Abstract
This paper deals with self-excited vibration of an overflow pipe due to fluid discharge. The vibration characteristics, instability mechanism and regions of the self-excited vibrations generated in the overflow pipe, which have an elbow at the tip of the pipe, are examined by theoretical analysis and experiments. In the theoretical analysis, a theoretical model of the self-excited vibration in vertical direction is developed, and instability regions and conditions are examined by the stability analysis. In the experiments, instability regions and boundaries, at which the self-excited vibration occurs, are examined by alternating the fall height (vertical pipe length), horizontal pipe length, and the flow rate. The theoretical results are in good agreement with experimental ones about the instability regions.
