru & Yu, He & Zhou, Min, 2023. "Performance improvement of forward-curved impeller with an adequate outlet swirl using in centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 204(C), pages 67-76.
    3. 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.
    4. Stefanizzi, Michele & Capurso, Tommaso & Balacco, Gabriella & Binetti, Mario & Camporeale, Sergio Mario & Torresi, Marco, 2020. "Selection, control and techno-economic feasibility of Pumps as Turbines in Water Distribution Networks," Renewable Energy, Elsevier, vol. 162(C), pages 1292-1306.
    5. Morabito, Alessandro & Vagnoni, Elena & Di Matteo, Mariano & Hendrick, Patrick, 2021. "Numerical investigation on the volute cutwater for pumps running in turbine mode," Renewable Energy, Elsevier, vol. 175(C), pages 807-824.
    6. Li, Xiaojun & Chen, Bo & Luo, Xianwu & Zhu, Zuchao, 2020. "Effects of flow pattern on hydraulic performance and energy conversion characterisation in a centrifugal pump," Renewable Energy, Elsevier, vol. 151(C), pages 475-487.

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