AM05-04-016 前縁端部に小さな切り欠きを有する矩形柱の抗力軽減(境界層とせん断流4,一般講演)

概要

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The drag reduction of a rectangular cylinder with the width/height ratio c/d<0.7 was investigated. The drag coefficient of the cylinder is very large from 2.0 to 2.8. To control the flow field around the rectangular cylinder, small rectangular cutouts were made in both the front edges. Experiments were performed by varying the width/height ratio of c/d from 0.38, 0.50, 0.63 and 0.70. For the cylinder with cutout, the shear layers separated from the front edges of the cylinder reattach on both sides of the cylinder. This caused the transition in the shear layers, and thus, the turbulent separations occur. As the results, the wake width decreases and the vortex formation region goes downstream. The Strouhal number increases beyond 0.24 and the base pressure coefficient raises. The drag coefficient of the rectangular cylinders with small cutouts decreases to about half that of the rectangular cylinder without cutout.
日本流体力学会の論文
2005-09-05