弾性管による摩擦抵抗軽減に関する実験的研究 : 変位変動特性

概要

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Drag reduction of pipe flow using flexible tubes was experimentally examined with respect to the displacement fluctuation characteristics, by means of a noncontact-type measuring instrument. The results show that the thinner the flexible tube and the larger the Reynolds number, the larger is the energy of the power spectrum distribution of the fluctuating displacement. Therefore, these phenomena have negative correlations with those of the fluctuating pressure mentioned in the previous paper. In the case of the thinnest flexible tube measured newly in the present paper, this tendency, which is the reason for drag reduction, is the same for the higher frequency of the fluctuating pressure. On the other hand, the band energy having the lower frequency of fluctuating pressure is the reason for drag increase.
一般社団法人日本機械学会の論文
1995-01-25