年次大会
Online ISSN : 2424-2667
ISSN-L : 2424-2667
セッションID: S054023
会議情報
S054023 流れ方向強制振動直列二円柱からの渦放出([S05402]噴流,後流,およびはく離流れの基礎と応用:最前線(2))
横井 嘉文大澤 翠美佐藤 美紀
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In this study, the flow features of vortex shedding from a pair of tandem arranged circular cylinders oscillating Jong the direction of the flow were observed by visualizing water flow experiment at the ranges of the frequency ratio YK=0-7 , the amplitude ratio 2a/d=0.25 and 0.5, the distance ratio L/d=1.5, 2.5 and 5.5 and Reynolds number Re=640. the variations of mean vortex shedding frequency were investigated. Although the cylinder oscillation frequency f is ower than the natural Karman vortex's frequency fK, the lock-in phenomenon can be seen even in tandem arrangement ;ase. The lock-in ranges have been shown in each distance ratio L/d. It is found that the lock-in ranges become wide vhen comparing with the single cylinder case. The typical flow patterns of the lock-in or un-lock-in states were shown Nery distance ratio L/d. In distance ratios L/d=2.5 and 5.5, the twin vortex street from the 2nd cylinder (rear set ;ylinder) was not seen.
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© 2011 一般社団法人 日本機械学会
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