Pressure pulsation in Kaplan turbines: Prototype-CFD comparison

Pressure pulsation phenomena in a large Kaplan turbine are investigated by means of numerical simulations (CFD) and prototype measurements in order to study the dynamic behavior of flow due to the blade passage and its interaction with other components of the turbine. Numerical simulations are perfo...

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Autores principales: Rivetti, Arturo, Lucino, Cecilia Verónica, Liscia, Sergio Oscar, Muguerza, D., Avellan, François
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ingeniería
Pressure pulsation
Kaplan turbine
numerical simulations
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83642
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83642
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería
Pressure pulsation
Kaplan turbine
numerical simulations
spellingShingle Ingeniería
Pressure pulsation
Kaplan turbine
numerical simulations
Rivetti, Arturo
Lucino, Cecilia Verónica
Liscia, Sergio Oscar
Muguerza, D.
Avellan, François
Pressure pulsation in Kaplan turbines: Prototype-CFD comparison
topic_facet Ingeniería
Pressure pulsation
Kaplan turbine
numerical simulations
description Pressure pulsation phenomena in a large Kaplan turbine are investigated by means of numerical simulations (CFD) and prototype measurements in order to study the dynamic behavior of flow due to the blade passage and its interaction with other components of the turbine. Numerical simulations are performed with the commercial software Ansys CFX code, solving the incompressible Unsteady Reynolds-Averaged-Navier Stokes equations under a finite volume scheme. The computational domain involves the entire machine at prototype scale. Special care is taken in the discretization of the wicket gate overhang and runner blade gap. Prototype measurements are performed using pressure transducers at different locations among the wicket gate outlet and the draft tube inlet. Then, CFD results are compared with temporary signals of prototype measurements at identical locations to validate the numerical model. A detailed analysis was focused on the tip gap flow and the pressure field at the discharge ring. From a rotating reference frame perspective, it is found that the mean pressure fluctuates accordingly the wicket gate passage. Moreover, in prototype measurements the pressure frequency that reveals the presence of modulated cavitation at the discharge ring is distinguished, as also verified from the shape of erosion patches in concordance with the number of wicket gates.
format Articulo
Articulo
author Rivetti, Arturo
Lucino, Cecilia Verónica
Liscia, Sergio Oscar
Muguerza, D.
Avellan, François
author_facet Rivetti, Arturo
Lucino, Cecilia Verónica
Liscia, Sergio Oscar
Muguerza, D.
Avellan, François
author_sort Rivetti, Arturo
title Pressure pulsation in Kaplan turbines: Prototype-CFD comparison
title_short Pressure pulsation in Kaplan turbines: Prototype-CFD comparison
title_full Pressure pulsation in Kaplan turbines: Prototype-CFD comparison
title_fullStr Pressure pulsation in Kaplan turbines: Prototype-CFD comparison
title_full_unstemmed Pressure pulsation in Kaplan turbines: Prototype-CFD comparison
title_sort pressure pulsation in kaplan turbines: prototype-cfd comparison
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/83642
work_keys_str_mv AT rivettiarturo pressurepulsationinkaplanturbinesprototypecfdcomparison
AT lucinoceciliaveronica pressurepulsationinkaplanturbinesprototypecfdcomparison
AT lisciasergiooscar pressurepulsationinkaplanturbinesprototypecfdcomparison
AT muguerzad pressurepulsationinkaplanturbinesprototypecfdcomparison
AT avellanfrancois pressurepulsationinkaplanturbinesprototypecfdcomparison
bdutipo_str Repositorios
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