0427 Partial flow characteristics of contra-rotating axial flow pump with reduced speed rear rotor design

Abstract

The contra-rotating axial flow pump with two rotors rotating reversely, had been proved with remarkable performance benefits as well as the significant interaction between blade rows in the our previous experiments. A new type of rear rotor, aiming at the reduction of blade rows interaction and the secondary flow suppression, showed the favorable performance both in EFD and CFD method at the design condition, while an unfavorable positive slope was found on the performance curve in the partial flow rate range. In the present research, to further understand the mechanism of the positive slope, internal flow fields of contra-rotating rotors at partial flow rates were fully investigated by means of experimental measurements and numerical simulations.