Department of Mechanical Engineering,Sharif University of Technology
Department of Mechanical Engineering,Clarkson University
Stay and guide vanes (distributor) are essential parts of a turbine. They are used to control
ow rate and to appropriately transfer the
ow momentum to the runner. In this work,
the distributor is analyzed. For various Boundary Conditions (BC) and dierent congurations, threedimensional
ows in the distributor of a Francis turbine are evaluated and compared with each other. The
numerical simulations were carried out using Fluent software and the results were validated with a GAMM
Francis turbine, where the geometry and detailed best eciency measurements were publically available.
In these simulations, the
ow was assumed to be steady and the eect of turbulence was included using
the k ???? " turbulence model. The study showed that an accurate prediction of velocity and pressure elds
through the distributor may be obtained by considering a representative runner chamber with a single
passage, including one blade of a stay and guide vane conguration. Furthermore, the corresponding
needed computational resources for such an analysis are quite modest.