提出在普通转速离心泵的入口处或高速离心泵的前置诱导轮前增加引射装置来提高泵的汽蚀性能 ,给出单孔喷嘴轴向直引射和环形多喷嘴轴向斜引射两种引射装置的结构示意图 .探讨了引射装置设计的理论基础及优化设计的目标 ,指出采用引射装置是提高泵汽蚀性能的新方法 It is proposed to increase the cavitation performance of the pump by adding an ejector at the inlet of the ordinary speed centrifugal pump or before the pre-induction wheel of the high-speed centrifugal pump. The axial direct injection of the single-hole nozzle and the axial oblique injection of the annular multi-nozzle are given Schematic diagram of the structure of two kinds of ejector device.The theoretical basis of design of ejector device and the goal of optimal design are discussed.The author points out that using ejector device is a new method to improve cavitation performance of pump