The simulation of cavitation flow is sensitive to the turbulence model and cavitation model. To improve the accuracy of numerical simulation, a centrifugal pump with specific speed of 56.5 is taken as the research object, and the Filter-Based Model (FBM) was used to correct the RNG turbulence model. Zwart-Gerber-Belamri (ZBG) cavitation model, Kunz model and Schnerr-Sauer model were employed for the simulation of cavitation flow in a centrifugal pump. According to the comparison, the results calculated by the ZGB model were 8% closer to the experimental results in cavitation predictions. The cavitation occurs around the impeller ring and balance holes firstly, and then the vapor develops and cover 80% of the blade suction side. By using Q-criterion, the distribution of the vortex core region under different cavitation conditions were investigated. The volume of high intensity vortex under severe cavitation condition is 30%∼50% higher than that under other conditions. Furthermore, the distribution of the radial force of the impeller corresponds to the number of blades, and the cavitation affects the resultant force direction of the impeller. With the intensification of cavitation, the radial force of impeller increases gradually, and the regularity of radial force direction will be disorder.

空化流动的模拟对湍流模型和空化模型很敏感。为提高数值模拟的精度，以比转速为56.5的离心泵为研究对象，采用基于滤波器的模型（FBM）对RNG湍流模型进行修正。Zwart-Gerber-Belamri (ZBG) 空化模型、Kunz 模型和 Schnerr-Sauer 模型用于模拟离心泵中的空化流动。根据比较，ZGB模型计算的结果与空化预测的实验结果接近8%。气蚀首先发生在叶轮环和平衡孔周围，然后蒸汽发展并覆盖叶片吸力侧的 80%。通过使用Q-准则，研究了不同空化条件下涡核区域的分布。严重空化条件下的高强度涡流体积比其他条件下高30%～50%。此外，叶轮径向力的分布与叶片的数量相对应，空化影响叶轮的合力方向。随着汽蚀的加剧，叶轮的径向力逐渐增大，径向力方向的规律性将变得无序。