Abstract
In the case of the perturbation analysis of nonlinear acoustics, it is customary to assume that the underlying undisturbed mean flow is uniform or nonexistent. When this assumption is removed, several interesting phenomena occur, which are of considerable practical significance. In this paper, three kinds of mean flow nonuniformities are analyzed. These are shear flows, axial gradients, and mean flows with nonzero divergence. It has been shown that these cases lead to sound attenuation, amplification, and instabilities, as well as the generation of fluctuating vorticity and the acousto-vortical waves.
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