Analysis of the axial focusing of perturbations in hypersonic tubes
The concentration of steady-state perturbations of the flux field on the symmetry axis in axisymmetrical hypersonic aerodynamic tubes  is analyzed. A description of the increment in the amplitude of the perturbations is presented on the basis of the linear theory. The “critical∝ frequency bounding the frequency spectrum of the focused perturbations is estimated.
KeywordsSymmetry Axis Frequency Spectrum Linear Theory Flux Field Aerodynamic Tube
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