三次元振動翼による渦の生成(生物の流れ(2),一般講演)

概要

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The actual motion of a hand in swimming is obviously unsteady, and time-dependent fluid forces must be considered, because a quasi-steady-state approach towards predicting the fluid forces acting on a hand under unsteady conditions yielded errors. To evaluate the force correctly, it is necessary to know the unsteady properties determined from the vortex dynamics. The purpose of this study is to investigate the relationship between unsteady fluid forces and the vortex behaviors of a three-dimensional airfoil during pitch-oscillating motion. The measurements of unsteady fluid force under the pitch-oscillating motion of a discoid airfoil are carried out in a wind tunnel. The flow structures due to the behaviour of vortices in the wake are strongly affected by the reduced frequency, and the fluid force acting on the airfoil model increases with increasing the reduced frequency. Therefore, unsteady fluid force variations are significantly related to the vortex behaviour during the one oscillating cycle
2010-09-09