In order to explore the feasibility and effectiveness of the weaker fluid-solid coupling calcu-lation in the propulsion pump,the static strength,dynamic strength and vibration mode of a rotor were calculated and analyzed.Firstly,the steady and transient flow fields of the pump were calculated by CFD to extract the hydrodynamic load data.And then,the steady and transient flow fields were calculated by weaker fluid-solid coupling method to extract the static and dynamic stresses and the maximum deformation of the structure.Finally,the rotor modal analysis under fluid-structure cou-pling condition was completed,and the modal frequency and characteristic mode were obtained.The results show that the maximum stress of rotor blade is at the root and the maximum displacement is near the edge of tip section,that the stress of rotor blade meets the requirement of material strength,and the deformation is less than the tip clearance,and that the mode shape of wet mode is almost the same as that of dry mode,but the amplitude of mode shape and mode frequency decrease obviously.The fluid-solid weak coupling calculation method can be used in the structural design and vibration harmonic response analysis of pump rotor,which is helpful for related design improvement.
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