半开式复合叶轮离心泵不同叶顶间隙的水力特性分析

 针对服务于航天低温循环系统的半开式复合叶轮离心泵效能利用率低的问题，研讨了其内流场在3种不同叶顶间隙下的工作情况。应用ANSYSY-Fluent软件对3种不同叶顶间隙的流场进行三维定常全流场数值模拟，得出3种叶顶间隙对离心泵内流特性的影响规律。通过对实物泵的水力特性试验以及试验结果与数值模拟结果对比分析，得出叶顶间隙是半开式离心泵存在能量损耗原因之一，减小叶顶间隙有利于提高效能利用率，并确认了试验数值模拟的可靠性。

Hydraulic Characteristics Analysis of Centrifugal Pump with Unshrouded Composite Impeller at Different Tip Clearances

To tackle low efficiency in using energy generated by a semi-open compound impeller centrifugal pumps (SOCICPs) that work for low-temperature circulation systems in an aerospace environment, we study how internal flow field of SOCICPs operates under three different impeller tip clearances. Firstly, with help of the software ANSYSY-Fluent, we perform a numerical simulation of the 3D time-invariant whole flow field for flow fields of these three impeller tip clearances, and conclude how different impeller tip clearances affect internal flow characteristics of centrifugal pumps. Next, we test hydraulic properties of real pumps. Finally, we compare the test results with the numerical simulation results, and analyze the comparison. The results show that impeller tip clearance is a factor that contributes to energy loss of SOCICPs, and reducing this clearance can improve energy utilization of these pumps, and the numerical simulation results are proved reliable.