鈍頭円柱前縁はく離領域の構造と周期的かく乱に対する応答

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  • Effects of Periodic Forcing on a Turbulent Separation Zone of a Blunt Circular Cylinder.
  • ドントウ エンチュウ ゼンエン ハクリ リョウイキ ノ コウゾウ ト シュウキ

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The leading-edge separation bubble of a blunt circular cylinder was forced by a sinusoidally oscillating jet issued from a thin slit along the separation edge. Reynolds number was in the range of 7000-10000. The level of excitation was measured at a position (near the edge) where the time-mean velocity attained a maximum value. The time-mean and r. m. s. velocities in the separation bubble were measured by a laser Doppler velocimeter. The secondary separation zone was found in the separation bubble at the above Reynolds numbers. This zone became smaller with increasing Reynolds number. The reattachment length generally decreased with decreasing frequency of forcing ; this suggests that a minimum reattachment length is probably realized at a particular forcing frequency. The time-mean and r. m. s. velocities were compared between the forced and unforced separation bubbles.

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