A numerical simulation method was utilized to explore effects of nozzle location on perfor-mance of a new type annular jet pump(NTAJP). NTAJP has a newly-designed annular nozzle in which an annular jet is off the pump suction chamber wall and totally immerged in the sucked liquid compared with the conventional annular nozzle that the annular jet is along the chamber wall only. The NTAJP performance was numerically predicted and compared with the conventional pump. Effects of nozzle location on the performance were analyzed under different central suction nozzle-to-outer annular nozzle velocity ratios(vr). It was shown that NTAJP generally has better efficiency than the conventional one. The annular nozzle located at 8 mm away from the suction chamber wall has the best performance. For the NTAJP with the nozzle at 4 mm and 6 mm away from the wall respectively, the best vr is 1/1 when the flow ratio is ranged in 0.4-0.8. For the NTAJP with the nozzle at 8 mm away from the wall, however, the best vr is 3/1 in the same flow ratio range.
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