INVESTIGATION OF THE LAMINAR–TURBULENT TRANSITION WITH THE USE OF A HOT-WIRE FILM SENSOR

The laminar–turbulent transition in transonic flows is studied with the use of hot-wire thin-film surface sensors. For determining fluctuations recorded by the film sensor in the boundary layer, coherence spectra are constructed between the data obtained by the film sensor 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 sensor in the intermittency region.