New Developments Around Sheet and Tip Vortex Cavitation on Ships Propellers

摘要

A concept of tip vortex cavitation on propellers is described qualitatively, leading to the distinction oftrailing vortices, local tip vortices and leading edge vortices. Improvements of the inception behaviourusing this distinction are presented. Observations on developed tip vortex cavitation are given to showthat the concept of vortex bursting seems inadequate. The problem of "broadband" vibrations due to acavitating tip vortex is illustrated. Arguments are given for the fact that a three dimensional approachis necessary to describe shedding of cloud cavitation at the trailing edge of a sheet cavity.