有限長円柱の後流構造と空力特性に関する研究 : 第2報, 組織性表面変動圧力および変動流体力の評価とそのアスペクト比依存性

概要

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Many components of organized fluctuating pressures with different frequencies, which may be induced by the turbulent organized structures in the wake, have been extracted from the surface pressures on the finite circular cylinders with aspect rations from 1 to 12 at a Reynolds number of 3.7×10^4 using phase-locked averaging technique. The organized local and global fluctuating fluid forces acting on finite cylinders have been determined from these results. For cylinders with high aspect ratios, as large as more than 8,three different components of organized local fluctuating fluid forces act, i.e., tip component which appears near the tip exhibiting the largest amplitude, the midspan component as well as the root component which is similar to that for a two-dimensional cylinder. The lateral force and the rolling moment dominate in the organized global fluctuating fluid forces for many aspect ratios, but only a little organized fluctuating fluid force acts on the cylinders with aspect ratios from 5 to 6.
1998-11-25