Hydrodynamic Performance Simulation Of Composite Propeller

With the development of shipping industry, people put forward higher requirements on the ship performance. Screw propellers are the most widely used marine propulsive devices which provide thrust for the ship sailing .As its design method has been very perfect at present, People start to think about the possibility by changing the material to improve the propulsion performance. At this time, composite materials into the line of sight of people with its rich source, light mass, easy forming, corrosion resistance, etc. Especially, through the reasonable arrangement of blade layer direction and sequence, the anisotropy of composite materials make the blade deformation under the hydrodynamic load, Improve the efficiency of ship propulsion. This article is based on the fluid-structure coupling method. By using ANSYS workbench, hydrodynamic performance of the composite materials has carried on the forecast.First, conventional propeller hydrodynamic performance prediction method is introduced.We prove mesh and turbulence model has nothing to do with the result. After this, we get thrust coefficient, torque coefficient and open water efficiency from the metal propeller under different advance coefficient. By comparing calculation value and experimental value, the CFD method was verified the reliability of the prediction of propeller open water performance.Then, the deformation under the action of fluid load is passed to the propeller structure,it affect the flow field of the deformation in turn. Through this way, we get the fluid-solid coupling numerical simulation method of propeller. Composite propeller hydrodynamic performance prediction method is introduced. We can get the metal and composite propeller open water efficiency curve. Compared with the experimental value, the method for metal propeller is correct. By comparison, the hydrodynamic performance of composite materials is better than that of metal materials.At last, we do the variable parameters analysis to composite propeller hydrodynamic performance. We choose the several geometrical parameters like the pitch ratio, area ratio,skews for numerical calculation. The study found that pitch ratio has an important influence on hydrodynamic performance. As the pitch ratio increases, hydrodynamic performance is also better. It is complex about the influence of area ratio on hydrodynamic. It may cause the change of other effective factors. Area ratio and skews has a little effect on hydrodynamic performance. It is different between having skews and no skews about hydrodynamic performance. After adding skews back, pressure distribution on blade is changed. Through the study of the geometrical parameters, we provide certain reference for the design of composite materials propeller.