A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit
S-shaped characteristics in turbine mode are prone to instabilities in associated transient processes. A single value of the speed factor corresponds to multiple values of the discharge factor, having the possibility of changing the operating point among the turbine, turbine brake, and reverse pump...
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| Format: | Article |
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MDPI AG
2021-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/3/525 |
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| author | Jun-Won Suh Seung-Jun Kim Hyeon-Mo Yang Moo-Sung Kim Won-Gu Joo Jungwan Park Jin-Hyuk Kim Young-Seok Choi |
| author_facet | Jun-Won Suh Seung-Jun Kim Hyeon-Mo Yang Moo-Sung Kim Won-Gu Joo Jungwan Park Jin-Hyuk Kim Young-Seok Choi |
| author_sort | Jun-Won Suh |
| collection | DOAJ |
| description | S-shaped characteristics in turbine mode are prone to instabilities in associated transient processes. A single value of the speed factor corresponds to multiple values of the discharge factor, having the possibility of changing the operating point among the turbine, turbine brake, and reverse pump modes. Because of this characteristic, the S-shaped curves induce instability in transient processes. Understanding the hydraulic behavior of a turbine on the four-quadrant characteristic is important since it provides detailed performance information through the whole discharge range of the turbine. This study was numerically and experimentally investigated the scale effect on the S-shaped characteristics in the turbine transition region. The four-quadrant characteristic curves (full- and laboratory-scale) in the turbine mode were predicted by numerical simulations. To verify the predicted results, a laboratory-scale experiment was performed in the turbine, turbine brake, and reverse pump modes. Although the full-scale experiment was performed in the normal operating head range, the scale effect can be validated by comparing steady operating points between the two models. Based on the verified results, the internal flow and pressure pulsation characteristics were determined at the operating point in a specific transition region. |
| first_indexed | 2024-03-09T04:14:07Z |
| format | Article |
| id | doaj.art-812c874287024a33b894e873f1f8e3ad |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T04:14:07Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-812c874287024a33b894e873f1f8e3ad2023-12-03T13:56:18ZengMDPI AGEnergies1996-10732021-01-0114352510.3390/en14030525A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine UnitJun-Won Suh0Seung-Jun Kim1Hyeon-Mo Yang2Moo-Sung Kim3Won-Gu Joo4Jungwan Park5Jin-Hyuk Kim6Young-Seok Choi7Clean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, KoreaClean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, KoreaClean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, KoreaDepartment of Mechanical Engineering, Yonsei University, Seoul 03722, KoreaDepartment of Mechanical Engineering, Yonsei University, Seoul 03722, KoreaHydropower Design & Technology Group, Korea Hydro & Nuclear Power Co., Ltd., Daejeon 34101, KoreaClean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, KoreaClean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, KoreaS-shaped characteristics in turbine mode are prone to instabilities in associated transient processes. A single value of the speed factor corresponds to multiple values of the discharge factor, having the possibility of changing the operating point among the turbine, turbine brake, and reverse pump modes. Because of this characteristic, the S-shaped curves induce instability in transient processes. Understanding the hydraulic behavior of a turbine on the four-quadrant characteristic is important since it provides detailed performance information through the whole discharge range of the turbine. This study was numerically and experimentally investigated the scale effect on the S-shaped characteristics in the turbine transition region. The four-quadrant characteristic curves (full- and laboratory-scale) in the turbine mode were predicted by numerical simulations. To verify the predicted results, a laboratory-scale experiment was performed in the turbine, turbine brake, and reverse pump modes. Although the full-scale experiment was performed in the normal operating head range, the scale effect can be validated by comparing steady operating points between the two models. Based on the verified results, the internal flow and pressure pulsation characteristics were determined at the operating point in a specific transition region.https://www.mdpi.com/1996-1073/14/3/525pump turbineS-shaped characteristicstransient phenomenascale effectnumerical analysisexperiment |
| spellingShingle | Jun-Won Suh Seung-Jun Kim Hyeon-Mo Yang Moo-Sung Kim Won-Gu Joo Jungwan Park Jin-Hyuk Kim Young-Seok Choi A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit Energies pump turbine S-shaped characteristics transient phenomena scale effect numerical analysis experiment |
| title | A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit |
| title_full | A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit |
| title_fullStr | A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit |
| title_full_unstemmed | A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit |
| title_short | A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit |
| title_sort | comparative study of the scale effect on the s shaped characteristics of a pump turbine unit |
| topic | pump turbine S-shaped characteristics transient phenomena scale effect numerical analysis experiment |
| url | https://www.mdpi.com/1996-1073/14/3/525 |
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