| ANALYSIS AND ESTIMATION OF HYDRAULIC STABILITY OF FRANCIS HYDRO TURBINE |
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| 引用本文： | LAIXi-de. ANALYSIS AND ESTIMATION OF HYDRAULIC STABILITY OF FRANCIS HYDRO TURBINE[J]. 水动力学研究与进展(B辑), 2004, 16(2): 194-200 |
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| 作者姓名： | LAIXi-de |
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| 作者单位： | SchoolofEngrgyandEnvironment,XihuaUniversity,Chengdu610039,China,e-mail：tigerlai@bigfoot.com |
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| 基金项目： | ThisworkwassupportedbytheNationalNaturalScienceFoundationofChina (GrantNo :5 94 9370 4 )andPartiallysupportedbySichuanProvincialKeyDisiplines.(GrantNo :SZD0 4 12 ) |
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| 摘 要： | With the development of large-capacity hydro turbines, the hydraulic instability of hydro turbines has become one of the most important problems that affect the stable operation of the hydro-electric units. The hydraulic vibration and unstable operation of Francis hydro turbines are primarily caused by the unsteady pressure pulsations inside draft tubes. The forced rotating vortex core at the runner exit and the channel vortices inside Francis turbine runners are origins of the unsteady pressure pulsations when operating at partial load. This paper briefly analyzes the hydraulic instability of operation caused by the vortex core and channel vortices at partial load, then, presents a way to estimate the hydraulic stability by calculation of the flow behavior at the runner exit. The validity of estimation is examined by comparison with experimental data. This will be helpful to evaluate the alternative design and predict the hydraulic stability for both the prototype and model hydro turbines.
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| 关 键 词： | 涡流中心 水力稳定性 弗朗西斯水动涡轮机 性能估计 |
ANALYSIS AND ESTIMATION OF HYDRAULIC STABILITY OF FRANCIS HYDRO TURBINE |
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| LAI Xi-de School of Engrgy and Environment,Xihua University,Chengdu ,China. ANALYSIS AND ESTIMATION OF HYDRAULIC STABILITY OF FRANCIS HYDRO TURBINE[J]. Journal of Hydrodynamics, 2004, 16(2): 194-200 |
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| Authors: | LAI Xi-de School of Engrgy Environment Xihua University Chengdu China |
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| Affiliation: | LAI Xi-de School of Engrgy and Environment,Xihua University,Chengdu 610039,China |
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| Abstract: | With the development of large-capacity hydro turbines, the hydraulic instability of hydro turbines has become one of the most important problems that affect the stable operation of the hydro-electric units. The hydraulic vibration and unstable operation of Francis hydro turbines are primarily caused by the unsteady pressure pulsations inside draft tubes. The forced rotating vortex core at the runner exit and the channel vortices inside Francis turbine runners are origins of the unsteady pressure pulsations when operating at partial load. This paper briefly analyzes the hydraulic instability of operation caused by the vortex core and channel vortices at partial load, then, presents a way to estimate the hydraulic stability by calculation of the flow behavior at the runner exit. The validity of estimation is examined by comparison with experimental data. This will be helpful to evaluate the alternative design and predict the hydraulic stability for both the prototype and model hydro turbines. |
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| Keywords: | Francis hydro turbines hydraulic stability vortex core performance estimation |
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