軸流中の細長回転円筒上の乱流境界層の実験 (平均流と乱れの特性)

概要

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The mean velocity and turbulent field in a three-dimensional turbulent boundary layer on a thin cylinder rotating in a uniform stream are examined experimentally. Measurements of mean velocity and all Reynolds stresses are made by means of a single rotatable hot-wire method. Mean velocity distribution is well represented in the relative main flow direction with respect to the rotating cylinder by a logarithmic law deduced in an earlier study. Although turbulent intensities and Reynoldsstresses all increased with rotation speed of the cylinder, their distributions are well represented by non-dimensionalization using the resultant velocity of the main flow and the peripheral velocity of the cylinder. Both eddy viscosities and mixing lengths increase with the rotation speed, and there is no evidence of isotropic eddy viscosity.
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