ピッチング/ヒービング運動翼後流の渦構造(S22-4 物体周り流れの制御-2,S22 流れ制御の技術)

概要

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Many studies on unsteady flow behind an unsteady airfoil have been carried out with experimental and numerical approaches. However, the detailed vortex structure has not been understood sufficiently. In order to clarify the quantitative vortex structure behind pitching and heaving airfoils at low Reynolds number region, we have carried out the particle image velocimetry (PIV) measurement at Re = 4000. The thrust producing vortex street was formed behind pitching airfoil with high non-dimensional trailing edge velocity and heaving airfoil with high non-dimensional heaving velocity. The vorticity in the thrust producing vortex street of heaving airfoil was higher than that of pitching airfoil. As a result, velocity profile in the wake of heaving airfoil was larger than that of pitching airfoil. The maximum velocity in the wake increases as the non-dimensional trailing edge velocity and non-dimensional heaving velocity increases.
2004-09-04