Abstract
We studied experimentally the characteristics of unsteady fluid forces in single-phase water and two-phase air-water flows using one sinusoidally oscillating and two elastically supported circular cylinders. We also studied the effects of air bubbles in suppressing vibration in a single-row of cylinders. Adding air bubbles reduced cross-flow-induced, unstable vibrations occurring at a reduced velocity of about 3 in a water flow. Unsteady fluid forces were very large and led to displacement in the phase angle when the single-row cylinder system was vibrationally unstable. The two-phase flow-induced fluid forces became small and rather random when the displacement was small. We discussed the vibration suppression mechanism by comparing the unsteady fluid force characteristics of single-and two-phase flows.
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