Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction
Hydroelectric power generation is an important clean energy source, and the stability of water turbine operation determines the quality of hydro energy utilization. For hydro turbines, the layout direction of the draft tube is often only considered from a structural perspective, ignoring the hydrody...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/22/4028 |
| _version_ | 1797457466226638848 |
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| author | Tao Zhang Zilong Hu Xinjun Liu Jiahao Lu Xijie Song Di Zhu Zhengwei Wang |
| author_facet | Tao Zhang Zilong Hu Xinjun Liu Jiahao Lu Xijie Song Di Zhu Zhengwei Wang |
| author_sort | Tao Zhang |
| collection | DOAJ |
| description | Hydroelectric power generation is an important clean energy source, and the stability of water turbine operation determines the quality of hydro energy utilization. For hydro turbines, the layout direction of the draft tube is often only considered from a structural perspective, ignoring the hydrodynamic characteristics. This study adopts the computational fluid dynamics method and verifies the effectiveness of numerical simulation with experimental results, analyzing the influence of asymmetric draft tube layout direction on pressure pulsation of mixed flow turbine. The results show that under different working conditions, there is basically no difference in efficiency corresponding to different inclined directions of the draft tube, and the relative difference in performance values is less than 1%. From the perspective of internal flow, the working condition has a greater impact on the flow, and the draft tube tilt has a smaller impact. Under strong swirling flow conditions in the draft tube, the variational mode decomposition of pressure fluctuation is carried out. Research has found 7 characteristic frequency bands including 140 Hz, 80–90 Hz, 40–46 Hz, 5.5–6.5 Hz, 2.5–3 Hz, 1.67 Hz, and <1 Hz. The frequency of the dominant mode corresponding to the left tilt is higher, while the amplitude of the runner frequency is slightly lower. In general, left tilt is not only more suitable for unit layout but also has a better effect on draft tube pressure fluctuation, which is worthy of application in engineering. |
| first_indexed | 2024-03-09T16:22:33Z |
| format | Article |
| id | doaj.art-4e5bb3f9f98343ecad9cd0015ab6d1f7 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-09T16:22:33Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-4e5bb3f9f98343ecad9cd0015ab6d1f72023-11-24T15:11:41ZengMDPI AGWater2073-44412023-11-011522402810.3390/w15224028Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement DirectionTao Zhang0Zilong Hu1Xinjun Liu2Jiahao Lu3Xijie Song4Di Zhu5Zhengwei Wang6Technical Management Department, Y. R. Wanjiazhai Water Multi-Purpose Dam Project Co., Ltd., Taiyuan 030000, ChinaCollege of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, ChinaPower Station Management Bureau, Y. R. Wanjiazhai Water Multi-Purpose Dam Project Co., Ltd., Taiyuan 030000, ChinaCollege of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, ChinaState Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, ChinaCollege of Engineering, China Agricultural University, Beijing 100083, ChinaState Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, ChinaHydroelectric power generation is an important clean energy source, and the stability of water turbine operation determines the quality of hydro energy utilization. For hydro turbines, the layout direction of the draft tube is often only considered from a structural perspective, ignoring the hydrodynamic characteristics. This study adopts the computational fluid dynamics method and verifies the effectiveness of numerical simulation with experimental results, analyzing the influence of asymmetric draft tube layout direction on pressure pulsation of mixed flow turbine. The results show that under different working conditions, there is basically no difference in efficiency corresponding to different inclined directions of the draft tube, and the relative difference in performance values is less than 1%. From the perspective of internal flow, the working condition has a greater impact on the flow, and the draft tube tilt has a smaller impact. Under strong swirling flow conditions in the draft tube, the variational mode decomposition of pressure fluctuation is carried out. Research has found 7 characteristic frequency bands including 140 Hz, 80–90 Hz, 40–46 Hz, 5.5–6.5 Hz, 2.5–3 Hz, 1.67 Hz, and <1 Hz. The frequency of the dominant mode corresponding to the left tilt is higher, while the amplitude of the runner frequency is slightly lower. In general, left tilt is not only more suitable for unit layout but also has a better effect on draft tube pressure fluctuation, which is worthy of application in engineering.https://www.mdpi.com/2073-4441/15/22/4028Francis turbinepressure pulsationdraft tube designhydrodynamic analysisvariational mode decomposition |
| spellingShingle | Tao Zhang Zilong Hu Xinjun Liu Jiahao Lu Xijie Song Di Zhu Zhengwei Wang Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction Water Francis turbine pressure pulsation draft tube design hydrodynamic analysis variational mode decomposition |
| title | Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction |
| title_full | Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction |
| title_fullStr | Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction |
| title_full_unstemmed | Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction |
| title_short | Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction |
| title_sort | comparison of pressure pulsation characteristics of francis turbine with different draft tube arrangement direction |
| topic | Francis turbine pressure pulsation draft tube design hydrodynamic analysis variational mode decomposition |
| url | https://www.mdpi.com/2073-4441/15/22/4028 |
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