Numeric computation and simulation on the hydrodynamic performance of the propeller-rudder-rudder bubble combination

TLDR: In this article, a computer simulation system of the hydrodynamic performance of the propeller-rudder-rummer bubble combination was built, in which vortex lattice method and Hess-Smith boundary element method were used.

Abstract: Computer simulation system of the hydrodynamic performance of the propeller-rudder-rudder bubble combination was built.The hydrodynamic performance computation method of the propeller-rudder-rudder bubble combination was studied,in which the hydrodynamic performance of the propeller was calculated with vortex lattice method,while the influence of the hub to the hydrodynamic performance of the propeller was calculated with Hess-Smith boundary element method.For thinking about the influence of the rudder and rudder bubble,the velocities induced by the rudder and rudder bubble was regarded as correction of the velocity of the incoming flow of the propeller and hub.Computer simulation system was used to design and simulate four kinds of propeller-rudder-rudder bubble combination,then the comparison with the computation result of the original propeller-rudder design was carried out.It is shown that the designed rudder bubbles can increase the efficiency of propeller obviously,in which the dissymmetric rudder bubbleachieves energy-saving effect 5.1% and increases the power reserve of main engine up to 5% in real boat test.