压气机叶栅大攻角分离涡特性分析

Numerical investigation of separation vortex characteristics in compressor cascade with large positive attack angle

叶轮机械叶栅通道内部包含复杂的具有非定常流动特征的涡系结构。这里应用数值仿真手段分析了压气机直列叶栅的非定常流动特性,对二维直列叶栅流场非定常涡系进行了数值模拟分析,捕捉到了分离涡的产生、脱落与耗散过程,分析了其对叶栅性能潜在的影响效应,计算结果合理地反映了叶栅流场非定常紊流流动特征。

There are complex separation vortex which often occurs for unsteady flow in the cascade passage of turbomachine. Unsteady flow characteristic of cascade is analysed in this paper by means of numerical simulation. The numerical analysis have been executed to unsteady vortices characteristics in flow field of two dimensional cascade, and how the vortices are come into being, shedding and its dissipation are captured in theunsteady flow field. The potential effects of vortices to cascade performance are analysed. The calculated results are reasonable to indicate the unsteady turbulent flow characteristics of cascade passage.