層流境界層内にある円柱からの渦放出

概要

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The vortex shedding from a circular cylinder in a laminar boundary layer has been investigated experimentally. The circular cylinder was placed at various distances from a flate plate. Experiments were carried out under the Reynolds number less than 10^3. The frequency (f) of the vortex shedding from the circular cylinder is proportional to the velocity (u_c) which is velocity at the center of the circular cylinder in case without the cylinder. This means that, at higher Reynolds number, the Strouhal number is constant as is in the uniform stream. This constant Strouhal number depend on the combination of the cylinder diameter and the gap between the cylinder and the wall, but it does not depend on the Reynolds number and the boundary layer thickness. From these results, the reference velocity which ought to be used for the vortex shedding phenomena from the circular cylinder in the laminar boundary layer is defined.
社団法人日本機械学会の論文
1988-07-25