Abstract：In order to study the performance and flow characteristic of multi-nozzle jet pump,the multi-nozzle jet pumps with different structures are designed.The pumps with different structural parameters are simulated numerically using k-ε model and wall functions.The results showed that the number of nozzles,the nozzle angle and the nozzle-to-throat clearance have a great influence on the performance of jet pump,and the turbulent kinetic energy is greater in suction chamber and in inlet of throat.PIV is used to measure the internal flow field of jet pumps with different structures.Velocity vectors and turbulent kinetic energy contours on the symmetry plate of the jet pump are obtained.The results show that the faster the velocity gradient decays,the shorter mixing distances of operating fluid and the drawn liquid are.The multi-nozzle jet pump could shorten the length of throat pipe.The measurement results agree with the numerical simulation.
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