| NUMERICAL PREDICTION OF DYNAMIC PERFORMANCE OF PELTON TURBINE |
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| 作者姓名： | XIAO Ye-xiang HAN Feng-qin ZHOU Jing-lin KUBOTA Takashi |
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| 作者单位： | College of |
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| 摘 要： | Different from the reaction turbines, the hydraulic performance of Pelton turbine is dynamic due to the unsteady flow in the rotating buckets in time and space. The dynamic energy efficiency of bucket ηEB and power efficiency of bucket ηPB within a short period can be predicted from the dynamic flow pattern of the free-surface sheet flow in the rotating bucket, whereas the dynamic discharge efficiency of bucket ηQB is defined as the resident discharge in the bucket at the respective moment. Under the operation of higher unit speed nDH than the optimum one, the power efficiency of bucket is deteriorated by the jet interference with the rear surface of bucket ?Prear at the first stage of the dynamic performance, as well as the loss power due to the spilt flow from the cutout of bucket at the later stage of performance. Based on the dynamic performance prediction presented, the future possibility of the quantitative investigation for the negative scale effect of Pelton turbines was discussed.
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| 关 键 词： | 冲击式水轮机 动态能量效率 动态流量效率 动态功率效率 |
| 收稿时间： | 3 November 2006 |
| 修稿时间： | 2006-11-032007-01-23 |
NUMERICAL PREDICTION OF DYNAMIC PERFORMANCE OF PELTON TURBINE |
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| XIAO Ye-xiang HAN Feng-qin ZHOU Jing-lin KUBOTA Takashi.NUMERICAL PREDICTION OF DYNAMIC PERFORMANCE OF PELTON TURBINE[J].Journal of Hydrodynamics,2007,19(3):356-364. |
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| Authors: | XIAO Ye-xiang HAN Feng-qin ZHOU Jing-lin KUBOTA Takashi |
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| Affiliation: | 1. Alternate Hydro Energy Centre, IIT Roorkee, Roorkee, India;2. Lucerne School of Engineering and Architecture, Fluid Mechanics and Hydro Machines, Switzerland;1. National Agenda Research Division, Korea Institute of Science and Technology, South Korea;2. Dept. of Mechanical Engineering, Korea University, South Korea;1. State Key Laboratory of Hydroscience and Engineering & Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China;2. Dongfang Electric Machinery Co. Ltd, Deyang, Sichuan Province, 618000, China;3. China Three Gorges Mechanic & Electric Engineering Co., Ltd, Chengdu, Sichuan Province, 610014, China |
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| Abstract: | Different from the reaction turbines, the hydraulic performance of Pelton turbine is dynamic due to the unsteady flow in the rotating buckets in time and space. The dynamic energy efficiency of bucket ηEB and power efficiency of bucket ηPB within a short period can be predicted from the dynamic flow pattern of the free-surface sheet flow in the rotating bucket, whereas the dynamic discharge efficiency of bucket is defined as the resident discharge in the bucket at the respective moment. ηQB Under the operation of higher unit speed nDH than the optimum one, the power efficiency of bucket is deteriorated by the jet interference with the rear surface of bucket ΔPrear at the first stage of the dynamic performance, as well as the loss power due to the spilt flow from the cutout of bucket at the later stage of performance. Based on the dynamic performance prediction presented, the future possibility of the quantitative investigation for the negative scale effect of Pelton turbines was discussed. |
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| Keywords: | dynamic energy efficiency dynamic discharge efficiency dynamic power efficiency rotating bucket Pelton turbine |
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