低ピッチ回転翼のねじりフラッタ

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タイトル別名
  • The Pitching Flutter of Low Pitch Rotary Wings
  • テイピッチ カイテンヨク ノ ネジリ フラッタ

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Theoretical and experimental investigations have been carried out on the flutter characteristics of low pitch rotary wings. It has been found that, the mode of oscillation is purely pitching at the incipience, and the ratio of frequency to rotary speed always takes values of integer and some definite fractions, which are related to the number of blade indifference of other conditions. And it seems rather contradictory from the standpoint of usual two dimensional treatment of unsteady airfoil motion which presumes the infinite row of wake vortices. To interprete the phenomena the auther proposed an assumption that the wake is interrupted by the rear blade. The simplified formula about the reduced frequency thus derived, has been sufficiently verified by the rotor experiment.

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