It is shown after analysis that the efficiency of roto-jet pump is higher than theefficiency of multistage pump and express pump when it operates in the region of low dis-charge and high lift.

• 通过分析得出旋喷泵在小流量和高扬程工况下运行时，效率高于多级泵和高速泵，在研究旋喷泵集流管与叶轮匹配及集流管扩散段损失的基础上，给出了设计扩散管水力参数的公式。