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Analysis of the cavitating draft tube vortex in a Francis turbine using particle image velocimetry measurements in two-phase flow / Monica Sanda Iliescu in Transactions of the ASME . Journal of fluids engineering, Vol. 130 N° 2 (Fevrier 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 2 (Fevrier 2008) . - 10 p. Titre : Analysis of the cavitating draft tube vortex in a Francis turbine using particle image velocimetry measurements in two-phase flow Type de document : texte imprimé Auteurs : Monica Sanda Iliescu, Auteur ; Gabriel Dan Ciocan, Auteur ; François Avellan, Auteur Année de publication : 2009 Article en page(s) : 10 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Particulate  matter;  vortices;  ropes;  Francis  turbines;  flow  (dynamics);  measurement;  cavitation Résumé : Partial flow rate operation of hydroturbines with constant pitch blades causes complex unstable cavitating flow in the diffuser cone. A particle image velocimetry (PIV) system allows investigating the flow velocity field in the case of a developing cavitation vortex, the so-called vortex rope, at the outlet of a Francis turbine runner. The synchronization of the PIV flow survey with the rope precession allows applying the ensemble averaging by phase technique to extract both the periodic velocity components and the rope shape. The influence of the turbine setting level on the volume of the cavity rope and its centerline is investigated, providing a physical knowledge about the hydrodynamic complex phenomena involved in the development of the cavitation rope in Francis turbine operating regimes. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Analysis of the cavitating draft tube vortex in a Francis turbine using particle image velocimetry measurements in two-phase flow [texte imprimé] / Monica Sanda Iliescu, Auteur ; Gabriel Dan Ciocan, Auteur ; François Avellan, Auteur . - 2009 . - 10 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 2 (Fevrier 2008) . - 10 p. Mots-clés : Particulate  matter;  vortices;  ropes;  Francis  turbines;  flow  (dynamics);  measurement;  cavitation Résumé : Partial flow rate operation of hydroturbines with constant pitch blades causes complex unstable cavitating flow in the diffuser cone. A particle image velocimetry (PIV) system allows investigating the flow velocity field in the case of a developing cavitation vortex, the so-called vortex rope, at the outlet of a Francis turbine runner. The synchronization of the PIV flow survey with the rope precession allows applying the ensemble averaging by phase technique to extract both the periodic velocity components and the rope shape. The influence of the turbine setting level on the volume of the cavity rope and its centerline is investigated, providing a physical knowledge about the hydrodynamic complex phenomena involved in the development of the cavitation rope in Francis turbine operating regimes. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]