This paper describes the analysis of the flowfield in a four-stage low-speed axial compressor at the design point investigated both numerically and experimentally, with particular emphasis on the impact of stator hub flow leakage in a section of the machine featuring a change of stator configuration. The goal of the work is to give insight into the effect of the stator hub configuration on the aerodynamic performance in terms of loss and efficiency of downstream blade rows as well as the resulting stage matching effects. The investigation is focused on aerodynamic behavior and stage interaction, which the stator hub configuration of a given stage induces in a downstream stage with respect to its performance and flowfield. Two shrouded and one cantilevered stator hub configurations, such as those commonly employed in industry, are investigated and discussed with respect to local flow phenomena and stagewise aerodynamic effects. The results show that the stator hub configuration of a given stage has a drastically high impact on the downstream rotor aerodynamic performance, whereas the downstream stator as well as the upstream rotor are only slightly influenced by the stator hub configuration.

本文描述了在设计阶段对四级低速轴流式压缩机的流场进行数值和实验研究的分析，特别强调了定子轮毂泄漏对机器部分定子变化的部分的影响。组态。该工作的目的是根据下游叶片排的损失和效率以及由此产生的级匹配效应，深入了解定子轮毂配置对空气动力学性能的影响。研究集中于空气动力学行为和级间相互作用，这是给定级的定子轮毂配置在其性能和流场方面在下游级中引起的。两罩和一悬臂式定子轮毂配置，例如工业上常用的配置，就局部流动现象和阶段性空气动力学效应进行了研究和讨论。结果表明，给定级的定子轮毂配置对下游转子的空气动力学性能具有极大的影响，而下游定子和上游转子仅受到定子轮毂配置的轻微影响。