High load vortex oscillations developed in Francis turbines

Francis turbines operating at high load conditions produce a typical flow pattern in the draft tube cone characterized by the presence of an axisymmetric central vortex. This central cavity could become unstable, generating synchronic pressure pulsations, usually called self-excited oscillations, wh...

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Autores principales: Rodríguez, Daniel Amancio, Rivetti, Arturo, Lucino, Cecilia Verónica
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ingeniería Hidráulica
Turbinas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86494
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86494
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
Rodríguez, Daniel Amancio
Rivetti, Arturo
Lucino, Cecilia Verónica
High load vortex oscillations developed in Francis turbines
topic_facet Ingeniería Hidráulica
Turbinas
description Francis turbines operating at high load conditions produce a typical flow pattern in the draft tube cone characterized by the presence of an axisymmetric central vortex. This central cavity could become unstable, generating synchronic pressure pulsations, usually called self-excited oscillations, which propagate into the whole machine. The on-set and size of the central vortex cavity depend on the geometry of the runner and draft tube and on the operating point as well. Numerical flow simulations and model tests allow for the characterization of the different flow patterns induced by each particular Francis turbine design and, when studied in combination with the hydraulic system, including the intake and penstock, could predict the prototype hydraulic behavior for the complete operation zone. The present work focuses the CFD simulation on the development and dynamic behavior of the central axisymmetric vortex for a medium-head Francis turbine operating at high load conditions. The CFD simulations are based in two-phase transient calculations. Oscillation frequencies against its cavity volume development were obtained and good correlation was found with experimental results.
format Articulo
Articulo
author Rodríguez, Daniel Amancio
Rivetti, Arturo
Lucino, Cecilia Verónica
author_facet Rodríguez, Daniel Amancio
Rivetti, Arturo
Lucino, Cecilia Verónica
author_sort Rodríguez, Daniel Amancio
title High load vortex oscillations developed in Francis turbines
title_short High load vortex oscillations developed in Francis turbines
title_full High load vortex oscillations developed in Francis turbines
title_fullStr High load vortex oscillations developed in Francis turbines
title_full_unstemmed High load vortex oscillations developed in Francis turbines
title_sort high load vortex oscillations developed in francis turbines
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86494
work_keys_str_mv AT rodriguezdanielamancio highloadvortexoscillationsdevelopedinfrancisturbines
AT rivettiarturo highloadvortexoscillationsdevelopedinfrancisturbines
AT lucinoceciliaveronica highloadvortexoscillationsdevelopedinfrancisturbines
bdutipo_str Repositorios
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