Study On Fluid-structure Interaction Characteristics Of Composite Marine Propeller

As the main propulsion device of ship, the propeller is more efficientthan other propulsion devices.Traditionally, marine propellers are made of nickel-aluminum-bronze ormanganese-aluminum-bronze. However, composite propeller is researchedby many scholars in recent years. In this thesis, a fluid-structure interactionmethod for composite propeller is presented.In chapter Ⅲ, the detached eddy simulation (DES) and the Reynoldsaveraged Navier-stokes simulation (RANS) are used to calculate thehydrodynamic performance of marine propellers. The results showed thatthe DES method is more accurate than using RANS method when thepropellers work in low advanced coefficients The DES method is moresuitable to calculate the complex flow around the propeller. However, thereare few differences between DES method and RANS method when thepropeller is not working in large detached flows. Moreover, the DESmethod can obtain better flow details than RANS method.In chapter Ⅳ, the CFD and FEM coupling method is applied to study the unsteady fluid-structure interaction（FSI）of the compositepropeller VP1304in a viscous flow. The three different stacking sequencesfor the propeller are designed. The effect of stacking sequence on pressureprofile, hydrodynamic and structure performances are analyzed. Theresults show that the hydrodynamic performance of composite propeller isapproximately the same as their metallic counterparts. However, they offerweight reduction due to their smaller material density. In order to get largerdeformation of propeller blade, a high skew composite propellerDTNSRDC4383are chosen. Balanced and orthogonal symmetric stackingsequences are taken into account. The FSI method is used to analyze theeffect of stacking sequence on hydrodynamic and structure performance.The difference between the two sequences are compared and the resultsshow that the hydrodynamic performance of the two compositepropellers are better than their metallic counterparts and different stakingsequence have different influences on the propeller performance.