Numerical investigation of a high head Francis turbine under steady operating conditions using foam-extend

Francis-99 Workshop 1: steady operation of Francis turbines

Lenarcic, M.^1 ; Eichhorn, M.^1 ; Schoder, S.J.^1 ; Bauer, Ch^1

Institute for Energy Systems and Thermodynamics, Vienna University of Technology, Getreidemarkt 9, Vienna

1060, Austria^1

关键词: Best efficiency point;    Computational domains;    Discretization errors;    Incompressible turbulent flow;    Numerical flow simulations;    Numerical investigations;    SST turbulence models;    Steady operating conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/579/1/012008/pdf
DOI  :  10.1088/1742-6596/579/1/012008

来源: IOP

【 摘 要 】

In this work the incompressible turbulent flow in a high head Francis turbine under steady operating conditions is investigated using the open source CFD software package FOAM-extend- 3.1. By varying computational domains (cyclic model, full model), coupling methods between stationary and rotating frames (mixing-plane, frozen-rotor) and turbulence models (kω-SST, varepsilon), numerical flow simulations are performed at the best efficiency point as well as at operating points in part load and high load. The discretization is adjusted according the y+-criterion with y+mean > 30. A grid independence study quantifies the discretization error and the corresponding computational costs for the appropriate simulations, reaching a GCI