Theory and Performance of Water Jet Pump

by Y.R. Reddy,
Subir Kar,

Serial Information: Journal of the Hydraulics Division, 1968, Vol. 94, Issue 5, Pg. 1261-1282

Document Type: Journal Paper


The theoretical maximum ideal pumping efficiency of a water jet pump is 50% at a flow ratio of unity. Pump performance can be predicted theoretically. With a pump designed with theoretically obtained optimum dimensions, a maximum efficiency of 39.8% was achieved. Efficiencies on the order of 42% could be obtained by selecting proper materials to reduce friction losses to a minimum. If a jet pump with fixed nozzle is constructed for maximum efficiency, the area ratio should be between 0.33 to 0.543; for adjustable nozzle pumps, the area ratio should be about 0.205, and the pump should be operated at a nozzle distance of one to two nozzle diameters.

Subject Headings: Water management | Jets (fluid) | Pumps | Water conservation | Water flow | Friction

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