Experimental study of pump characteriscics of contra-rotating axial flow pump

摘要

This paper describes the design concepts and an experimental investigation of the contra-rotating axial flow pump, consisting of front and rear rotors instead of a rear stator of conventional type and rotating in opposite directions each other, for improving of pump performances in the range of higher specific speed. The pump performance and radial distributions of flow at the up- and downstream sections of rotors and stator are compared between the contra-rotating and conventional axial flow pumps. Experimental results show that using contra-rotating type is an efficiency means of recovering the swirl kinetic energy without the use of stator and a means with wider range of high efficiency. it is also demonstrated that the reverse flow and cavitation inception could be postponed in the contra-rotating axial flow pump as compared with the conventional type.