羽ばたき翼周りの流れの可視化(生物の流れ(1),一般講演)

概要

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In order to clarify the relationship between aerodynamic forces and flow structures around a mechanical flapper, instantaneous flow fields were measured with a dynamic PIV system. In the down-stroke process, separated vortices shed from the both of the leading edge and trailing edge. These vortices seem to be connected near the tip of the wing. Therefore, the shape of three-dimensional vortex structure around the flapping wings was similar to doughnut-shaped. The leading edge vortex was dragged to the bottom dead-center with the movement of the flapping wing. On the other hand, the trailing-edge vortex was split into two vortices near the top dead center. One of the separated vortices stayed near the top dead center, and the other was moved to the bottom dead center such as the leading edge vortex. The induced velocity caused by vortex interaction generated thrust force.
2010-09-09