Abstract:In order to truly reflect the rotor vibration in water, the rotor modal of residual heat removal pump was calculated by ANSYS WORKBENCH software based on the fluid-structure interaction kinetics. The modal of rotor and blade were both calculated in air and in water. The natural frequency,mode shape and amplitude were obtained, and the influence of the water medium on rotor vibration performance was discussed. The results show that the water medium has little influence on the low order modes, but significantly reduces the impeller modes. The natural frequency of blade in water has a decline of between 15.9%-49.7% compared to the one in air, mode shape is similar but the amplitude is significantly lower. It is more likely to resonance under the incentive of flow divorced,rotor stator interaction and other excitation force; The decline of the natural frequency has no law, different order comes with different decline. The rotor vibrates in the water, under the impact of water pressure, viscous force and inertial force, the modal result changes. The modal distribution of rotor in water is simulated, which provides a theoretical basis for the prediction of pump dynamic performance and design improvements.
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