軸流中の回転円筒上の境界層に及ぼす単一突起の影響 : 速度比による乱流くさびの特性の変化

概要

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Results of the measurement of flow properties in the boundary layer on a cylinder rotating in an axial flow in the presence of a single protrusion are presented. A wedge-shaped region of turbulent flow extends downstream with streamwise vortices on either side. Mean and fluctuating velocities are measured at various rotation speeds of the cylinder. The mean velocity profiles become asymmetric with respect to the relative streamline of the main flow passing the protrusion point as the rotation speed becomes high; this asymmetry is presumably due to the Coriolis effect. Representations of the mean velocity distribution on the basis of relative streamline coordinates and polar plots confirm the existence of a pair of streamwise vortices. The profiles of the fluctuating velocities within the turbulent-wedge region suggest the existence of many small streamwise vortices. The effect of the Coriolis force on the streamwise vortices is examined by using the vorticity equation expressed in a rotating coordinate system.
社団法人日本機械学会の論文
1990-05-25