Research On The Hydrodynamic Performance Of The Propeller-rudder-boss Cap Fin Based Fluent

With international oil prices increasing, environmental issues have become increasingly prominent in the global promotion of energy saving technologies. Shipping industry accounted for heavier energy consumption. Improving energy efficiency of the ship is the focus of China’s shipbuilding industry. The propeller is the device which power ships. Propeller propulsion efficiency associates not only with the parameters itself, but also affected by the rudder, the hull and other devices when ship sailing.First, We use the Fluent software to calculate the performance of DTMB P4119 paddle under different speed coefficient in open water. Comparing the calculation results with the experimental results finding that the error are within the allowable range of engineering. Therefore verifying that it is feasible to use the Fluent software to calculate the hydrodynamic performance of the propeller.Second, we build a propeller-rudder system model, using Fluent software to carry out series of numerical simulation carried out at different speeds. Comparing with the open water propeller model results, the efficiency of the propeller- rudder model gain up to 2.5851%. Thus explain the rudder at the beginning of the construction of the ship can be used as a good energy saving devices.Finally, we build a propeller-rudder- fin model for numerical simulation the boss cap fins by diameter、installation angle、the axial position of the three different parameters. Thus determining the best parameters of PBCF with the impact of the rudder. The best parameters are incongruous with the PBCF parameters without rudder’s impact. The eventual establishment of optimum parameters of the paddle- rudder- fin model, compared with the open water propeller efficiency gains up to 3.7833%, compared with plus fin propeller efficiency gains up to 2.4766%.