正三角形千鳥配列円管群内での双子渦の放出(流体工学,流体機械)

概要

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In the present paper the attention is focused on the vortex shedding from the tubes in closely arranged normal triangle tube banks. The tube banks were installed rigidly in the test section of the wind tunnel. We measured the spectrum and the phase delay of velocity fluctuation as well as the gap velocity in the simulated tube banks with spacing ratios of 1.43, 1.74 and 2.58. A single high peak was formed in the spectrum of the velocity fluctuation downstream of the second row of the tube banks with spacing ratios of 1.43 and 1.74. This peak frequency increased in proportion to the mean gap velocity. As a result it was made clear that the symmetric pair of vortices were clearly formed even in the case of Reynolds number, based on mean gap velocity, of about 7.4×10^4. Strouhal number, based on mean gap velocity and vortex shedding frequency, was 0.46 at spacing ratio of 1.74 and 0.54 at 1.43.
一般社団法人日本機械学会の論文
2004-01-25