中文摘要：

在离心泵性能数值模拟结果与试验测试结果基本吻合的基础上，对泵平衡孔直径在0-12mm 的范围内，进行泵扬程、效率和轴功率预测，研究泵设计工况下，不同平衡孔直径时，平衡腔内液体压力沿轴向、径向和切向分布规律，以及其对盖板力的影响，并绘制出pfk关系曲线。结果表明：同一流量工况时，平衡孔直径增大到一定值后，轴功率明显增大，效率显著降低，但在大于设计流量工况时，扬程与平衡孔直径无关；同一平衡孔直径下，平衡腔压力沿轴向和切向基本保持不变，压力由泵轴至密封环沿径向增大；在平衡腔内小于平衡孔圆心与泵轴中心垂直距离的半径区域，平衡孔直径越小，压力沿径向越趋近于零，而在平衡腔内大于上述半径区域，平衡孔直径越大，压力沿切向越大；比面积 k ≥2.645时，平衡腔区域盖板力基本平衡。

英文摘要：

Numerical simulations based on CFD had been performed by the IS150-125-315 single-stage single-suction centrifugal pump. The numerical results showed a good agreement with the experimental measurements. The performance,i. e.,head,efficiency and shaft power of pump were studied under five balance hole diameters. For each of the diameter,the spatial distribution law of balance cavity pressure was researched. The influence of holes diameter on shroud force was analyzed and the relation curve p =f（ k） was further drew. The results showed that the head had no relation with balance hole diameter when the flow rate was larger than design flow condition. After balance hole diameter increased to a certain value,shaft power was obviously increased and the efficiency was reduced at the same flow condition.The differential pressure of centrifugal pump without balance holes is larger than that with balance holes at the same massflow. Balance cavity pressure of the holes with the same diameter increased along radial direction from pump shaft to seal ring,while the change of its value was negligible along axial and tangential directions. In the region where the radius was less than the vertical distance between balance holes center and pump shaft center,a smaller diameter of balance cavity made the pressure approach zero. Out of this radius,the pressure increased as the balance hole diameter increased. When k ≥2. 645,the shroud force on the balance cavity almost achieved balance.