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＜紀要論文＞
VISUAL STUDIES OF WAKE STRUCTURE BEHIND TWO CYLINDERS IN TANDEM ARRANGEMENT
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| 概要 | Wake structure behind two circular cylinders in tandem arrangement is investigated experimentally by means of a hot-wire anemometer and flow visualization techniques in the range of Reynolds number fr...om 10^2 to 10^3. Spacing between central axes of two cylinders with equal diameter is varied in the range 1.5<s/d<10, where s is the spacing and d the cylinder diameter. The downstream cylinder is stationary or forced to vibrate in the transverse direction at various frequencies and at two values of amplitudes of 0.1d and 0.3d. When both cylinders are stationary, the vortex shedding frequency measured behind the downstream cylinder changes discontinuously at a critical value of spacing for each Reynolds number. The flow visualization reveals that different patterns of vortex street appear in the wake according to spacings. When the downstream cylinder is forced to vibrate sinusoidally at frequencies near the Strauhal frequency of vortex shedding for two stationary cylinders, the vortex shedding is synchronized with the vibrations of the cylinder. At two ends of the synchronization region, the elongation and contraction phenomena of vortex streets can be seen even at small oscillation amplitudes.続きを見る |
| 目次 | 1. Introduction 2. Experimental Apparatus and Methods 3. Experimental Results 4. Conclusions |
本文ファイル
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032099_p001
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5.93 MB | 327 |
詳細
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| 登録日 | 2023.04.07 |
| 更新日 | 2024.10.22 |