System for limiting the vibrations induced by vortex on a rising column suspended by one end from a support and subject to external lateral fluid flows

摘要

The system includes a layer of material surrounding the column, the material having a specific permeability determined to limit turbulent detachments and therefore reduce fatigue engendered by vibrations induces by vortices. K is between 0.0001 and 100, preferably between 0.01 and 10 and ideally close to 0.1 where K is defined by k/(D2) = K/(Re), and k is the specific permeability, D the external diameter of the column and Re the Reynolds number. The thickness of the material is between 10-6 and 0.5D. The rising column is cylindrical.