Reduced Numerical Modeling of a High Head Francis Turbine Draft Tube at Part Load

In the present study, a reduced model of Francis-99 turbine was investigated numerically at part load operating condition. The consists standalone draft tube domain turbine. Numerical studies performed in past on nearly complete hydro-turbine models (inclusive spiral casing, distributor domains, runner, and tube) reportedly consist large number computational grids. This may increase costs data storage required to perform numerical analysis, which could be setback for future research new design concepts optimization study domain. developed by mapping phase averaged axial, radial, tangential velocity profiles from runner exit inlet Additionally, turbulent kinetic energy (k) eddy dissipation (ε) variables were also considered better flow prediction inside Two methods boundary conditions study. first method, entire planar profile runner-draft interface considered. second along radial with an axis-symmetric assumption over plane. results obtained validated against NVKS (with available structured mesh) that analysed using passage technique experimental results. found reasonable agreement, each other. useful mitigation rotating vortex rope modifying