Air injection test on a Kaplan turbine: Prototype - Model comparison

Autores
Angulo, Mauricio Abel; Rivetti, Arturo; Díaz, Leonardo; Liscia, Sergio Oscar
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Air injection is a very well-known resource to reduce pressure pulsation magnitude in turbines, especially on Francis type. In the case of large Kaplan designs, even when not so usual, it could be a solution to mitigate vibrations arising when tip vortex cavitation phenomenon becomes erosive and induces structural vibrations. In order to study this alternative, aeration tests were performed on a Kaplan turbine at model and prototype scales. The research was focused on efficiency of different air flow rates injected in reducing vibrations, especially at the draft tube and the discharge ring and also in the efficiency drop magnitude. It was found that results on both scales presents the same trend in particular for vibration levels at the discharge ring. The efficiency drop was overestimated on model tests while on prototype were less than 0.2 % for all power output. On prototype, air has a beneficial effect in reducing pressure fluctuations up to 0.2 ‰ of air flow rate. On model high speed image computing helped to quantify the volume of tip vortex cavitation that is strongly correlated with the vibration level. The hydrophone measurements did not capture the cavitation intensity when air is injected, however on prototype, it was detected by a sonometer installed at the draft tube access gallery.
Facultad de Ingeniería
Materia
Ingeniería Hidráulica
Turbinas
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/3.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/86496

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spelling Air injection test on a Kaplan turbine: Prototype - Model comparisonAngulo, Mauricio AbelRivetti, ArturoDíaz, LeonardoLiscia, Sergio OscarIngeniería HidráulicaTurbinasAir injection is a very well-known resource to reduce pressure pulsation magnitude in turbines, especially on Francis type. In the case of large Kaplan designs, even when not so usual, it could be a solution to mitigate vibrations arising when tip vortex cavitation phenomenon becomes erosive and induces structural vibrations. In order to study this alternative, aeration tests were performed on a Kaplan turbine at model and prototype scales. The research was focused on efficiency of different air flow rates injected in reducing vibrations, especially at the draft tube and the discharge ring and also in the efficiency drop magnitude. It was found that results on both scales presents the same trend in particular for vibration levels at the discharge ring. The efficiency drop was overestimated on model tests while on prototype were less than 0.2 % for all power output. On prototype, air has a beneficial effect in reducing pressure fluctuations up to 0.2 ‰ of air flow rate. On model high speed image computing helped to quantify the volume of tip vortex cavitation that is strongly correlated with the vibration level. The hydrophone measurements did not capture the cavitation intensity when air is injected, however on prototype, it was detected by a sonometer installed at the draft tube access gallery.Facultad de Ingeniería2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/86496enginfo:eu-repo/semantics/altIdentifier/issn/1755-1307info:eu-repo/semantics/altIdentifier/doi/10.1088/1755-1315/49/2/022006info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/3.0/Creative Commons Attribution 3.0 Unported (CC BY 3.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T11:08:36Zoai:sedici.unlp.edu.ar:10915/86496Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:08:36.945SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Air injection test on a Kaplan turbine: Prototype - Model comparison
title Air injection test on a Kaplan turbine: Prototype - Model comparison
spellingShingle Air injection test on a Kaplan turbine: Prototype - Model comparison
Angulo, Mauricio Abel
Ingeniería Hidráulica
Turbinas
title_short Air injection test on a Kaplan turbine: Prototype - Model comparison
title_full Air injection test on a Kaplan turbine: Prototype - Model comparison
title_fullStr Air injection test on a Kaplan turbine: Prototype - Model comparison
title_full_unstemmed Air injection test on a Kaplan turbine: Prototype - Model comparison
title_sort Air injection test on a Kaplan turbine: Prototype - Model comparison
dc.creator.none.fl_str_mv Angulo, Mauricio Abel
Rivetti, Arturo
Díaz, Leonardo
Liscia, Sergio Oscar
author Angulo, Mauricio Abel
author_facet Angulo, Mauricio Abel
Rivetti, Arturo
Díaz, Leonardo
Liscia, Sergio Oscar
author_role author
author2 Rivetti, Arturo
Díaz, Leonardo
Liscia, Sergio Oscar
author2_role author
author
author
dc.subject.none.fl_str_mv Ingeniería Hidráulica
Turbinas
topic Ingeniería Hidráulica
Turbinas
dc.description.none.fl_txt_mv Air injection is a very well-known resource to reduce pressure pulsation magnitude in turbines, especially on Francis type. In the case of large Kaplan designs, even when not so usual, it could be a solution to mitigate vibrations arising when tip vortex cavitation phenomenon becomes erosive and induces structural vibrations. In order to study this alternative, aeration tests were performed on a Kaplan turbine at model and prototype scales. The research was focused on efficiency of different air flow rates injected in reducing vibrations, especially at the draft tube and the discharge ring and also in the efficiency drop magnitude. It was found that results on both scales presents the same trend in particular for vibration levels at the discharge ring. The efficiency drop was overestimated on model tests while on prototype were less than 0.2 % for all power output. On prototype, air has a beneficial effect in reducing pressure fluctuations up to 0.2 ‰ of air flow rate. On model high speed image computing helped to quantify the volume of tip vortex cavitation that is strongly correlated with the vibration level. The hydrophone measurements did not capture the cavitation intensity when air is injected, however on prototype, it was detected by a sonometer installed at the draft tube access gallery.
Facultad de Ingeniería
description Air injection is a very well-known resource to reduce pressure pulsation magnitude in turbines, especially on Francis type. In the case of large Kaplan designs, even when not so usual, it could be a solution to mitigate vibrations arising when tip vortex cavitation phenomenon becomes erosive and induces structural vibrations. In order to study this alternative, aeration tests were performed on a Kaplan turbine at model and prototype scales. The research was focused on efficiency of different air flow rates injected in reducing vibrations, especially at the draft tube and the discharge ring and also in the efficiency drop magnitude. It was found that results on both scales presents the same trend in particular for vibration levels at the discharge ring. The efficiency drop was overestimated on model tests while on prototype were less than 0.2 % for all power output. On prototype, air has a beneficial effect in reducing pressure fluctuations up to 0.2 ‰ of air flow rate. On model high speed image computing helped to quantify the volume of tip vortex cavitation that is strongly correlated with the vibration level. The hydrophone measurements did not capture the cavitation intensity when air is injected, however on prototype, it was detected by a sonometer installed at the draft tube access gallery.
publishDate 2016
dc.date.none.fl_str_mv 2016
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