レイノルズ数Reが10^3〜10^4の突然出発する円柱まわりの流れの非定常はく離 : 第1報,Re=1200と9000の場合の境界層の構造

概要

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Unsteady flows near the surface of a circular cylinder which is started impulsively at the Reynolds number Re=1 200 and 9 000 were investigated by flow visualization techniques. Measurements were performed on the details of the velocity profile in the boundary layer near the separation points to clarify the mechanisms of the occurrence of unsteady separation. When Re=1 200, no singular phenomenon in the boundary layer could be observed even after the time of the appearance of a singular point of the boundary layer equation, which has been suggested from some recent theoretical studies. When Re=9 000, some singular phenomena in the boundary layer are observed a little after the time of the appearance of the singular point suggested by the theoretical studies. Both at Re=1 200 and 9 000, the criterion on the unsteady separation proposed by Taneda indicates nearly the same separation points as that of Wang's criterion.
社団法人日本機械学会の論文
1988-09-25