高负荷扩压叶栅三维定常旋涡结构建模研究

Study on Three-Dimensional Steady Vortex Structure in a Highly Loaded Compressor Cascade

关键词:  扩压叶栅  旋涡结构  拓扑分析  二次流

Key words:  Compressor cascade  Vortex structure  Topological analysis  Secondary flow

摘要:

为进一步认识高负荷扩压叶栅内的流动机理和旋涡演变规律，采用经试验校核的数值方法，以具有60°折转角的NACA65-010叶型为研究对象，运用拓扑分析理论，探讨了叶栅流道内马蹄涡、通道涡、集中脱落涡和壁角涡等二次旋涡的生成、演绎与发展。分析认为，在高负荷扩压叶栅中，对流场影响最大的涡系结构为通道涡，通道涡在130%B截面转变为稳定的内旋结构，流道内的壁角涡由通道涡诱导形成，而出口角涡则是在叶片尾缘出口绕流与通道涡的综合作用下形成的，流场出口最终呈现出通道涡与集中脱落涡并存的稳定结构。最后给出了0°冲角下的三维旋涡结构示意图。

Abstract:

For further understanding the flow mechanism and vortex evolution law in a highly loaded compressor cascade，NACA65-010 blade profile with camber angle of 60° was selected. The formation，evolution and development of secondary flow vortices，including horse shoe vortex(HV)，passage vortex(PV)，concentrated shed vortex(CSV)，corner vortex(CV) and so on，were analyzed with the method of topological analysis and numerical simulation. And the numerical method was validated by experimental results. The analysis shows that PV has the most impact on the flow field，and it turns to be stable structure in 130%B section. The CV in the cascade passage are induced by PV，and the CV at outlet is induced by the combined action of PV and reverse flow from pressure surface to suction surface at outlet. Finally，the flow structure in cross section presents a profile of coexistence of PV with CSV. In the end，a vortex structure at incidence of 0° was provided.