渦励振に及ぼす円柱列間隔の影響 : 流体工学,流体機械

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This paper describes the effect of spacing of circular cylinder row on vortex exciting vibration. The experiment was carried out in an N. P. L. blow-down type wind-tunnel with a working section of 500 mm×500 mm×2000 mm, and with the Reynolds number of 9.4×10^3. The test cylinder was supported by the elastic wires. The power spectrum in the wake behind circular cylinders, displacement of the oscillating circular cylinder, and the time-mean and fluctuating surface pressure distributions on the circular cylinder were measured. Consequently It was found that (i) vortex shedding from circular cylinders occurs in the range of spacing ratio S/D≥1.5, while there Is two patterns regarding the existence of vortex shedding from circular cylinders in the range of 1.5≤S/D≤2.0, (ii) the displacement of oscillating cylinder due to the shedding vortices attains maximum at S/D= 2.3, (iii) the fluctuating pressure distribution on the surface and fluctuating lift by frequency of shedding vortices become largest at S/D=2.3.
社団法人日本機械学会の論文
2001-07-25