On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines
The rotor stator interaction in a low specific speed Francis model turbine and a pump-turbine is analyzed utilizing pressure sensors in the vaneless space and in the guide vane cascade. The measurements are analyzed relative to the runner angular position by utilizing an absolute encoder mounted on...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2019/5375149 |
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| _version_ | 1832551917679542272 |
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| author | Einar Agnalt Igor Iliev Bjørn W. Solemslie Ole G. Dahlhaug |
| author_facet | Einar Agnalt Igor Iliev Bjørn W. Solemslie Ole G. Dahlhaug |
| author_sort | Einar Agnalt |
| collection | DOAJ |
| description | The rotor stator interaction in a low specific speed Francis model turbine and a pump-turbine is analyzed utilizing pressure sensors in the vaneless space and in the guide vane cascade. The measurements are analyzed relative to the runner angular position by utilizing an absolute encoder mounted on the shaft end. From the literature, the pressure in the analyzed area is known to be a combination of two effects: the rotating runner pressure and the throttling of the guide vane channels. The measured pressure is fitted to a mathematical pressure model to separate the two effects for two different runners. One turbine with 15+15 splitter blades and full-length blades and one pump-turbine with six blades are investigated. The blade loading on the two runners is different, giving different input for the pressure model. The main findings show that the pressure fluctuations in the guide vane cascade are mainly controlled by throttling for the low blade loading case and the rotating runner pressure for the higher blade loading case. |
| format | Article |
| id | doaj-art-f467aa7ab7f049d49869e8f908d47c60 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-f467aa7ab7f049d49869e8f908d47c602025-02-03T06:00:16ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342019-01-01201910.1155/2019/53751495375149On the Rotor Stator Interaction Effects of Low Specific Speed Francis TurbinesEinar Agnalt0Igor Iliev1Bjørn W. Solemslie2Ole G. Dahlhaug3Waterpower Laboratory, Department of Energy and Process Engineering, NTNU-Norwegian University of Science and Technology, Trondheim, NorwayWaterpower Laboratory, Department of Energy and Process Engineering, NTNU-Norwegian University of Science and Technology, Trondheim, NorwayWaterpower Laboratory, Department of Energy and Process Engineering, NTNU-Norwegian University of Science and Technology, Trondheim, NorwayWaterpower Laboratory, Department of Energy and Process Engineering, NTNU-Norwegian University of Science and Technology, Trondheim, NorwayThe rotor stator interaction in a low specific speed Francis model turbine and a pump-turbine is analyzed utilizing pressure sensors in the vaneless space and in the guide vane cascade. The measurements are analyzed relative to the runner angular position by utilizing an absolute encoder mounted on the shaft end. From the literature, the pressure in the analyzed area is known to be a combination of two effects: the rotating runner pressure and the throttling of the guide vane channels. The measured pressure is fitted to a mathematical pressure model to separate the two effects for two different runners. One turbine with 15+15 splitter blades and full-length blades and one pump-turbine with six blades are investigated. The blade loading on the two runners is different, giving different input for the pressure model. The main findings show that the pressure fluctuations in the guide vane cascade are mainly controlled by throttling for the low blade loading case and the rotating runner pressure for the higher blade loading case.http://dx.doi.org/10.1155/2019/5375149 |
| spellingShingle | Einar Agnalt Igor Iliev Bjørn W. Solemslie Ole G. Dahlhaug On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines International Journal of Rotating Machinery |
| title | On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines |
| title_full | On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines |
| title_fullStr | On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines |
| title_full_unstemmed | On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines |
| title_short | On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines |
| title_sort | on the rotor stator interaction effects of low specific speed francis turbines |
| url | http://dx.doi.org/10.1155/2019/5375149 |
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