喷嘴位置对新型环形射流泵性能的影响

运用数值模拟的方法,研究在不同被吸流体速度比下,不同喷嘴位置对采用环形射流喷嘴的新型环形射流泵性能的影响,设计了与传统贴壁环形射流喷嘴不同的夹心式环形射流喷嘴,使得工作流体在离开喷嘴后处于被吸流体的包夹之中.对该新型环形射流泵进行性能预测,并与传统环形射流泵进行对比.数值模拟结果表明：新型环形射流泵效率普遍高于传统环形射流泵效率;对于新型环形射流泵,工作喷嘴位置距离壁面8 mm为最优;对于工作喷嘴距离壁面分别为4,6 mm的新型环形射流泵,在流量比为0.4~0.8的范围内,最佳速度比为1/1,而对于工作喷嘴距离壁面8 mm的新型环形射流泵,在流量比为0.4~0.8的范围内,最佳速度比为3/1.

Effects of nozzle location on new type annular jet pump performance

A numerical simulation method was utilized to explore effects of nozzle location on performance 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.