In this paper, the influence of the specific area of balancing hole on the cavitation performance of high-speed centrifugal pump is studied by numerical method. The results show that in the initial cavitation stage, with the increase of the specific area, the head and efficiency of the pump decreases, and the shaft power increases in a small range. The specific area of the balance hole can change the magnitude and direction of the rotor axial force. With the increase of the specific area, the anti-cavitation performance of the pump is weakened, especially when the specific area reaches a certain value, the vortex flow appears in the balance hole, which causes serious distortion of the flow condition at the inlet of the centrifugal impeller. Meanwhile, cavitation also occurs in the balance chamber and is mainly concentrated near the hub of the centrifugal impeller.

本文采用数值方法研究了平衡孔比面积对高速离心泵空化性能的影响。结果表明，在汽蚀初期，随着比表面积的增加，泵的扬程和效率降低，轴功率在较小范围内增大。平衡孔的比表面积可以改变转子轴向力的大小和方向。随着比表面积的增加，泵的抗气蚀性能减弱，特别是当比表面积达到一定值时，在平衡孔中会出现涡流，这会导致泵进口处的流态严重变形。离心式叶轮。与此同时，