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A New Mixing Interface Approach For Turbulent Swirling Flows In Hydraulic Turbines
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Scientific Bulletin of the “Politehnica” University of Timisoara, Transactions on Mechanics, Tom 50(64), pp. 113-120
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ABSTRACT
This paper presents a methodology of augmenting
the evaluation precision of the energetic parameters
of the flow in the hydraulic turbines for numerical
computation with commercial software. More precisely,
in the case of decomposing the complex 3D domain
of the turbine in couple sub-domains computed separately,
the much used technique of transferring the
flow parameters is the mixing interface one. The
problem found in this case is that the mathematical
model influences significantly the conservation of the
energy of the flow when passing through the additional
interface. This paper supplies a method of implementation
for the mixing interface with 3D swirling
flows as those upstream the runner. This consists in
the absolute flow components averaging by using
their fluxes through the interfaces. The presented
method was implemented in C programming language
in order to compute the conditions of flow coupling
of the distributor and the runner with FLUENT 6
commercial software.
As a result of mixing interface implementation we
obtained the discharge conservation (by conservation
of the meridian flow velocity) and also the angular
velocity momentum conservation (by conservation
of the tangential flow velocity on constant radiuses
surfaces). These influences significantly the evaluation
of the hydraulic losses in the turbine. This methodology
gives proper results in the case of distributor-runner
interaction, but also in the case of runner-draft tube
flow coupling.
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| ISSN 1224-6077 |
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2005
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| Turbulent mixing interface, swirling flows, Kaplan turbine, Iron Gates I power plant |
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No file uploaded
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BALINT Daniel
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MUNTEAN Sebastian
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ANTON Ioan
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SUSAN-RESIGA Romeo
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National Journal Article
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http://mh.mec.upt.ro/accord-fluid/workshop2005/docs/13_Balint2.pdf
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Numerical Simulation and Parallel Computing Laboratory
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| Institution: |
UPT
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