主流中におかれた円柱後流の乱れによる平板境界層の乱流遷移 : 流れの概観とストリーク構造の発生について

概要

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The boundary layer transition caused by the disturbance generated by a circular cylinder placed in the free stream is experimentally investigated. The cylinder is located dwnstream of the leading edge where the Reynolds number is above the critical value, although the boundary layer is laminar to this point. The distance between the cylinder and the wall is chosen so that the cylinder wake gradually merges with the boundary layer downstream. In contrast to the case of small free-stream disturbance, the transition process in this case starts with the appearance of "streaks." For large cylinder-wall distances, the streaks are followed by turbulent spots, while for the small distances, they directly generate turbulence downstream. A geometrical parameter is newly defined, with which the spanwise spacings of the streaks are correlated, and the observed flow patterns are easily classified.
社団法人日本機械学会の論文
1993-09-25