Flow Induced Vibration Of Corrugated Rod Subjected To Axial Flow

Abstract

Preliminary experiments were performed for studying flow induced vibration of a rod wrapped by transverse shapes corrugation (repeated ribs) and subjected to axial flow. Flexible rods with different repeated ribs pitches and widths were tested. The vibration amplitude was measured and the damping ratio of every rod was evaluated, in order to estimate the amplification effect of the repeated ribs on the rod, compared to the results on a smooth rod. The effect of different parameters on the vibration is being discussed. It was found that the repeated ribs have an effect on the pressure drop increases produced by the turbulence augmentations. Empirical correlations form of the vibration amplitude at middle rod span is being proposed.