采用NUMECA软件对一半开式叶轮内流动情形进行数值模拟,对比3种不同叶顶间隙值的数值模拟结果 ,总结了叶顶间隙大小对该叶轮总体性能的影响,分析了叶顶间隙内的流动情形。模拟结果显示:当叶顶间隙增大时,包括效率在内的叶轮总体性能下降,叶轮内部流动变差。研究结果可为类似的半开式叶轮的设计提供参考依据。 NUMECA software was used to simulate the flow in one half of the open impeller. The numerical simulation results of three different tip clearances were compared. The effect of the tip clearance on the overall performance of the impeller was summarized. The flow in the tip clearance was analyzed. situation. The simulation results show that when the tip clearance increases, the overall performance of the impeller including the efficiency decreases, and the flow in the impeller becomes worse. The research results can provide a reference for the design of similar semi-open impeller.