Numerical Research of Pump-as-Turbine Performance with Synergy Analysis

The wide use of pumps and turbines has significant value in energy conservation utilization. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model one-dimensional theoretical Pump as Turbine (PAT) were established. On basis, the correlation between pressure velocity was quantitatively investigated by proposed sensitivity index (SPV). A synergy field analysis then applied to evaluate flow characteristics pump PAT, providing perspective from mechanism transfer enhancement for hydraulic devices. Moreover, performances PAT studied under various operating conditions. results show that minimum SPV is obtained impeller. With increasing rate, generally increases, angle impeller surface increases well. strong disordered observed regions blade leading edge, trailing volute tongue. variations efficiency head with rate showed similar trends, respectively, outlet mid-plane. This study provides an analytical method quantitative evaluation characteristics, it supplies basis further design improvement PAT.