Mesh Generation Technique for the Analysis of Ducted Propellers Using a Commercial RANSE Solver and its Application to Scale Effect Study

摘要

From the point of view of hydrodynamic analysis ducted propeller represents a noticeably more complicated problem compared to open propeller because its performance is defined by the interaction between propeller and duct and, ultimately, by the interaction within the whole system ship hull/propeller/duct. Since such interaction is, to significant extent, viscous in nature, one may expect scale effects on ducted propeller to be more difficult to capture using traditional extrapolation techniques (Stierman 1984), or analysis methods based on potential flow theory (Krasilnikov et al 2005, Krasilnikov et al 2006). Beside overall effect on propeller and duct forces through the changes in lift and drag, the change in Reynolds number is also responsible for the following effects.