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

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 ind...

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Detalles Bibliográficos
Autores principales: Angulo, Mauricio Abel, Rivetti, Arturo, Díaz, Leonardo, Liscia, Sergio Oscar
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ingeniería Hidráulica
Turbinas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86496
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86496
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería Hidráulica
Turbinas
spellingShingle Ingeniería Hidráulica
Turbinas
Angulo, Mauricio Abel
Rivetti, Arturo
Díaz, Leonardo
Liscia, Sergio Oscar
Air injection test on a Kaplan turbine: Prototype - Model comparison
topic_facet Ingeniería Hidráulica
Turbinas
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.
format Articulo
Articulo
author Angulo, Mauricio Abel
Rivetti, Arturo
Díaz, Leonardo
Liscia, Sergio Oscar
author_facet Angulo, Mauricio Abel
Rivetti, Arturo
Díaz, Leonardo
Liscia, Sergio Oscar
author_sort Angulo, Mauricio Abel
title Air injection test on a Kaplan turbine: Prototype - Model comparison
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
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86496
work_keys_str_mv AT angulomauricioabel airinjectiontestonakaplanturbineprototypemodelcomparison
AT rivettiarturo airinjectiontestonakaplanturbineprototypemodelcomparison
AT diazleonardo airinjectiontestonakaplanturbineprototypemodelcomparison
AT lisciasergiooscar airinjectiontestonakaplanturbineprototypemodelcomparison
bdutipo_str Repositorios
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