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.
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e-mail: msiliescu@yahoo.fr
e-mail: gabrieldan.ciocan@orange.fr
e-mail: francois.avellan@epfl.ch
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February 2008
Research Papers
Analysis of the Cavitating Draft Tube Vortex in a Francis Turbine Using Particle Image Velocimetry Measurements in Two-Phase Flow
Monica Sanda Iliescu,
Monica Sanda Iliescu
Dr. Ing.
Laboratory for Hydraulic Machines,
e-mail: msiliescu@yahoo.fr
Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Avenue de Cour 33bis, CH-1007 Lausanne, Switzerland
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Gabriel Dan Ciocan,
Gabriel Dan Ciocan
Dr. Ing.
Laboratory for Hydraulic Machines,
e-mail: gabrieldan.ciocan@orange.fr
Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Avenue de Cour 33bis, CH-1007 Lausanne, Switzerland
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François Avellan
François Avellan
Dr. Ing.
Laboratory for Hydraulic Machines,
e-mail: francois.avellan@epfl.ch
Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Avenue de Cour 33bis, CH-1007 Lausanne, Switzerland
Search for other works by this author on:
Monica Sanda Iliescu
Dr. Ing.
Laboratory for Hydraulic Machines,
Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Avenue de Cour 33bis, CH-1007 Lausanne, Switzerlande-mail: msiliescu@yahoo.fr
Gabriel Dan Ciocan
Dr. Ing.
Laboratory for Hydraulic Machines,
Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Avenue de Cour 33bis, CH-1007 Lausanne, Switzerlande-mail: gabrieldan.ciocan@orange.fr
François Avellan
Dr. Ing.
Laboratory for Hydraulic Machines,
Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Avenue de Cour 33bis, CH-1007 Lausanne, Switzerlande-mail: francois.avellan@epfl.ch
J. Fluids Eng. Feb 2008, 130(2): 021105 (10 pages)
Published Online: January 25, 2008
Article history
Received:
June 29, 2006
Revised:
July 1, 2007
Published:
January 25, 2008
Citation
Iliescu, M. S., Ciocan, G. D., and Avellan, F. (January 25, 2008). "Analysis of the Cavitating Draft Tube Vortex in a Francis Turbine Using Particle Image Velocimetry Measurements in Two-Phase Flow." ASME. J. Fluids Eng. February 2008; 130(2): 021105. https://doi.org/10.1115/1.2813052
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