Experimental study of vortex-induced vibrations of a cylinder near a rigid plane boundary in steady flow |
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Authors: | Bing Yang Fuping Gao Dong-Sheng Jeng Yingxiang Wu |
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Institution: | (1) Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China;(2) Division of Civil Engineering, School of Engineering, Physics and Mathematics, University of Dundee, Dundee, DD1 4HN, Scotland, UK |
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Abstract: | In this study, the vortex-induced vibrations of a cylinder near a rigid plane boundary in a steady flow are studied experimentally.
The phenomenon of vortex-induced vibrations of the cylinder near the rigid plane boundary is reproduced in the flume. The
vortex shedding frequency and mode are also measured by the methods of hot film velocimeter and hydrogen bubbles. A parametric
study is carried out to investigate the influences of reduced velocity, gap-to-diameter ratio, stability parameter and mass
ratio on the amplitude and frequency responses of the cylinder. Experimental results indicate: (1) the Strouhal number (St) is around 0.2 for the stationary cylinder near a plane boundary in the sub-critical flow regime; (2) with increasing gap-to-diameter
ratio (e
0/D), the amplitude ratio (A/D) gets larger but frequency ratio (f/f
n
) has a slight variation for the case of larger values of e
0/D (e
0/D > 0.66 in this study); (3) there is a clear difference of amplitude and frequency responses of the cylinder between the larger
gap-to-diameter ratios (e
0/D > 0.66) and the smaller ones (e
0/D < 0.3); (4) the vibration of the cylinder is easier to occur and the range of vibration in terms of V
r
number becomes more extensive with decrease of the stability parameter, but the frequency response is affected slightly by
the stability parameter; (5) with decreasing mass ratio, the width of the lock-in ranges in terms of V
r
and the frequency ratio (f/f
n
) become larger.
This project was supported by the National Natural Science Foundation of China (50509022, 10532070), Knowledge Innovation
Program of the Chinese Academy of Sciences (KJCX2-YW-L02). |
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Keywords: | Vortex-induced vibration Cylinder near a plane boundary Steady flow Vortex shedding |
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