Analysis of the Effects of Pre-whirl on the Efficiency and Operating Range of Hydro Pumps used in Pumped Storage Facilities

This paper discusses the application of computational fluid dynamics (CFD) to a case study of a hydraulic pump turbine operating in pumping mode. Emphasis is on the effects of induced pre-whirl on flow patterns through the impeller and on pump performance. ANSYS R Fluent, Academic Research, Release 14.0, software is used to model three-dimensional (3D) Reynolds-averaged Navier-Stokes (RANS) equations with a k − ω SST turbulence model. Full-wheel fixed rotor simulations are used to identify operating parameters that are used in more computationally intensive full-wheel moving mesh simulations.