Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation
Due to significant changes in the energy system, hydraulic turbines are required to operate over a wide power range. In particular, older turbines which are not designed for these environments will suffer under off-design conditions. In order to evaluate whether or not such a turbine could fulfill t...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-07-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/12/15/2893 |
| _version_ | 1817993221923405824 |
|---|---|
| author | Julian Unterluggauer Anton Maly Eduard Doujak |
| author_facet | Julian Unterluggauer Anton Maly Eduard Doujak |
| author_sort | Julian Unterluggauer |
| collection | DOAJ |
| description | Due to significant changes in the energy system, hydraulic turbines are required to operate over a wide power range. In particular, older turbines which are not designed for these environments will suffer under off-design conditions. In order to evaluate whether or not such a turbine could fulfill the new requirements of the energy market, a study about the behavior of a prototype plant in low-load operation is presented. Therefore, prototype site measurements are performed to determine the most damaging operating point by means of acceleration sensors and pressure transducers. Moreover, unsteady computational fluid dynamics (CFD) simulations considering two-phase flow and two hybrid turbulence models are used to analyze the flow conditions inside the turbine. The resulting pressure pulsations are mapped onto the runner blade to obtain stress and further calculate damage factors. Accordingly, the stresses are compared to those obtained by the strain gauge measurement. Moreover, the influence of active flow control by means of air injection on plant behavior and runner lifetime is discussed as well. |
| first_indexed | 2024-04-14T01:36:07Z |
| format | Article |
| id | doaj.art-deb414302e944d1cb8ea4e5f00fa3732 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-14T01:36:07Z |
| publishDate | 2019-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-deb414302e944d1cb8ea4e5f00fa37322022-12-22T02:19:56ZengMDPI AGEnergies1996-10732019-07-011215289310.3390/en12152893en12152893Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load OperationJulian Unterluggauer0Anton Maly1Eduard Doujak2Institute for Energy Systems and Thermodynamics/E302, TU Wien, Getreidemarkt 9/BA, 1060 Vienna, AustriaInstitute for Energy Systems and Thermodynamics/E302, TU Wien, Getreidemarkt 9/BA, 1060 Vienna, AustriaInstitute for Energy Systems and Thermodynamics/E302, TU Wien, Getreidemarkt 9/BA, 1060 Vienna, AustriaDue to significant changes in the energy system, hydraulic turbines are required to operate over a wide power range. In particular, older turbines which are not designed for these environments will suffer under off-design conditions. In order to evaluate whether or not such a turbine could fulfill the new requirements of the energy market, a study about the behavior of a prototype plant in low-load operation is presented. Therefore, prototype site measurements are performed to determine the most damaging operating point by means of acceleration sensors and pressure transducers. Moreover, unsteady computational fluid dynamics (CFD) simulations considering two-phase flow and two hybrid turbulence models are used to analyze the flow conditions inside the turbine. The resulting pressure pulsations are mapped onto the runner blade to obtain stress and further calculate damage factors. Accordingly, the stresses are compared to those obtained by the strain gauge measurement. Moreover, the influence of active flow control by means of air injection on plant behavior and runner lifetime is discussed as well.https://www.mdpi.com/1996-1073/12/15/2893prototype Francis turbineCFDfatigue analysisactive flow control |
| spellingShingle | Julian Unterluggauer Anton Maly Eduard Doujak Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation Energies prototype Francis turbine CFD fatigue analysis active flow control |
| title | Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation |
| title_full | Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation |
| title_fullStr | Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation |
| title_full_unstemmed | Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation |
| title_short | Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation |
| title_sort | investigation on the impact of air admission in a prototype francis turbine at low load operation |
| topic | prototype Francis turbine CFD fatigue analysis active flow control |
| url | https://www.mdpi.com/1996-1073/12/15/2893 |
| work_keys_str_mv | AT julianunterluggauer investigationontheimpactofairadmissioninaprototypefrancisturbineatlowloadoperation AT antonmaly investigationontheimpactofairadmissioninaprototypefrancisturbineatlowloadoperation AT eduarddoujak investigationontheimpactofairadmissioninaprototypefrancisturbineatlowloadoperation |