# Unsteady aerodynamics in an axial flow compressor

Hughes, JD 2001 , 'Unsteady aerodynamics in an axial flow compressor', PhD thesis, University of Tasmania.

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## Abstract

Subsequent collaborative work (not reported within) evaluated the quasi-steady application of conventional transition correlation to predict unsteady transition onset on the blading of an embedded axial compressor stage. The viscous/inviscid interaction code MISES was used to calculate the blade surface pressure distributions and boundary layer development. Predictions of the temporal variation in transition onset based on the measured temporal variation of inflow turbulence were compared with the transition onset observations from the compressor stator. Computations for both natural and bypass transition modes indicated that the natural transition mode predicted by a modified e$$^n$$ method tended to dominate on the compressor blades. The success of the MISES transition onset predictions provided strong circumstantial evidence for the importance of natural transition mechanisms in strongly decelerating flow and provided the impetus further experimental investigation.