Research Center for Engineering of
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Title: A New Mixing Interface Approach For Turbulent Swirling Flows In Hydraulic Turbines
Published In: Scientific Bulletin of the “Politehnica” University of Timisoara, Transactions on Mechanics, Tom 50(64), pp. 113-120
Description: 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.
ISSN:ISSN 1224-6077
Publication year: 2005
Keywords:Turbulent mixing interface, swirling flows, Kaplan turbine, Iron Gates I power plant
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Authors: BALINT Daniel , MUNTEAN Sebastian , ANTON Ioan , SUSAN-RESIGA Romeo ,
Type: National Journal Article
Laboratory: Numerical Simulation and Parallel Computing Laboratory
Institution: UPT