前進速度を有する小アスペクト比振動平板翼に作用する流体力について

DOI NDLデジタルコレクション NDLデジタルコレクション Web Site 被引用文献3件

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タイトル別名
  • New Approach to Hydrodynamic Forces on Oscillating Low Aspect Ratio Wings
  • ゼンシン ソクド オ ユウスル ショウ アスペクトヒ シンドウ ヘイバンヨク

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抄録

A new approach to calculating the hydrodynamic forces acting on harmonically oscillating low aspect ratio wings is presented. This approach is based on free streamline theory and lifting surface theory. The hydrodynamic forces can be represented by a linear combination of the inertia force, the first order damping force, that is to say “lift”, and the second order damping force, that is to say “drag”. Each component of these forces estimated by the model of lifting surface with free stream is compared with the experimental results obtained by the forced oscillation of rectangular low aspect ratio wings. And chordwise pressure distribution estimated by the model is compared with that of measurement.<BR>As the results of these comparisons, the following conculsions are derived :<BR>1) Although the equivalent total drag coefficient, Cdt, of estimation increases monotonously with the inverse of reduced frequency, that of experiment is not so much varied with reduced frequency, k, for fixed period parameter, P. P., and aspect ratio, A. R. In the range of small 1/k the experimental Cdt becomes less than that at the time when 1/k equals to zero.<BR>2) The result of the chordwise pressure distribution shows that as 1/k increases drag forces decrease and lift forces increase, so Cdt is not so much varied then.<BR>3) The added inertia coefficient, Cm, of experiment is remarkably dependent on k however, that of estimation is close to 1.0 and less dependent on k in low aspect ratio wings. In the range of small 1/k experimental Cm is much greater than 1.0 and it becomes close at estimated Cm as 1/k increases.

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