B222 飛翔性鳥類の初列風切羽に関する空力弾性論

概要

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The present study affords theoretical basis for ornithologists' statement : the presence of asymmetry in primary feathers is the evidence of bird's flight ability. Multiple feathers are modeled as two-dimensional thin shell airfoils in incompressible flow. Conventional wing theory and thin shell theory lead to an integro-differential equation on the unknown feather camber. Ten-feather interaction problem was solved. Optimal vane locations of feathers are found to take values between 25% chord and upper bounds 32∿48% chord under minimum bending condition, and agree qualitatively with observation. Interaction of feathers results in upstream-heavy load distribution, in which about 40% of overall lift concentrates upon the most upstream feather. Deformation of feathers under air load suggests that actual locations of vanes, closer to leading edge than the present solutions, would reduce the effective angle of attack and accordingly heavy air load on upper stream feathers.
日本流体力学会の論文
2000-07-25