Sinusoidal Gust Response of a Wing in the Vcinity of the Ground

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  • 地面近傍における翼の突風応答
  • ジメン キンボウ ニ オケル ツバサ ノ トツカゼオウトウ

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Abstract

The sinusoidal gust response of a wing which is flying in the vicinity of the ground was investigated theoretically and experimentally. Theoretically, the gust response functions of a lowaspect ratio wing were calculated applying LAWRENCE'S method of an oscillating wing. In this case, the lift force augmentation by the ground effect was obtained by the image wing technique.<BR>The experiments were performed by wind tunnel tests. That is to say, the sinusoidal gust was generated in the wind tunnel, and this gusty flow stroke the wing model. Then, the gust velocity and lift force fluctuation were mesured simultaneously.<BR>The lift force augmentation which was expressed by the ratio of response function with ground to that without ground was compared with that of the theoretical value.<BR>It is found that both of them agree well with each other for several case. Consequently, it may be said that the theoretical values in this paper can estimate the ground effect on the gust response of a wing pretty well. However, it would be difficult to investigate this problem more precisely by perturbation theory, since the gust velocity distribution becomes shear flow and linearity assumption would not hold in the vicinity of the ground.

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