함정용 복합재료 프로펠러의 동역학적 모형시험 상사법에 대한 수치적 연구

Abstract

Unlike metallic marine propellers that consider only hydrodynamic scaling, composite propellers must consider hydroelastic scaling, incorporating blade deformation effects. This study numerically investigated the hydroelastic scaling of composite propellers using the Mach and Froude number scaling laws. A composite propeller was designed to replicate the KP458 propeller shape under design load conditions through FSI(Fluid-Structure Interaction) analysis based on the BEM(Boundary Element Method)–FEM(Finite Element Method) and CFD(Computational Fluid Dynamic)–FEM methods. To evaluate the performance of both model-scale and full-scale composite propellers, FSI analyses were performed using both the BEM–FEM and CFD–FEM approaches. Under open-water conditions, all the propellers exhibited identical deformation and performance. However, in self-propulsion analyses using CFD–FEM behind wake conditions, local deformation differences between full-scale and model-scale propellers emerged owing to wake effects, particularly in Froude number scaling. The Mach number scaling law is the most realistic approach as it more accurately approximates the full-scale analysis results than the Froude number scaling law, while allowing the use of the same material and stacking sequence as the full-scale composite propeller.