Abstract
This paper deals with an experimental study of vortex-induced vibrations of bellows structure subjected to fluid flow. The characteristics of the vortex-induced vibrations are examined experimentally with changing the gap length, the pitch length, the arrangement of bellows structure and number of flexible convolutions. The fluid flow around the vibrating convolutions is visualized and the structure of the vortex street is clarified. As a result it is found that the reduced flow critical velocity is about 5, without being dependent on a number and a p/D.
