Abstract
The load dependent deformation responses and complex failure mechanisms of self-adaptive composite propeller blades make the design, analysis, and scaling of these structures nontrivial. The objective of this work is to investigate and verify the dynamic similarity relationships for the hydroelastic response and potential failure mechanisms of self-adaptive composite marine propellers. A fully coupled, three-dimensional boundary element method-finite element method is used to compare the model and full-scale responses of a self-adaptive composite propeller. The effects of spatially varying inflow, transient sheet cavitation, and load-dependent blade deformation are considered. Three types of scaling are discussed: Reynolds scale, Froude scale, and Mach scale. The results show that Mach scaling, which requires the model inflow speed to be the same as the full scale, will lead to discrepancies in the spatial load distributions at low speeds due to differences in Froude number, but the differences between model and full-scale results become negligible at high speeds. Thus, Mach scaling is recommended for a composite marine propeller because it allows the same material and layering scheme to be used between the model and the full scale, leading to similar 3D stress distributions, and hence similar failure mechanisms, between the model and the full scale.
Highlights
In recent years, advanced composite materials have become an increasingly popular alternative to traditional metallic alloys for aerospace and marine applications, including rotors such as propellers and turbines
Mach scaling allows the same material and layering scheme to be used between the model and full-scale propellers [27]
A previously validated 3D boundary element method-finite element method (BEM-FEM) solver is used to compare the model (1/17-scale) and full-scale hydroelastic responses and potential failure mechanisms of a self-adaptive composite propeller designed for a naval combatant
Summary
In recent years, advanced composite materials have become an increasingly popular alternative to traditional metallic alloys for aerospace and marine applications, including rotors such as propellers and turbines. The load-dependent deformation responses and complex failure mechanisms of composite blades make the design, analysis, and scaling of these structures nontrivial. In order to predict the full-scale, load-dependent deformation response and potential failure mechanisms of self-adaptive composite marine rotors, appropriate hydroelastic scaling laws are needed. Young [27] derived and validated dynamic hydroelastic similarity relations for self-adaptive composite rotors and demonstrated the importance of material scaling to ensure similar load-deformation characteristics. The objectives of this work are to investigate and to verify the dynamic similarity relationships for the hydroelastic response and potential failure mechanisms of selfadaptive composite marine propellers. A fully coupled, threedimensional (3D), boundary element method-finite element method (BEM-FEM) is used to compare the model and full-scale responses of a self-adaptive composite propeller designed for a naval combatant.
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