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Stall Inception Analysis Of A Transonic Compressor Based On A Global Stability Method

A general form of the eigenvalue-based model for flow instability analysis is firstly introduced. It is simplified and applied to two sorts of classical flows: Poiseuille flow and Couette flow. The spectrums of eigenvalues show good agreements with the well-recognized references. Then, the model is used to predict the stall inception of the transonic axial compressor NASA Rotor 37. The multiple spectrums derived from eigenvalues are compared with the Fourier analysis of the full-passage unsteady flow field. It is found that the small disturbance responsible for the stall inception is well predicted by the global stability method.