Abstract
The in-line vibrations of an elastically supported circular cylinder subjected to cross flow were experimentally investigated, where velocity fluctuations in the cylinder wake were measured by two probes of a hot-wire anemometer symmetrically set up. Typical in-line vibrations were observed in two flow velocity ranges, one in the reduced flow velocity of 1.3-2.5, and the other in 2.5-3.5. In higher velocity range, out-of-phase velocity fluctuations were measured, which shows alternative vortex-shedding. In lower velocity range, in-phase velocity fluctuations were observed, which shows symmetrical vortex-shedding. Flow visualization confirmed the periodical formation and shedding of symmetrical vortices. It is concluded that the in-line vibration in low flow range is a kind of hard self-excited vibrations due to the interaction between the cylinder vibration and the symmetric vortex formation by the cylinder vibration itself.
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