Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine
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 wit...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-01-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/10/1/96 |
| _version_ | 1811187587249864704 |
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| author | Zijie Wang Baoshan Zhu Xuhe Wang Daqing Qin |
| author_facet | Zijie Wang Baoshan Zhu Xuhe Wang Daqing Qin |
| author_sort | Zijie Wang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T14:06:01Z |
| format | Article |
| id | doaj.art-8ea009f0e3c8449e99013ee25a94075e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T14:06:01Z |
| publishDate | 2017-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-8ea009f0e3c8449e99013ee25a94075e2022-12-22T04:19:54ZengMDPI AGEnergies1996-10732017-01-011019610.3390/en10010096en10010096Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-TurbineZijie Wang0Baoshan Zhu1Xuhe Wang2Daqing Qin3Department of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, ChinaHarbin Institute of Large Electrical Machinery, Harbin 150040, ChinaNumerical 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.http://www.mdpi.com/1996-1073/10/1/96pump-turbinepressure fluctuationS-shaped regionvortex roperotating stall |
| spellingShingle | Zijie Wang Baoshan Zhu Xuhe Wang Daqing Qin Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine Energies pump-turbine pressure fluctuation S-shaped region vortex rope rotating stall |
| title | Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine |
| title_full | Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine |
| title_fullStr | Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine |
| title_full_unstemmed | Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine |
| title_short | Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine |
| title_sort | pressure fluctuations in the s shaped region of a reversible pump turbine |
| topic | pump-turbine pressure fluctuation S-shaped region vortex rope rotating stall |
| url | http://www.mdpi.com/1996-1073/10/1/96 |
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