乱流境界層の制御に関する基礎研究 : 曲率流路開始部における圧力急減少の有無の凸曲率乱流境界層への影響

概要

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Turbulent boundary layer characteristics are studied experimentally under two different conditions: with a rapid pressure decrease at the start of the convex surface curvature (CASE I), and without a pressure decrease (CASE II). It is clear that there are distinct differences in the turbulent boundary layer characteristics between the two conditions. The causes of the marked differences are discussed in detail, evaluating the turbulent stress production terms in turbulent stress transport equations. The effect of the pressure decrease in CASE I makes [∂u/∂y] increase rapidly in the region close to the convex surface, which increases the stress production terms. Furthermore, u'^2^^^- increases. The effect of the convex curvature in CASE II reduces the Reynolds stress in the layer under the influence of the [ku] term in the equation. Then the negative region of the stress appears. There are distinct differences between the two conditions with respect to mean velocity characteristics affected by the turbulent characteristics.
一般社団法人日本機械学会の論文
1989-01-25