タンデムフィン列およびオフセットフィン列の流動に関する実験的研究 : フィン厚さおよびフィンピッチが流れの不安定化に与える影響について

概要

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The flow visualization and the measurement of velocity fluctuations in the streamwise and the spanwise directions were carried out for in-line fin arrays. It was observed that the streakline becomes unstable and bends in the wake of a fin in the middle range of the Reynolds number and that the streakline bend exhibits a hook-shaped pattern in the neighbourhood of the leading edge of the downstream fin. The destabilized flow suggested by the presence of these unstable streaklines was estimated to cause the velocity fluctuation of fluid near the fins. The same flow visualization was performed for 5-row offset fin arrays. However, it was found that wake flow instability is promoted as the fin pitch becomes narrower and that the flow near a fin interacts and is synchronized with those of neighbouring fins. The frequency of appearance of the bend of a streakline is found to depend mainly on the fin pitch .
一般社団法人日本機械学会の論文
1993-04-25