研究结果表明，由于叶片两侧存在压差，部分流体通过叶顶间隙进入相邻流道形成一股泄露流，这股泄露流以射流形式通过叶顶间隙，与叶片吸力面从流道底部流向流道顶部的二次流以及上壁面分离流体在叶片吸力面角区附近汇聚，泄露流加剧了叶轮上壁面流动分离。分流叶片与主叶片的叶顶泄露流现象类似。三股流体汇聚的位置与熵增区域相重合，说明三股流体汇聚是流道顶部位置产生损失的直接原因。本课题设计的离心压气机叶轮尺寸小，相对叶顶间隙高度大，叶顶泄露流对叶轮的性能产生很大影响，使得叶片吸力面角区成为主要的损失位置。

The research results show that due to the pressure difference between the two sides of the blade, part of the fluid enters the adjacent flow channel through the tip clearance to form a leakage flow. This leakage flow passes through the tip clearance in the form of jet, converges with the secondary flow from the blade suction surface to the top of the flow channel and the upper wall separation fluid near the corner of the blade suction surface, and the leakage flow intensives the flow separation on the upper wall of the impeller. The tip leakage of the diverter blade is similar to that of the main blade. The converging position of the three streams coincides with the area of entropy increase, which indicates that the converging of the three streams is the direct cause of the loss at the top position of the flow channel. The centrifugal compressor impeller designed in this paper has a small size and a large relative tip clearance height. The tip leakage flow has a great influence on the performance of the impeller, making the suction surface Angle area of the blade become the main loss position.