复合材料转子泵喷推进器的 结构响应及流噪声特性研究

[Objective] Composite materials offer advantages such as low weight, corrosion resistance and a high damping ratio. To enhance the overall performance of underwater vehicles, this study investigates the characteristics of a composite rotor pump-jet propulsor. [Method] Firstly, by combining computational fluid dynamics (CFD) and the finite element method (FEM), a two-way fluid-structure interaction method and a flow-induced noise prediction method were established based on FW−H equation for the composite rotor pump-jet propulsor. The open water performance, structural response and flow-induced noise characteristics of the composite rotor pump-jet propulsor were then analyzed under various operating conditions. [Results] The results show that with the increase in advance speed coefficient, the structural deformation and stress and strain levels of the composite pump-jet propulsor rotor decrease. The overall sound pressure level of flow-induced noise first decreases and then increases, reaching a minimum of 87.60 dB at J = 0.8. Compared with a traditional aluminum alloy pump-jet propulsor, the rotor deformation of the model-scale composite pump-jet propulsor is minimal. It does not affect the hydrodynamic shape or cause significant changes in hydrodynamic performance. The flow-induced noise of composite pump-jet propulsor is reduced slightly at specific frequencies, and the overall reduction in sound pressure level is also relatively limited. [Conclusion] These research findings provide a theoretical basis for the comprehensive performance optimization of pump-jet propulsors, including weight reduction and noise control design.