Thrust disk as auxiliary impeller has a vital effect on the big power pump unit with wet motor. It can balance the axial force of the unit, provide power for internal cooling circulation circuit of motor, and further reduce the axial length of the unit. Due to the motor chamber space is limited, and the transmission medium is liquid which needs to consider the effect of cavitation, the research of thrust disk of auxiliary impeller is different from the previous studies of rotating channel. In this paper, the hydraulic performance and cavitation characteristics of thrust disk as auxiliary impeller are investigated experimentally under different conditions. A thrust disk test rig was established to obtain data under different rotation speeds and flow points. Three types of volutes with different outlet angles were designed to match the thrust disk as auxiliary impeller in experiments. Results indicate that the law of speed proportion for the traditional centrifugal pump is not applicable to the head of thrust disk as auxiliary impeller. In addition, the flow coverage increases slightly with rotation speed. Furthermore, the higher the speed is, the larger the NPSHs is, and the narrower the range of NPSH is. Besides, the smaller the outlet angle is, the higher the head of the thrust disk as auxiliary impeller is, the worse anti-cavitation performance is. The research could provide reference and guidance for the design of thrust disk as auxiliary impeller.

推力盘作为辅助叶轮，对湿式电机的大功率水泵机组有着至关重要的作用。可平衡机组轴向力，为电机内部冷却循环回路提供动力，进一步缩短机组轴向长度。由于电机腔空间有限，且传输介质为液体，需要考虑空化效应，副叶轮推力盘的研究不同于以往对旋转通道的研究。本文对作为辅助叶轮的推力盘在不同工况下的水力性能和汽蚀特性进行了实验研究。建立了推力盘试验台，以获取不同转速和流点下的数据。设计了三种不同出口角度的蜗壳，以配合推力盘作为实验中的辅助叶轮。结果表明，传统离心泵的速度比例定律不适用于作为辅助叶轮的推力盘头部。此外，流动覆盖率随转速略有增加。此外，速度越高，越大NPSH s是，和较窄的范围NPSH是。此外，出口角越小，作为辅助叶轮的推力盘扬程越高，抗气蚀性能越差。该研究可为作为辅助叶轮的推力盘设计提供参考和指导。