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- W2312587308 abstract "The propagation of acoustic-vorticity disturbances in an annular swirling flow is examined. The normal mode analysis of the unsteady motion shows that the eigenmodes are characterized as nearlysonic pressure-dominated and nearly-convected vorticity-dominated. Doppler frequency shift enhances the number of non-axisymmetric nearlysonic modes propagating opposite to the mean flow swirl. Nearly-convected eigenvalues are split in two branches and clustered with increasing density as they approach a critical layer. A pseudo-spectral numerical method is complemented by a multiplescale analysis applied to investigate the behavior of nearly-convected solution in the vicinity of the critical layer. Briggs criteria are then used to examine the stability of nearly-convected solutions." @default.
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- W2312587308 date "1997-05-12" @default.
- W2312587308 modified "2023-10-16" @default.
- W2312587308 title "Acoustic-vorticity modes in an annular duct with mean vortical swirling flow" @default.
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- W2312587308 doi "https://doi.org/10.2514/6.1997-1695" @default.
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