二次元キャビティ上の壁面噴流により発生する流体音の受動的制御

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  • Passive Control of Aerodynamic Sound Generated by Wall Jet over Two-Dimensional Cavity
  • 2ジゲン キャビティ ジョウ ノ ヘキメン フンリュウ ニ ヨリ ハッセイ スル リュウタイオン ノ ジュドウテキ セイギョ

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Control of a cavity tone has been done using triangle projections attached at an exit of two-dimensional jet. Experimental results of sound pressure level show that the projections obviously reduce both total sound pressure level and sound level of the dominant frequency of the cavity tone. The sound dumping effect is increasing with increasing number and/or height of projections though this dumping effect saturates with the certain number of projections at the nearly same sound level as that in the wall jet case. The spanwise distribution of pressure fluctuation at the downstream cavity edge has the minima at the right downstream position of the projections and at the other spanwise positions pressure fluctuation is homogeneously reduced. This result suggests that the mechanism of sound dumping is not only breaking two-dimensionality of flows.

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