Dynamics and Modal Analysis of Slurry Pump Rotor Based on Bidirectional Fluid-Structure Interaction

Slurry pumps are widely used in complex media and harsh operating conditions due to their good transport performance and non-blocking characteristics. This paper takes a slurry pump as the research object, intending to analyze the impeller's structural characteristics and ensure the rotor's safe operation. By combining theoretical analysis and numerical simulation, the dynamic stress characteristics and vibration characteristics of the slurry pump structure are systematically analyzed using the bidirectional fluid-structure interaction research method, and the dry and wet modes of the pump rotor are analyzed. The results show that: the equivalent stress and deformation are the most severe under small flow conditions, and decrease with the increase of flow rate; the maximum equivalent stress occurs at the junction of the trailing edge of the suction surface of the blade and the back cover plate; the maximum deformation occurs at the intersection of the outlet of the impeller flow passage and the back cover plate; the wet mode has a lower inherent frequency than the dry mode; the rotor's inherent frequencies have some equal values of adjacent orders; the rotor's critical speed is $3408.4$ r/min, far higher than the rotor's actual speed of $1480$ r/min, and will not cause resonance.