Research Center for Engineering of
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Title: Swirling Flow Downstream A Francis Turbine Runner
Published In: Scientific Bulletin of the “Politehnica” University of Timisoara, Transactions on Mechanics, Tom 49(63), pp. 159-166
Description: ABSTRACT An analytical representation for swirling flow at the Francis runner outlet is built using a superposition of three elementary vortices. The first vortex corresponds to a rigid body rotation, with a constant axial velocity profile. The other two vortices are of Batchelor type: one is counter-rotating and co-flowing, while the other is co-rotating and counter-flowing with respect to the first vortex. The mathematical analysis of this vortex system shows that the swirl reaches a critical state practically at the same discharge value where a sudden variation in the draft tube pressure recovery is experimentally observed. We recommend that when designing a Francis turbine runner one should avoid reaching a critical state for the swirl at the runner outlet within the normal operating range.
ISSN:ISSN 1224-6077
Publication year: 2004
Keywords:Francis turbine, swirling flow
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Authors: SUSAN-RESIGA Romeo , CIOCAN Gabriel Dan , AVELLAN Francois ,
Type: National Journal Article
Laboratory: Numerical Simulation and Parallel Computing Laboratory
Institution: UPT