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Harmonic Methods for Unsteady Nozzle-Flows and Detached-Eddy Simulation of Inlet Distortion for a Transonic Rotor

Abstract

The first part of this dissertation explores harmonic methods for both one-dimensional and quasi-one-dimensional flows. The focus is placed on the flow response to oscillating back-pressure for subsonic and transonic conditions. This study includes insight as to the applicability of these methods when resonance of the flow field is expected and estimates of the errors introduced when applying a linearization about a steady-state non-linear flow. The second part explores the unsteady aerodynamics and performance of NASA Rotor 67 when time-varying inlet-distortions are used. A Detached-Eddy Simulation is used to model the flow physics. Within this study, the impact of the inlet distortions are presented based on the unsteady aerodynamics and performance metrics as well as the tonal content of pressure fluctuations within the rotor passage.

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