Research On The Hydrodynamic Performance Of Shallow Draft Full Ship In The Downstream Of Oujiang River

The Oujiang river is the second largest river in Zhejiang province, and the channel is rich of mineral resources, but because of its low level, the shipping tonnage is so small that cannot use water transportation, the Oujiang river shipping can’t play to the advantages of its low freight rate and large capacity. Improved channel condition brought about the naissance of the new ship. To improve the efficiency of the Oujiang river channel and increase the volume, the paper summarizes the channel elements of Ou River downstream, after the implementation of the development project in the middle and lower reaches of the Ou River. According to relevant norms and standards, the paper analyze the restrictions of channel scale, water level and bridge clearance on the ship’s principal dimensions, combined with the feature of ship form, the principal dimensions of the navigable 3000-ton ship was obtained. In order to make the new ship form can better play to the use performance and economic performance, better adapt to inland waterway depth curve more water conditions, this paper is developed from the aspects of resistance and propulsion.With the development of computer technology and software, CFD method has more and more widely used in the field of ship design and research, this paper first adopts the target ship’s resistance in deep water to verify the accuracy of the numerical calculation, considering the real condition of the Oujiang river waterway, the paper selects several depth of draft ratio, and calculate the static water resistance of different water depth under different speed, compares the difference of the resistance at different depth and analyzes the change of the total resistance and the relative component resistance, as well as the impact of the shallow water on the wave-making.Inland waterway is so curved that require high maneuverability of the ship, considering the characteristics of shallow draft ship, the new ship form will use the rudder propeller. To validate the good maneuverability of the rudder propeller, this paper chooses a test rudder propeller for numerical simulation, and simulate its open water performance first to verify the reliability of calculation, then analyzes its hydrodynamic performance under a certain angle, According to The simulation results, the turn torque is less affected by the speed of vessels, there will be good maneuverability at any ship speed. Theoretical calculation of propeller-hull interaction is a fairly complex subject, which involves the induced velocity field of hull and rotating propeller in ideal fluid, self-propelled simulation is carried on finally to analysis of the rule of the interaction.