| Centrifugal pump is a kind of universal hydraulic machinery. It is widely used inirrigation, petroleum chemical industry, city water supply and drainage, ship industry andother fields. Impeller is the key flow component of centrifugal pump. The interaction existsbetween complex internal flow and structure of impeller. The interaction has an appreciableeffect on structural properties of impeller, and causes the failure in the run easily. Therefore,its hydrodynamic properties and structural mechanics properties have a great influence on theoperation safety and reliability of centrifugal pump. Aiming at the safety and reliability ofcentrifugal pump, the study on structural characteristics of centrifugal pump based onfluid-structure interaction method has important theoretical significance and practical valuefor improving the operating characteristics, ensuring the reliability and the furtheroptimization of centrifugal pump.Research the fluid-structure interaction between the internal flow field and structure ofimpeller through the numerical simulation of internal flow and impeller structurecharacteristic analysis of centrifugal pump. The structural characteristics of FSI of impellerwere investigated. The main research content and features of the dissertation are as follows:(1) The3D models of whole flow domains and impeller were modeled by using UGsoftware. The fluid grid of whole flow domains was generated by using GAMBIT software,and the structure grid of impeller was generated by using ANSYS Workbench software.(2) The3D steady turbulent flow of whole flow domains was simulated under designflow rate conditions and off-design flow rate conditions by using standard k turbulencemodel and the FLUENT software. The distribution of velocity vector and pressure load underdifferent flow rate conditions was obtained. The internal flow of centrifugal pump underdifferent flow rate conditions was investigated. The calculation results laid the foundation forthe study on the structure characteristics of the impeller.(3) The static analysis of centrifugal impeller structure was carried out by themulti-physical fields simulation platform—ANSYS Workbench, with fluid-structureinteraction method. Under design conditions, the equivalent stress and total deformation ofthe impeller were calculated under different action conditions; the characteristics of thelargest equivalent stress and total deformation under different flow rate conditions wereinvestigated. The results have guiding significance for the safety and reliability of centrifugalpump.(4) Aiming at the vibration phenomenon of centrifugal pump in operation, the modalanalysis of centrifugal impeller structure was carried out by the multi-physical fields simulation platform—ANSYS Workbench. Comparative analysis of the natural vibrationcharacteristics of impeller in air and in water medium were obtained, the inherent frequencyand vibration type of impeller were obtained. The results can provide the modal parametersfor further dynamic analysis and provide a theoretical basis for the optimal design of theimpeller. |
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