Abstract
Time-averaged flow fields behind finite circular cylinders with aspect ratios from 1.25 to 10 located on a ground boundary in a uniform flow have been determined at a Reynolds number of 3.7×104 and influences of the aspect ratios on the wake structures have been presented. Three-dimensional velocity distributions from 1 to 20 diameters downstream of the cylinders have been obtained using newly developed rotating yaw-meter system, from which the details of the wake flow fields behind the finite circular cylinders have been discussed. Streamlines and vortex lines have been calculated from the velocity fields and the wake structures, such as the features of vortex systems in the wake and their changes in shape with distance downstream, have been presented. Effects of the configurations of free ends of the cylinders on the wake flows have been studied using modified cylinders with hemispherical fairing, circular pipes as well as flat plates.
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