遷音速多段軸流圧縮機における静翼列流れのLES解析

抄録

In this paper, the turbulent flow field in a stator cascade of a multi-stage transonic axial compressor have been investigated using large-scale unsteady simulation including LES and DES analysis. The flow field was analyzed by data mining techniques including vortex identification based on the critical point theory and topological data analysis of the limiting streamline pattern visualized by the line integral convolution (LIC) method. It is found that hub-corner separation occurs in the first stator and interacts with the shock wave from the second rotor and the wake from the first rotor. Although only one hub-corner separation vortex is formed in the time-averaged flow field, hub-corner separation vortex is generated in multiple pieces in an instantaneous flow field and those pieces fluctuate with time violently, distorting the near-hub flow.