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A Study on the Unsteady Flow Characteristics and Energy Conversion in the Volute of a Pump-as-Turbine Device

Senchun Miao1,2,*, Hongbiao Zhang1, Wanglong Tian1, Yinqiang Li2

1 School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
2 Jiangsu Shuangda Pump Valve Group Co., Ltd., Jingjiang, 214537, China

* Corresponding Author: Senchun Miao. Email: email

Fluid Dynamics & Materials Processing 2021, 17(6), 1021-1036. https://doi.org/10.32604/fdmp.2021.016925

Abstract

To study the unsteady flow and related energy conversion process in the volute of a pump-as-turbine (PAT) device, six different working conditions have been considered. Through numerical calculation, the spatio-temporal variation of static pressure, dynamic pressure, total pressure and turbulent energy dissipation have been determined in each section of the volute. It is concluded that the reduction of the total power of two adjacent sections of the PAT volute is equal to the sum of the power lost by the fluid while moving from one section to the other and the power output from the two adjacent sections. For a fixed flow rate, the percentage of static pressure energy at the outlet of the PAT is roughly similar to that of the corresponding volute section, and both show a gradually increasing trend. The turbulent dissipation rate on each section of the PAT volute displays a similar a spatio-temporal behavior for different flow rates.

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Cite This Article

Miao, S., Zhang, H., Tian, W., Li, Y. (2021). A Study on the Unsteady Flow Characteristics and Energy Conversion in the Volute of a Pump-as-Turbine Device. FDMP-Fluid Dynamics & Materials Processing, 17(6), 1021–1036.



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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