The constant temperature hot-film technique has been used to investigate the transition region on a modified flat plate and a large two-dimensional wing. Time histories and r.m.s. values of the output signals together with the power spectral density (PSD) clearly indicate the build up of energy associated with the development of Tollmien–Schlichting waves prior to the onset of transition. A large increase in the low-frequency energy content of the spectrum occurs at the onset of transition. Measurements of skin friction through the transition region have been obtained based on the mean heat loss of the hot film.
The Use of Hot Films for Investigation of Boundary-Layer Transition
1993-07-01
6 pages
Article (Journal)
Electronic Resource
English
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