Abstract
In this paper, turbulent flow fields in a multi-stage transonic axial compressor have been investigated using large-scale detached eddy simulation (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. Ensemble averaging was performed on the obtained numerical results using the phase-locked averaging method to quantitatively investigate the unsteady state of the interaction between the inlet guide vane (IGV) and the first-stage rotor blade. As a result, the wake interference was confirmed. Periodic fluctuations of the flow field around the IGV occurred with the same period as the blade passing of the first-stage rotor, indicating that the flow field fluctuates due to the potential interference with the first-stage rotor blade.
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