LAUSR

This paper touches upon the influence of the curvature of a gas trajectory at the initial section of a supersonic nonisobaric jet on the features of nonstationary perturbations from the Kelvin–Helmholtz instability class. It is shown that, in the presence of a barrel-shaped structure, stationary Taylor–Gortler perturbations in the form of longitudinal structures (banded elements) arise. Studies for a mixing layer with a Mach number M = 1.5 are carried out. The possibility of amplifying and suppressing the growth of Kelvin–Helmholtz perturbations by stationary Taylor–Gortler waves is considered. A nonlinear problem is solved within the framework of three-wave resonance interactions in a local-parallel approximation. A pumping wave is a stationary Taylor–Gortler wave. It is shown that, at the initial section, small-amplitude traveling waves can be both amplified and suppressed.