昆虫を模擬した翼を用いた羽ばたき運動時のPIV計測(生物の流れ(1),一般講演)

概要

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An experimental study was conducted to measure the flow around a corrugated dragonfly airfoil. Flow fields were obtained at several numbers of angles of airfoil models, by applying a high-speed PIV system whose timing of data was synchronized with the timing controller. Chord-based Reynolds number was Re=U_0w/v=2.55×10^3, where U_0m/s is the mainstream velocity and w m is the width of the airfoil model. Flow characteristic such as instantaneous velocity and vorticity were derived from high-speed PIV measurements. The result demonstrated the different instantaneous vorticity fields between flat plate and corrugated dragonfly airfoil at high-angle of attack. Detailed measurements around corrugated dragonfly airfoil visualized that corrugated configurations control the detachment and vortex scales. Moreover, the protruding configuration of the dragonfly airfoil was found to be acting such as "dimple" to generate unsteady vortices to promote the transition of the boundary layer from laminar to turbulent.
2010-09-09