Analysis of Transient Flow Field in a Medical Composite Plunger Pump Based on CFD

This study introduces a medical composite plunger pump and elaborates on its structure and working principle in detail. To investigate the dynamic characteristics of the fluid during the suction and exhaust phases of the medical composite plunger pump, a gap model was constructed based on dynamic mesh technology, enabling coupled simulation of the flow field within the pump and the motion of the check valve spool. Through numerical simulation, the overall flow field velocity, pressure distribution, and pulsation characteristics of the plunger pump were analyzed under a motor speed condition of 140 r/min. The resulting velocity and pressure contour plots of the fluid domain over time facilitated a fluid-structure interaction analysis of the flow field variations within one cycle of the medical composite plunger pump. This approach provides a viable method for further exploring the flow field characteristics of the medical composite plunger pump and offers data support for subsequent optimization of its operating parameters and enhancement of its performance.