S0505-1-3 壁面せん断流の安定性に対する矩形状分布壁面粗さの影響([S0505-1]乱流遷移(1))

概要

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Effects of distributed rectangular roughness on the traveling wave instability are examined experimentally in plane channel flow. Rectangular roughness elements with the height of 4% of the channel half height are distributed in an equal interval on one of the channel walls. Oblique roughness elements as well as two-dimensional roughness elements are considered. A particular attention is focused on dependency of the streamwise growth of Tollmien-Schlichting (T-S) waves on the oblique angle of roughness elements. The two-dimensional roughness destabilizes the flow as predicted by the linear stability theory. When the roughness elements are slightly oblique to the T-S waves, the destabilizing effect is markedly weakened compared with the two-dimensional roughness.
一般社団法人日本機械学会の論文
2010-09-04