カルマン渦流量計内部の流れ構造に関する実験的研究 : 第1報, トリプルワイヤによる流速測定

概要

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The structure of the Karman vortex shed from two-dimensional bluff body placed in a fully developed turbulent pipe flow was investigated experimentally with air (mean velocity U_m=10m/s, Re_D=10^5). The ratio of the bluff body width (w) to the pipe inner diameter (D) was 0.28. Velocity fluctuations were measured at 30w downstream of the bluff body by using a triple-wire probe. The flow behaviour was analyzed through the determination of the mean velocity distribution, velocity fluctuations during the vortex shedding period, the convection velocity of the vortex street and the vorticity distribution by employing the phase averaging method. The results showed that the convection velocity of the vortex street is lower than that in the free stream. The ratio of the streamwise distance of the vortices to the transverse distance is larger than that in the free stream. And also there are two groups of high vorticity areas, whose peak values are much larger than those of Karman vortex shed in the free stream.
一般社団法人日本機械学会の論文
1998-03-25