0428 Blade rows interaction of contra-rotating axial flow pump with reduced speed rear rotor design

Abstract

An application of contra-rotating rotors to axial flow pump is effective downsizing the pump system. On the other hand, it might cause a significant blade rows interaction between two rotors. Therefore, it should be clarified for stable operation of pump system. This paper presents an experimental investigation of blade rows interaction by casing wall static pressure measurement of a contra-rotating axial flow pump, whose rear rotor has been designed by low speed design method. From the results, the pressure field in the front rotor is found to be significantly influenced by the rear rotor and the flow field of front rotor changes due to the pressure interaction.