后置导叶作为斜流泵的主要过流部件，在改善叶轮出口流场及对斜流泵水力特性影响起着重要作用。为研究不同后置导叶结构对斜流泵水力特性的影响，根据长短导叶位置匹配建立三种复合型导叶结构方案，每种方案分别选取0.6Qd、0.8Qd、1.0Qd、1.2Qd和1.4Qd五个流量工况条件进行CFD数值计算，通过效率、扬程以及内部流场状态的分析，结果显示：不同位置的短导叶结构对水力特性影响较大，设计流量工况下，短导叶在后置导叶流道的进口处流场相对平顺，出口漩涡较小，整体水力性能较好；但偏离设计流量工况下，短导叶在后置导叶流道的出口处的整体水力性能较好。研究结果可为斜流泵导叶结构设计提供参考。

As a main flow component of the Mixed-flow pump,post-guide vane plays an important role in improving the flow field of the impeller and influencing the hydraulic characteristics. In order to study the influence of different post-guide vane structures on the hydraulic characteristics of the mixed-flow pump,three programs are built up according to the matching position of splitter vane,and each type is analyzed in terms of efficiency,lift and internal flow field condition,choosing five flow condition spots,which are 0.6Qd,0.8Qd,1.0Qd,1.2Qdand 1.4Qd with CFD numerical calculations. The results show that the hydraulic characteristics are greatly influenced by different positions of short guide vanes. In designing flow conditions,short guide vane has relatively smooth flow field in the import of the post-guide vane channel, smaller vortex in export and better performance of the whole hydraulic performance. While the condition deviates from the design flow,the whole hydraulic performance is good in the export. The research results can provide a reference for the design of vane structures of mixed-flow pumps.