Influence of Weak Compressibility on the Hydrodynamic Performance Evaluation of Pump Turbines in the Pump Mode

In general, weak compressibility is one of the properties liquids. That is, in actual operation hydraulic machinery, flow weakly compressible. However, influence often neglected usual numerical simulation, which makes simulation results different from experimental results. Based on Computational Fluid Dynamics (CFD) solver and model test rig, by means mutual verification between experiment, fitting degree before after considering compared analyzed this paper; it obtained that closer to compressibility. addition, velocity field pump turbines, head loss main components, change entropy yield are reasons for value being fluid summarized analyzed. It proved consideration great significance improve accuracy turbines.