Positive and Negative Performance Analysis of the Bi-Directional Full-Flow Pump with an “S” Shaped Airfoil

In this study, model tests and numerical simulations are conducted to study the bi-directional full-flow pump (BFFP). Firstly, head, efficiency shaft power of BFFP significantly higher in positive operating condition than negative condition. When unit operates direction, clearance reflux flow rate, uniformity velocity-weighted average angle impeller inlet, intensity pressure pulsation greater those during operation. is at low rates, produces a significant disturbance inlet main flow. Two vortices appear near-wall area outlet (i.e., inlet), range larger operation Secondly, low-flow design-flow conditions, total entropy production direction that direction. small- amplitude smaller This will contribute research development pump.