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.

中文翻译：

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超音速喷气机中的行波和驻波及其在线性和非线性近似中的相互作用

本文涉及超音速非等压射流初始截面处的气体轨迹曲率对开尔文-亥姆霍兹不稳定性类非平稳扰动特征的影响。结果表明，在存在桶形结构的情况下，会出现纵向结构（带状元素）形式的静态泰勒-戈特勒扰动。对马赫数 M = 1.5 的混合层进行了研究。考虑了通过平稳的 Taylor-Gortler 波放大和抑制 Kelvin-Helmholtz 扰动增长的可能性。在局部平行近似的三波共振相互作用的框架内解决了非线性问题。泵浦波是静止的泰勒-戈特勒波。可以看出，在初始截面，