Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity
Tubular turbines are widely used in low water head and tidal power development due to their straight flow path, simple structure, and wide efficient area. However, the severe vibration during actual operation greatly affects the safe operation of the tubular turbine. This study performs a numerical...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/4/791 |
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| author | Yaping Zhao Yanrong Li Jianjun Feng Mengfan Dang Yajing Ren Xingqi Luo |
| author_facet | Yaping Zhao Yanrong Li Jianjun Feng Mengfan Dang Yajing Ren Xingqi Luo |
| author_sort | Yaping Zhao |
| collection | DOAJ |
| description | Tubular turbines are widely used in low water head and tidal power development due to their straight flow path, simple structure, and wide efficient area. However, the severe vibration during actual operation greatly affects the safe operation of the tubular turbine. This study performs a numerical calculation of the tubular turbine, which meets the actual machine conditions considering the free surface and water gravity; compares and analyzes the flow characteristics and pressure fluctuation spectrum characteristics in the tubular turbine under different water heads; and verifies the comparison with the actual machine test results to explore the vibration characteristics and vibration mechanism of the tubular turbine. Research results show that a large pressure difference is observed between the top and bottom of the runner chamber, and the runner needs to experience large periodic pressure fluctuations during rotation due to the combined effect of hydrostatic pressure and hydrodynamic pressure. Under different water heads, obvious flow turbulence and high turbulent kinetic energy areas are observed in the runner and draft tube due to the influence of the shape of the blade wake vortex. The vibration in the tubular turbine is mainly concentrated in the runner and draft tube and influenced by the water gravity and the runner structure of the transverse cantilever beam. The amplitude of pressure fluctuation is the largest when the frequency inside the runner is the blade passing frequency at each water head, so the maximum vibration position is located at the runner. The research results serve as a guide for the design and operation of the horizontal tubular turbine. |
| first_indexed | 2024-03-11T07:59:38Z |
| format | Article |
| id | doaj.art-59326a1671644a2ebd61033774a3a6ca |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T07:59:38Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-59326a1671644a2ebd61033774a3a6ca2023-11-16T23:53:32ZengMDPI AGWater2073-44412023-02-0115479110.3390/w15040791Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water GravityYaping Zhao0Yanrong Li1Jianjun Feng2Mengfan Dang3Yajing Ren4Xingqi Luo5Institute of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, ChinaInstitute of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, ChinaInstitute of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, ChinaInstitute of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, ChinaInstitute of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, ChinaInstitute of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, ChinaTubular turbines are widely used in low water head and tidal power development due to their straight flow path, simple structure, and wide efficient area. However, the severe vibration during actual operation greatly affects the safe operation of the tubular turbine. This study performs a numerical calculation of the tubular turbine, which meets the actual machine conditions considering the free surface and water gravity; compares and analyzes the flow characteristics and pressure fluctuation spectrum characteristics in the tubular turbine under different water heads; and verifies the comparison with the actual machine test results to explore the vibration characteristics and vibration mechanism of the tubular turbine. Research results show that a large pressure difference is observed between the top and bottom of the runner chamber, and the runner needs to experience large periodic pressure fluctuations during rotation due to the combined effect of hydrostatic pressure and hydrodynamic pressure. Under different water heads, obvious flow turbulence and high turbulent kinetic energy areas are observed in the runner and draft tube due to the influence of the shape of the blade wake vortex. The vibration in the tubular turbine is mainly concentrated in the runner and draft tube and influenced by the water gravity and the runner structure of the transverse cantilever beam. The amplitude of pressure fluctuation is the largest when the frequency inside the runner is the blade passing frequency at each water head, so the maximum vibration position is located at the runner. The research results serve as a guide for the design and operation of the horizontal tubular turbine.https://www.mdpi.com/2073-4441/15/4/791horizontal shaft tubular turbinewater gravityrunner vibrationpressure pulsation |
| spellingShingle | Yaping Zhao Yanrong Li Jianjun Feng Mengfan Dang Yajing Ren Xingqi Luo Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity Water horizontal shaft tubular turbine water gravity runner vibration pressure pulsation |
| title | Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity |
| title_full | Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity |
| title_fullStr | Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity |
| title_full_unstemmed | Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity |
| title_short | Vibration Characteristics of a Tubular Turbine Prototype at Different Heads with Considering Free Surface and Water Gravity |
| title_sort | vibration characteristics of a tubular turbine prototype at different heads with considering free surface and water gravity |
| topic | horizontal shaft tubular turbine water gravity runner vibration pressure pulsation |
| url | https://www.mdpi.com/2073-4441/15/4/791 |
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