Abstract
The swing scraper pump-motor, a novel positive displacement pump, combines compact structure, high efficiency, and strong adaptability for industrial applications. FSI (fluid–structure interaction) refers to the interaction between fluid dynamics and structural mechanics, where fluid flow affects the structure, and the structure's deformation influences the fluid flow. However, the complex internal flow and scraper–rotor coupling present challenges in performance evaluation and life prediction. This study conducts a computational investigation of flow field characteristics and fatigue behavior. Using particle-based XFlow, the transient internal flow is simulated at varying rotational speeds. Results indicate that increasing speed enhances flow velocity, while pressure distribution becomes more uniform at the rated speed of 1666 r/min. Although volumetric efficiency slightly decreases, it remains above 80%, confirming favorable hydraulic performance. Turbulence-induced unsteadiness causes pressure reduction in the high-pressure chamber at higher speeds. FSI is further analyzed by coupling XFlow with Workbench Dynamics, and stress-time data are imported into nCode DesignLife for fatigue assessment. The rotor exhibits a predicted life of about 8547 h, while the scraper shows only 4625 h, identifying it as the critical fatigue component. These findings provide guidance for structural optimization and predictive maintenance of the swing scraper pump, improving reliability, efficiency, and safety.
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