In order to study the internal flow fields of mixed-flow pump with eccentric impeller, the numerical simulation and experiment have been conducted based on the dynamic sliding multi-region method. During simulation, the impeller domain has been separated by three sub-domains to apply the whirl effect. The pressure, turbulent kinetic dissipation and streamline distribution in the tip clearance were analyzed. The results show that the energy performance of calculation is basically consistent with the experimental results, which indicates the accuracy of energy performance prediction. The efficiency and head at the design flow condition drop about 20% and 11%, respectively, when e = 0.5 mm. The circumferential pressure distribution of impeller inlet and outlet is influenced greatly by the eccentric impeller, but the middle part of impeller suffered little effects as a result of the rotation effect of impeller. When the impeller is eccentric, the tip leakage flow and tip leakage vortex (TLV) are restrained at small tip clearance but enhance at large tip clearance. The angle between the TLV core and blade rim also increases at large tip clearance but decreases at small tip clearance. More energy has dissipated in the first half part of impeller channel within tip region, and the impacting depth increases with the increase in eccentricity, which affect the inlet flow fields of impeller at large eccentricity. The turbulent kinetic dissipation and hydraulic losses increase with the increase in eccentricity, which is the main factor for the decrease in pump efficiency.

为了研究带偏心叶轮的混流泵的内部流场，基于动态滑动多区域法进行了数值模拟和实验。在模拟过程中，叶轮域已被三个子域分隔以应用旋转效果。分析了叶尖间隙中的压力，湍流动力学耗散和流线分布。结果表明，能量性能的计算与实验结果基本一致，表明能量性能预测的准确性。当e 等于0时，设计流量条件下的效率和扬程分别下降约20％和11％。= 0.5毫米。叶轮进，出口的周向压力分布受偏心叶轮的影响很大，但叶轮的中部由于叶轮的旋转作用而受到的影响很小。当叶轮偏心时，叶尖泄漏流和叶尖泄漏涡（TLV）会在较小的叶尖间隙处受到抑制，而在较大的叶尖间隙处会增大。TLV芯和叶片轮缘之间的夹角在大叶尖间隙时也增大，但在小叶尖间隙时减小。叶尖通道内叶轮通道的上半部分耗散了更多的能量，并且冲击深度随着偏心率的增加而增加，从而在较大的偏心率下影响叶轮的入口流场。湍流的动耗和水力损失随着偏心率的增加而增加，