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Authors
Shubin, K. V.
Chuvakhov, P. V.
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Article History
Received: 28 September 2022
Revised: 20 February 2023
Accepted: 28 February 2023
First Online: 26 January 2024
CONFLICT OF INTEREST
: The authors of this work declare that they have no conflicts of interest.
: The evolution of small perturbations of the second mode of the flat-plate supersonic boundary layer is numerically simulated at the Mach number equal to 5. These perturbations are excited by a plane monochromatic slow acoustic wave with a fixed inclination of wavefronts.The spectral characteristics of disturbances are analyzed. It is shown that everywhere in the boundary layer the linear mode of development of disturbances is preserved, that is, the disturbance frequency is constant and corresponds to the incident wave frequency. The incident wave interferes with the excited modes, causing stationary amplitude modulation of pressure perturbations on the plate surface.Amplitude modulation can be considered as a transfer function that makes it possible to restore the characteristics of the external acoustic field by measuring the amplitude-frequency spectra of disturbances at several points on the plate surface.The development of the proposed method in the case of external acoustic noise from an axisymmetric source surface, which is typical for WT conditions, requires further investigations.
