On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load
The growing installation of intermittent renewable energy sources is forcing hydraulic turbines to work more frequently at speed no load when dangerous vaneless space vortex structures and stochastic flow phenomena can occur. An experimental campaign has been performed in a reduced-scale Kaplan turb...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/24/13285 |
| _version_ | 1797382105379897344 |
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| author | Rafel Roig Xavier Sánchez-Botello Berhanu Mulu Carl-Maikel Högström Xavier Escaler |
| author_facet | Rafel Roig Xavier Sánchez-Botello Berhanu Mulu Carl-Maikel Högström Xavier Escaler |
| author_sort | Rafel Roig |
| collection | DOAJ |
| description | The growing installation of intermittent renewable energy sources is forcing hydraulic turbines to work more frequently at speed no load when dangerous vaneless space vortex structures and stochastic flow phenomena can occur. An experimental campaign has been performed in a reduced-scale Kaplan turbine model at speed no load for different combinations of guide vane and runner blade angles under non-cavitation and cavitation conditions. Several simultaneous vaneless space vortex structures, all of them inducing torsional rotor vibrations, have been observed. Nonetheless, only one of them has been found to dominate over the rest depending on the blade and guide vane angles. Off-board pressures, torques and vibrations as well as on-board strains have been measured to characterize their nature, intensity, dynamic behavior and induced structural response. Their precession frequencies have been found to depend on the discharge factor, the number of vortices and their location inside the vaneless space. Under cavitation conditions, their dynamic behavior has not been significantly altered but the induced structural response has increased at the low-pressure side of the turbine. |
| first_indexed | 2024-03-08T21:01:41Z |
| format | Article |
| id | doaj.art-81a0a624f2384ddc9467752fe6e77000 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-08T21:01:41Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-81a0a624f2384ddc9467752fe6e770002023-12-22T13:52:07ZengMDPI AGApplied Sciences2076-34172023-12-0113241328510.3390/app132413285On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No LoadRafel Roig0Xavier Sánchez-Botello1Berhanu Mulu2Carl-Maikel Högström3Xavier Escaler4Barcelona Fluids & Energy Lab, Universitat Politècnica de Catalunya, 08034 Barcelona, SpainBarcelona Fluids & Energy Lab, Universitat Politècnica de Catalunya, 08034 Barcelona, SpainVattenfall AB, R&D Älvkarleby, 81470 Älvkarleby, SwedenVattenfall AB, R&D Älvkarleby, 81470 Älvkarleby, SwedenBarcelona Fluids & Energy Lab, Universitat Politècnica de Catalunya, 08034 Barcelona, SpainThe growing installation of intermittent renewable energy sources is forcing hydraulic turbines to work more frequently at speed no load when dangerous vaneless space vortex structures and stochastic flow phenomena can occur. An experimental campaign has been performed in a reduced-scale Kaplan turbine model at speed no load for different combinations of guide vane and runner blade angles under non-cavitation and cavitation conditions. Several simultaneous vaneless space vortex structures, all of them inducing torsional rotor vibrations, have been observed. Nonetheless, only one of them has been found to dominate over the rest depending on the blade and guide vane angles. Off-board pressures, torques and vibrations as well as on-board strains have been measured to characterize their nature, intensity, dynamic behavior and induced structural response. Their precession frequencies have been found to depend on the discharge factor, the number of vortices and their location inside the vaneless space. Under cavitation conditions, their dynamic behavior has not been significantly altered but the induced structural response has increased at the low-pressure side of the turbine.https://www.mdpi.com/2076-3417/13/24/13285speed no loadvaneless space vortex structurestructural dynamic responsemonitoring systemKaplan turbine model |
| spellingShingle | Rafel Roig Xavier Sánchez-Botello Berhanu Mulu Carl-Maikel Högström Xavier Escaler On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load Applied Sciences speed no load vaneless space vortex structure structural dynamic response monitoring system Kaplan turbine model |
| title | On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load |
| title_full | On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load |
| title_fullStr | On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load |
| title_full_unstemmed | On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load |
| title_short | On the Vaneless Space Vortex Structures in a Kaplan Turbine Model Operating at Speed No Load |
| title_sort | on the vaneless space vortex structures in a kaplan turbine model operating at speed no load |
| topic | speed no load vaneless space vortex structure structural dynamic response monitoring system Kaplan turbine model |
| url | https://www.mdpi.com/2076-3417/13/24/13285 |
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