Study On Hydrodynamic Performance Of Paddle Rudder Combined Energy-saving Device Based On CFD Technology

In the field of ship design and manufacturing,propellers are currently the most widely used propellers,which cooperate with the steering gear to achieve the maneuverability of the ship.The research of ship's energy-saving devices has been continuously developed in the field of ship design and manufacturing.Traditional energy-saving devices are developed using standard ship types and oars,and rely on experiments.However,due to the limitations of experimental facilities and human and material resources,there are certain resistances to the experimental methods.With the rapid development of computer technology,computational fluid dynamics(CFD)has been widely used in the field of ships.In the research of ship's energy-saving propulsion devices,additional devices are mainly installed before and after the propeller to recover the rotational energy and vortex energy of the tail flow field during the rotation of the propeller,improve the propulsion efficiency of the propeller,and achieve the purpose of energy saving.In front of the paddle,it can install front guide tube,free rotating impeller,compensation tube,rectifier fin,fixed impeller,guide bracket,etc.;after the paddle,you can install free rotating impeller,fixed guide wheel,hub cap fin,rudder ball,rudder additional Thrust fins,flap rudders,twisted rudders,etc.Based on the research of MAU4-40 propeller,this paper builds its three-dimensional model in UG software,and imports it into STARCCM + software for numerical simulation to calculate the hydrodynamic performance of MAU4-40 propeller.The reliability of the CFD method.The hydrodynamic performance of the MAU4-40 propeller under three different turbulence models was calculated separately.After comparison and analysis,the calculation results of the standard K-Epsilon two-layer model and the experimental values were smaller,and it was selected as the turbulence for subsequent research model.After the MAU propeller,NACA0015 rudder,twisted rudder,twisted rudder with rudder ball,and flap rudder were added to form four propeller-rudder combination devices.The three-dimensional model establishment of the four devices was completed by UG software,imported into STARCCM + software to calculate the hydrodynamic performance,and obtained the changes of thrust coefficient,torque coefficient and efficiency,and compared and analyzed the hydrodynamic performance of the four propeller-rudder.Calculate the hydrodynamic performance data of the propeller-rudder system under different working conditions.By changing the propeller-rudder spacing and rudder angle conditions,the thrust coefficient,torque coefficient and drag coefficient of the four propeller-rudder systems are predicted.Based on the NACA0015 rudder,the open water efficiency of the twisted rudder,the twisted rudder with the rudder ball added,and the flap rudder under different rudder pitch and different rudder angle conditions are analyzed to obtain energy-saving effects and provide for future projects Learn from.