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Swirling Flow Downstream A Francis Turbine Runner
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Scientific Bulletin of the “Politehnica” University of Timisoara, Transactions on Mechanics, Tom 49(63), pp. 159-166
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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.
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| ISSN 1224-6077 |
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2004
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| Francis turbine, swirling flow |
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No file uploaded
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SUSAN-RESIGA Romeo
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CIOCAN Gabriel Dan
,
AVELLAN Francois
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National Journal Article
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http://mmut.mec.upt.ro/mh/Conferinta_MH/218_Resiga.pdf
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Numerical Simulation and Parallel Computing Laboratory
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| Institution: |
UPT
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