Abstract
The acoustic power flux that occurs in an ideal waveguide in the presence of two modes propagating in it is considered. Singular points of the saddle and vortex types are found for modes of different numbers. The regions lying near the vortex-type points and characterized by the inverse direction of the power flux (i.e., from the receiver to the source) are determined. When a low-number mode propagates together with a higher-number one, the regions, where the power flux noticeably deviates from the general propagation direction, occupy a considerable part of the longitudinal section area of the waveguide.
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