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Title: A Numerical Investigation Of The Full 3D Turbulent Flow In Kaplan Hydraulic Turbines
Published In: Scientific Bulletin of the “Politehnica” University of Timisoara, Transactions on Mechanics, Tom 49(63), pp. 59-66
Description: ABSTRACT This paper presents a complete numerical methodology for computing the 3D turbulent flows in Kaplan turbines, methodology which can be easily used in the engineering research. Turbulent simulations for 3D geometries are used mainly for analyzing the energetic characteristics of flow behavior as a second step after the ideal flow simulations. Generally, the flow in the hydraulic turbines is three-dimensional and unsteady; therefore the boundary conditions imposed are significant for reducing the time of the computation and the hardware resources required. The domain of the computation extends from the inlet of the spiral casing to the outlet of the draft tube. In order to reduce the computing time, the domain of investigation is decomposed in sub-domains and a guide vane-runner mixing interface boundary condition is used for obtaining a coupled numerical simulation. The velocity field together with the turbulence parameters is imposed on the inlet surface of each sub-domain, respectively the pressure field and the backflow turbulence parameters are imposed on the outlet surface of the sub-domains. In the mixing interface case, the solution is iteratively computed until continuous velocity and pressure fields are obtained. The whole methodology is applied in case of Kaplan turbines from the Iron Gates I powerplant at variable discharge.
ISSN:ISSN 1224-6077
Publication year: 2004
Keywords:3D full Kaplan turbine, turbulent flows, Iron Gates I powerplant, mixing interface method
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Authors: BALINT Daniel , SUSAN-RESIGA Romeo , MUNTEAN Sebastian , ANTON Ioan ,
Type: National Journal Article
Laboratory: Numerical Simulation and Parallel Computing Laboratory
Institution: UPT