回転する単独平板翼の近傍後流中の周期的速度変動成分による広帯域騒音の発生

概要

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We have experimentally investigated the relationship between the periodic velocity fluctuation in the near wake of a rotating flat-plate blade and the generation of broadband noise in the case of different setting angles and types of blades. A typical periodic fluctuation of the near-wake flow is caused by Karman vortex shedding from the trailing edge of the blade. Periodic fluctuation due to Karman vortex shedding generates a discrete frequency noise even in a rotating flow field. The frequency of the periodic fluctuation in the rotating flow field increases with the radius of the blade. Discrete frequency noises due to different frequencies generated from a near-wake How along the blade span result in the occurrence of broadband noise from the rotating flat plate blade.
1994-08-25