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Study on Vortex Zone of Draft Tube and Improvement Measures of Francis Turbine
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Zai-qiang WU1, Ya-tao LIN1, Ying-bo GUAN1, Ze-qin CHEN1, Jun-hui XU2, Yuan ZHENG3
Water Resources and Power | 2023, 41(7) : 197 - 200
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Water Resources and Power | 2023, 41(7): 197-200
• ELECTROMECHANICS AND CONTROL ENGINEERING •
Study on Vortex Zone of Draft Tube and Improvement Measures of Francis Turbine
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Zai-qiang WU1, Ya-tao LIN1, Ying-bo GUAN1, Ze-qin CHEN1, Jun-hui XU2, Yuan ZHENG3
Affiliations
  • 1.Fujian Provincial Electric Power Company Limited Electric Research Insititute, Fuzhou 350007, China
  • 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China
  • 3.College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
Published: 2023-07-25 doi: 10.20040/j.cnki.1000-7709.2023.20221706
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Due to the long-term operation in the low-load area, the hydropower unit deviates from the optimal operation area, resulting in large vibration of the unit, poor flow state of water flow, and other adverse consequences, such as cracks in runner blades and serious cavitation of the unit. In view of the complex flow conditions in the draft tube, this paper proposes two improvement schemes. Based on RANS equation, the standard SST κ-ω turbulence model is adopted to calculate the steady and unsteady solutions for three operating conditions of 0.45Pr(Pr is rated output), 0.60Pr, and 0.75Pr. The results show that the installation of the guiding device can effectively reduce the eccentric vortex band of the draft tube, and greatly reduce the pressure pulsation amplitude, so as to reduce the vibration of the unit. Considering the streamline of draft tube, vortex zone of draft pipe, turbine efficiency and pressure pulsation amplitude, especially the importance of pressure pulsation intensity to the stable operation of the turbine, it is concluded that the symmetrical arrangement of two diversion plates at the inlet of the draft tube has the better improvement effect on the Francis turbine. The results provide a certain theoretical basis for the safe operation of the hydraulic turbine unit under low load.

Francis turbine  /  low load  /  unsteady flow  /  pressure pulsation  /  guiding device
Zai-qiang WU, Ya-tao LIN, Ying-bo GUAN, Ze-qin CHEN, Jun-hui XU, Yuan ZHENG. Study on Vortex Zone of Draft Tube and Improvement Measures of Francis Turbine[J]. Water Resources and Power, 2023 , 41 (7) : 197 -200 . DOI: 10.20040/j.cnki.1000-7709.2023.20221706
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Year 2023 volume 41 Issue 7
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Article Info
doi: 10.20040/j.cnki.1000-7709.2023.20221706
  • Receive Date：2022-08-17
  • Online Date：2026-01-28
  • Published：2023-07-25
Article Data
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History
  • Received：2022-08-17
  • Revised：2022-09-14
Funding
Affiliations
    1.Fujian Provincial Electric Power Company Limited Electric Research Insititute, Fuzhou 350007, China
    2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China
    3.College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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