Abstract
AbstractThe presence of Tollmien‐Schlichting waves during the initial stages of the isothermal mixing of two axi‐symmetical laminar streams of air has been confirmed by comparing data from hot wire measurements with published two‐dimensional theoretical and experimental results for the stability of mixing and for transition in a boundary layer. Hot wire measurements in the flow field of steady or vibrating axi‐symmetrical laminar diffusion flames are remarkably similar to those obtained during isothermal mixing. A travelling wave in the mean flow direction has also been established. Data for these flames agree with the results of a higher order stability analysis for natural convection flow past a vertical heated plate. It has been concluded that Tollmien‐Schlichting waves are responsible for exciting flame vibrations.
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