リング設置による円柱からの渦放出抑制 : 後流渦構造の変化(流体計測・実験(4),一般講演)

概要

論文の詳細を見る
Omnidirectional reductions in drag and fluctuating forces were achieved for a circular cylinder subjected to cross-flow by attaching cylindrical rings along its span at an interval of several diameters. In this work, the effects of ring configuration, the diameter D, spanwise width W, and spanwise pitch P, on the vortex shedding suppression was investigated. As a result, it was found that the periodic pressure fluctuation on the sides of the cylinder was almost disappeared for Re_d>20000 at ring configurations of D/d=1.3, W/d=1 and P/d<4. This is related to the formation of transverse vorticity just behind the ring edge, which results in absence of two-dimensional flow field in the near wake between two adjacent rings due to the smaller axial spacing of the rings.
日本流体力学会の論文
2008-09-04