一様流中で振動する円柱の前方よどみ点近傍の流れ : 第1報,流れの観察と表面せん断応力の測定

概要

論文の詳細を見る
The flow near the front stagnation point on a circular cylinder oscillating transversely in a uniform flow was investigated by flow visualization techniques. A piece of short fine wire (5 mm in length) was set on the cylinder like a whisker for the generating wire of hydrogen bubble techniques. This whisker-like generating wire was found to be useful to visualize the flow near the stagnation point. In contrast, a long fine wire (40 mm in length) set along the streamline toward the stagnation point strongly disturbed the flow and induced a pair of necklace vortices around the cylinder. The velocity and wall shear stress near the stagnation point were measured with the phase angle of the oscillating cylinder. Under a constant amplitude of the oscillating velocity of the cylinder, the maximum value of the wall shear stress at the center of the displacement of the stagnation point was found to increase with the oscillating frequency of the cylinder. The increase of the shear stress is closely related to the excess displacement of the stagnation point.
社団法人日本機械学会の論文
1988-09-25