S0505-1-6 リングファンの空力騒音に及ぼす羽根周りの流れの影響(車両・機体・流体機械に関連した騒音問題へのアプローチと対策(1))

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  • S0505-1-6 Influence of Flow Field around Impeller on Aerodynamic Noise of a Ring Fan

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The ring fan is a blower that has a shroud assembly at the tip side of the axial flow impeller. In this study, to clarify the influence of the flow around the impeller on the aerodynamic noise of the fan is aimed. The following fan characteristics were obtained; the efficiency of the ring fan is improved about 13% than the propeller fan, the specific noise level is reduced about 6dB. The potential of the blade tip vortex of the ring fan has been weakened by the shroud assembly. The blade tip vortex of the ring fan is generated at outside of the diameter of the impeller; the relative flow is attached to the.blade surface by the tip vortex. From these results, the overall characteristics of the fan improved by the decrease of the relative velocity.

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