To study the effect of sediment on the cavitation in the axial-flow pump, the method of CFD is employed to experiment on the internal flow field of the pump in the case of cavitation in clean water and sandy water separately. The calculation is done with different particle sizes and sediment concentrations. The results show that as the sediment concentration increases, the vortex range and cavitation area of the blade will further increase, and the flow pattern in the impeller becomes more disordered. The mechanism of action of particle size on cavitation is similar to that of sediment concentration. However, cavitation in clean water is quite different from that in sandy water in that the cavitation value and range in sandy water are significantly larger than that in clean water. By contrast, the particle size has little effect on the cavitation value and range. It proves that particle size does not have a great influence on cavitation distribution, but sediment concentration is the main factor affecting the cavitation performance of the pump. Moreover, sediment will disrupt the internal flow pattern of the pump, promote the development of cavitation and further reduce the cavitation performance of the pump.

为研究泥沙对轴流泵空化的影响，分别采用CFD方法对清水和砂水中空化情况下的泵内部流场进行实验。计算是用不同的颗粒大小和沉积物浓度完成的。结果表明，随着含沙量的增加，叶片的涡旋范围和空化面积将进一步增大，叶轮内的流型变得更加紊乱。粒径对空化作用的机理与沉积物浓度的作用机理相似。但是，清水中的气蚀与砂水的气蚀有很大不同，砂水中的气穴值和范围明显大于清水中的气蚀值和范围。相比之下，粒径对空化值和范围影响不大。证明粒径对空化分布影响不大，但泥沙浓度是影响泵空化性能的主要因素。而且，泥沙会扰乱泵的内部流动模式，促进汽蚀的发展，进一步降低泵的汽蚀性能。