734 フクロウ翼のセレーション影響について(J02-4 生物の機能/運動/機構/模倣(4),ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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It is well-known that the flapping sound of owl wings is smaller than that of other birds. Fine serration at equal spacing can be found in the leading edge of the primary feathers (remidges) of owl wings, and it seems that it has brought the silencing effect. Paying attention to the owl's posture during capturing games, the author considered that the effect of serration brought not only damping sound but also change of the aerodynamic characteristic of a wing. By attaching a jig saw blade, different numbers of cutting teeth which imitated serration to the leading edge in a laminar wing, the aerodynamic characteristics of an aerofoil were measured and the flow field around the aerofoil was also visualized. The author confirmed that lift force was maintainable by larger angle of attack than the prototype wing in low Reynolds numbers.
2008-08-02