Efficiency of jet pumps

A theoretical analysis and an experimental study on the efficiency of water jet pumps, where water is used for both the primary and secondary flows, a re presented in this paper. The theoretical efficiency equations for such j et pumps were first derived based on one-dimensional formulation, and the t heoretical maximum ideal efficiency of 100% was obtained. An experimental r ig was designed and constructed to conduct the experimental study in which a commercial water jet pump was used. The effects of different area ratios of nozzle to mixing throat as well as different nozzle cross sections, whic h include square and triangular nozzles, on the jet pump performance were t hen investigated. The best nozzle cross section for the jet pump was found to be circular, and for high efficiency, the area ratio was found to be aro und 0.30.