中文摘要：

潜水搅拌器叶片间隙对搅拌效果有重要影响，是影响流场的一个重要参数。通过CFX软件对不同叶片间隙潜水搅拌器流场进行数值模拟，得到了内部流场图、整个流场图以及外特性参数。对不同叶片间隙潜水搅拌器外特性参数进行分析的结果表明，轴功率和出口流量不受叶片间隙的影响。潜水搅拌器的轴推力与搅拌效果呈正相关。随着叶片间隙的增加，有效搅拌比先增加后减小，最佳叶片间隙值为6mm，对应的有效搅拌比为84．7％，单位有效能耗为18．0w。

英文摘要：

The gap between blades has an important influence on the mixing effect of the submersi- ble mixer, and it is an important parameter influencing the flow field. The flow field of the submersible mixer with different blade gaps was stimulated using CFX software. The internal flow field, the whole flow field and the external characteristic parameters of the submersible mixer were obtained. The external characteristic parameters of the submersible mixer with different blade gaps were analyzed, and the results showed that the axial power and the outlet flow rate were not affected by the blade gap. The axial thrust of the submersible mixer showed a positive correlation with the mixing effect. With the increase of blade gap, the effective mixing ratio increased first and then decreased. The optimal blade gap was 6 mm, the effective mixing ratio was 84.7%, and the effective energy consumption per unit was 18.0 W.