Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode
Pumped storage units often deviate from the optimal operating conditions in the process of regulating new energy fluctuations. To effectively improve the performance of the units, the variable speed of the units is one of the more feasible means at present. This paper focuses on the part-load condit...
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| Language: | English |
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MDPI AG
2024-12-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/12/12/2243 |
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| author | Guangtai Shi Binyan Li Yexiang Xiao Manqi Tang Xi Yang |
| author_facet | Guangtai Shi Binyan Li Yexiang Xiao Manqi Tang Xi Yang |
| author_sort | Guangtai Shi |
| collection | DOAJ |
| description | Pumped storage units often deviate from the optimal operating conditions in the process of regulating new energy fluctuations. To effectively improve the performance of the units, the variable speed of the units is one of the more feasible means at present. This paper focuses on the part-load condition of turbine operation, with an emphasis on the internal flow characteristics and pressure pulsation characteristics of the pump turbine during the linear reduction of the rated speed. It is found that the streamlines in the runner become turbulent in the process of speed reduction, forming a vortex at the inlet of the runner, and the vortex scale gradually increases with the speed reduction. The vortex rope in the draft tube undergoes three types of changes during the speed reduction: helical eccentric vortex rope, vanishing vortex rope, and columnar vortex rope. Before the speed change, the low-frequency components with high amplitude exist in each flow-passing part, but gradually disappear with the speed reduction. Except for the runner, the frequency affected by rotor–stator interference of each flow-passing part increases with the decrease of speed, and the growth is most obvious in the vaneless region. The findings of this research can serve as a valuable reference for the variable speed operation of pumped storage units. |
| format | Article |
| id | doaj-art-81bf44d502bd4f39b33e835a10ccf709 |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-81bf44d502bd4f39b33e835a10ccf7092024-12-27T14:33:21ZengMDPI AGJournal of Marine Science and Engineering2077-13122024-12-011212224310.3390/jmse12122243Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine ModeGuangtai Shi0Binyan Li1Yexiang Xiao2Manqi Tang3Xi Yang4Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education, Chengdu 610039, ChinaKey Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education, Chengdu 610039, ChinaDepartment of Energy and Power Engineering, Tsinghua University, Beijing 100084, ChinaKey Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education, Chengdu 610039, ChinaKey Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education, Chengdu 610039, ChinaPumped storage units often deviate from the optimal operating conditions in the process of regulating new energy fluctuations. To effectively improve the performance of the units, the variable speed of the units is one of the more feasible means at present. This paper focuses on the part-load condition of turbine operation, with an emphasis on the internal flow characteristics and pressure pulsation characteristics of the pump turbine during the linear reduction of the rated speed. It is found that the streamlines in the runner become turbulent in the process of speed reduction, forming a vortex at the inlet of the runner, and the vortex scale gradually increases with the speed reduction. The vortex rope in the draft tube undergoes three types of changes during the speed reduction: helical eccentric vortex rope, vanishing vortex rope, and columnar vortex rope. Before the speed change, the low-frequency components with high amplitude exist in each flow-passing part, but gradually disappear with the speed reduction. Except for the runner, the frequency affected by rotor–stator interference of each flow-passing part increases with the decrease of speed, and the growth is most obvious in the vaneless region. The findings of this research can serve as a valuable reference for the variable speed operation of pumped storage units.https://www.mdpi.com/2077-1312/12/12/2243pump turbinevariable speedinternal flow characteristicspressure pulsation |
| spellingShingle | Guangtai Shi Binyan Li Yexiang Xiao Manqi Tang Xi Yang Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode Journal of Marine Science and Engineering pump turbine variable speed internal flow characteristics pressure pulsation |
| title | Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode |
| title_full | Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode |
| title_fullStr | Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode |
| title_full_unstemmed | Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode |
| title_short | Effect of Speed Linear Decrease on Internal Flow Characteristics and Pressure Pulsations of Variable-Speed Pump Turbine in Turbine Mode |
| title_sort | effect of speed linear decrease on internal flow characteristics and pressure pulsations of variable speed pump turbine in turbine mode |
| topic | pump turbine variable speed internal flow characteristics pressure pulsation |
| url | https://www.mdpi.com/2077-1312/12/12/2243 |
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