The receptivity of three-dimensional roughness element on a flat-plate boundary layer to outer acoustic disturbances is investigated by wind-tunnel experiments. As a first step towards the final goal to control the three-dimensionalizing process of T-S (Tollmien-Schlichting) waves, the property of oblique waves, which appear in the later stage of transition, is studied. It is shown that oblique waves can be generated on a flat-plate boundary layer with inclined roughness element under acoustic forcing.
斜行T-S波を励起する試み
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