CFD Analysis of Middle Stage of Multistage Pump Operating in Turbine Regime

This work deals with the CFD analysis of flow in the middle stage of the radial-flow multistage pump operating in turbine regime. The pump specific speed nq is equal to 23. Two complete stages are analysed with fully unsteady simulation to avoid the influence of boundary conditions and the position of rotor and stator parts on the results. The ANSYS CFX commercial CFD package is used to solve the three-dimensional Reynolds-averaged Navier-Stokes equations using Menter's SST turbulence model.