Vortex-induced Vibrations And Lock-in
Phenomenon Of Bellows Structure Subjected
To Fluid Flow
Author(s)
M. Watanabe & M. Oyama
Abstract
This paper deals with an experimental study on vortex-induced vibrations of
bellows structures subjected to fluid flow. In the experiments, the bellows
structure consists of flexible convolutions, and is subjected to fluid flow in a
water channel. The vibration strains of the flexible convolutions are measured
with increasing flow velocity. The vortex-induced responses are examined with
changing the convolution pitch and number of the flexible convolutions.
Moreover, the vortex shedding coupled with the vibrations of the convolutions is
visualized. As a result, it is clarified that the vortex-induced vibration and lock-in
phenomenon occur to the flexible bellows structures with large amplitude. The
boundary of the lock-in region and Strouhal number are clarified, and detailed
excitation mechanism of the vortex-induced vibration and lock-in phenomenon
due to the vortex shedding is presented.
Keywords: vortex-induced vibration, vortex shedding, bellows structure, lock-in
phenomenon, Strouhal number.
1 Introduction
Flexible bellows are used widely in many industrial applications as expansion
joints conveying fluid in piping and engine systems. Unfortunately, flexibility of
the bellows makes them susceptible to vibration and, in particular, flow-induced
vibration resulting from internal flow across the tips of the bellows convolutions.
Up to this time, some research has been conducted on flow-induced vibrations
of the bellows due to internal fluid flow. Gerlach [1,2] examined the detailed
Keywords
vortex-induced vibration, vortex shedding, bellows structure, lock-inphenomenon, Strouhal number.
Related Book
Other papers in this volume
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