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Energies 2017, 10(1), 96; doi:10.3390/en10010096

Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine

Department of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, China
Harbin Institute of Large Electrical Machinery, Harbin 150040, China
Author to whom correspondence should be addressed.
Academic Editor: Hailong Li
Received: 11 June 2016 / Revised: 16 December 2016 / Accepted: 9 January 2017 / Published: 13 January 2017
(This article belongs to the Special Issue Advanced Energy Storage Technologies and Their Applications (AESA))
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Numerical simulations were performed to investigate pressure fluctuations in the S-shaped region of a pump-turbine model. Analyses focused on pressure fluctuations in the draft tube and in the gap between the guide vanes and runner. Calculations were made under six different operating conditions with a constant guide vane opening, and the best efficiency point, runaway point, and low-discharge point in the turbine brake zone were determined. The simulated results were compared with experimental measurements. In the draft tube, a twin vortex rope was observed. In the gap between the guide vanes and runner, a low frequency component was captured at both the runaway and low-discharge points in the turbine brake zone, which rotated at 65% of the runner frequency. This low frequency component was induced by the rotating stall phenomenon. At the runaway point, a single stall cell was found in the gap between the guide vanes and runner, while at the low-discharge point, four stall cells were observed. View Full-Text
Keywords: pump-turbine; pressure fluctuation; S-shaped region; vortex rope; rotating stall pump-turbine; pressure fluctuation; S-shaped region; vortex rope; rotating stall

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Z.; Zhu, B.; Wang, X.; Qin, D. Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine. Energies 2017, 10, 96.

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