910 一様水流中の柔軟な弾性膜に発生するフラッタリング(GS-2 バイオエンジニアリング(2))

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The fish's thrust results from actions of swimming fish that the fish's body is made to generate traveling waves by bending itself and transmits them downward. We think that fluttering has the possibility of drag reduction because it generates some thrust and assists main power. So we focus on fluttering in fluid. Study of fluttering was done using various kinds of elastic sheets having high and low stiffness. Our experimental models consisted of a flexible rear made of a very thin silicone rubber sheet which was easily deformed and a rigid front made of stainless steel. It was placed in a water tunnel. A laser light sheet method was used to visualize the deformation of the flexible sheet and the flow field around the model. From the visualization experiments, we measured the wave velocity, wavelength, frequency and amplitude of traveling wave on fluttering of a flexible sheet. We calculated fluttering of a flexible sheet with the model that the wave form was assumed and the principle of the energy conservation.
2004-03-17