Abstract
This paper deals with the experimental study of flow-induced vibration of multiple flexible disks rotating in a confined fluid subjeted to swirling fluid flow. The experiment is carried out to investigate the characteristics of the unstable vibration and the effect of the number of the rotating disk on the critical speed at which the flow-induced vibration occurs. Following major results are obtained. (1) Critical speed of the system which has more than two disks is much lower than that of one disk system. (2) Flow-induced vibration occurs as a travelling-wave (0, 3) mode with three nodal diameters. (3) The travelling speed ratio of the system which has more than two disks is larger than that of the one disk system. And the ratio is independent of the disk rotational speed. (4) Amplitude of the vibrational displacement of the extreme rotating disk is much larger than that of intermediate rotating disk for the system which has more than three disks.
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