Investigation of the laminar-turbulent transition with the use of a surface hot-wire probe

The laminar–turbulent transition in transonic flows is studied with the use of thin-film surface hot-wire probes. For determining oscillations recorded by the thin-film probe in the boundary layer, coherence spectra are constructed between the data obtained by the thin-film probe and by the hot-wire probe, which was used to perform measurements across the entire boundary layer. Based on the analysis of these spectra, it is demonstrated that the most accurate and complete data are obtained by the thin-film probe in the intermittency region.