关键词: 水下航行器, 复合材料, 负体积, 转子, 流固耦合

Abstract: This paper focuses on the fluid-structure interaction (FSI) phenomena occurring during the operation of the composite rotor blades of the underwater vehicle thruster. The bidirectional FSI numerical method based on the finite element method (FEM) in ABAQUS and the computational fluid dynamics (CFD) method in STAR CCM+ has been used to calculate and analyze the open water performance, pressure distribution, blade deformation and stress of the composite blades in unsteady flow field under different advance coefficients. In addition, two solutions for negative volume mesh are proposed. The results show that the FSI effect on the composite rotor can cause partial thrust loss, and the vibration frequency of the composite blades in the FSI process mainly concentrates near the first-order blade frequency. When the advance coefficient is lower, it is also observed that the larger the axial load on the blades, the greater the axial deformation, and vice versa. The maximum stress caused by the FSI effect occurs on the root of the pressure side of the blade and the smaller the advance coefficients, the greater the maximum stress. The FSI effect is significant under low advanced coefficients. Both solutions can effectively solve the negative volume mesh problem.

Key words: underwater vehicle, composite material, negative volume, rotor, fluid-structure interaction