抄録
Merged spots were visualized by a smoke-wire method to clarify interaction phenomena between turbulent spots in a zero pressure gradient laminar boundary layer. The turbulent spots were generated by issuing small air jets from the two holes horizontally displaced at 40mm on a flat plate. The merged spots conformed almost the same outline as the superposition of the individual spots. Inside of the single spot was composed of many small vortices and their number increased around its wing-tip as the spot was convected downstream. When the spots generated in parallel began to merge, the hight of the merged part was enhanced than that of each isolated spot through their mutual interaction then, strong transvers vortices became induced at about Y/δ=1.8 above the merged part in the merged spots. In case of the two spots being generated with phase lag, apparent normal growth was not observed.
