Abstract:
Objectives To address the lightweight requirements and vibration reduction demands of pump-jet propulsors, this study proposes the application of carbon fiber reinforced composite materials to propulsor ducts.
Methods First, a CFD/FEM bidirectional fluid-structure interaction numerical method was established to obtain the structural responses under hydrodynamic excitations. This enabled systematic analysis of structural deformation effects on both hydrodynamic performance and shafting excitation characteristics. Subsequently, a duct model was developed to investigate the composite material's impacts on hydrodynamic performance, vibration transmission mechanisms, and structural responses.
Results Composite material's ducts exhibited structural deformation magnitudes of 10-7 m, demonstrating negligible influence on hydrodynamic performance. Natural frequencies of the first four wet modes showed 65.3-80.2% reduction compared to corresponding dry modes. Vibration analysis revealed a 1.0533 dB reduction in total acceleration level at stator-duct connections compared to bronze alloy ducts, though some vibration performance rebound was observed under internal surface excitation.
Conclusions The study strongly confirms the role of composite materials in lightweight design, vibration reduction, and performance optimization, providing a basis for the design of propulsors.
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