Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube
Swirling flow with the formation of a precessing vortex core (PVC) in the draft tube model of a hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions of the hydroturbine. The turbine operating conditions were varied by continuously changing...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-02-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/5/1240 |
| _version_ | 1797395406905147392 |
|---|---|
| author | Ivan Litvinov Daniil Suslov Evgeny Gorelikov Sergey Shtork |
| author_facet | Ivan Litvinov Daniil Suslov Evgeny Gorelikov Sergey Shtork |
| author_sort | Ivan Litvinov |
| collection | DOAJ |
| description | Swirling flow with the formation of a precessing vortex core (PVC) in the draft tube model of a hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions of the hydroturbine. The turbine operating conditions were varied by continuously changing the flow rate at a constant runner speed. The transition from the partial load regime, when a precessing vortex core is formed, to the best efficiency point without a core is considered. Applied to this task, a comparison of the windowed Fourier transform with wavelet analysis is given. The dependence of the PVC lifetime in the transient regime correlates with the transient time. It is shown that the velocity profiles and the spectrum of pressure pulsations in transient regimes change quasistatically between part-load operation and the best efficiency point of the turbine. The phase-averaged velocity distributions in the transient regimes show that a transient regime is a sequence of quasisteady regimes. |
| first_indexed | 2024-03-09T00:35:05Z |
| format | Article |
| id | doaj.art-f762c5aa518440c5b4dde584b782b901 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T00:35:05Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-f762c5aa518440c5b4dde584b782b9012023-12-11T18:16:30ZengMDPI AGEnergies1996-10732021-02-01145124010.3390/en14051240Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft TubeIvan Litvinov0Daniil Suslov1Evgeny Gorelikov2Sergey Shtork3Kutateladze Institute of Thermophysics, 630090 Novosibirsk, RussiaKutateladze Institute of Thermophysics, 630090 Novosibirsk, RussiaKutateladze Institute of Thermophysics, 630090 Novosibirsk, RussiaKutateladze Institute of Thermophysics, 630090 Novosibirsk, RussiaSwirling flow with the formation of a precessing vortex core (PVC) in the draft tube model of a hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions of the hydroturbine. The turbine operating conditions were varied by continuously changing the flow rate at a constant runner speed. The transition from the partial load regime, when a precessing vortex core is formed, to the best efficiency point without a core is considered. Applied to this task, a comparison of the windowed Fourier transform with wavelet analysis is given. The dependence of the PVC lifetime in the transient regime correlates with the transient time. It is shown that the velocity profiles and the spectrum of pressure pulsations in transient regimes change quasistatically between part-load operation and the best efficiency point of the turbine. The phase-averaged velocity distributions in the transient regimes show that a transient regime is a sequence of quasisteady regimes.https://www.mdpi.com/1996-1073/14/5/1240draft tubeprecessing vortex coretransient regimelaser-Doppler anemometeracoustic sensorsphase (conditional) averaging |
| spellingShingle | Ivan Litvinov Daniil Suslov Evgeny Gorelikov Sergey Shtork Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube Energies draft tube precessing vortex core transient regime laser-Doppler anemometer acoustic sensors phase (conditional) averaging |
| title | Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube |
| title_full | Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube |
| title_fullStr | Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube |
| title_full_unstemmed | Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube |
| title_short | Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube |
| title_sort | experimental study of transient flow regimes in a model hydroturbine draft tube |
| topic | draft tube precessing vortex core transient regime laser-Doppler anemometer acoustic sensors phase (conditional) averaging |
| url | https://www.mdpi.com/1996-1073/14/5/1240 |
| work_keys_str_mv | AT ivanlitvinov experimentalstudyoftransientflowregimesinamodelhydroturbinedrafttube AT daniilsuslov experimentalstudyoftransientflowregimesinamodelhydroturbinedrafttube AT evgenygorelikov experimentalstudyoftransientflowregimesinamodelhydroturbinedrafttube AT sergeyshtork experimentalstudyoftransientflowregimesinamodelhydroturbinedrafttube |