| Cardiovascular assist device has been used to treat heart disease or hearttransplant bridge. Due to their simple structure, small size and low powerconsumption, rotary axial blood pumps have been rapidly developed during the lastdecade. In the area of axial blood pump designing, the activity and effectiveness ofcomputational fluid dynamics has been more and more evident. Designers utilize it toaccurately predict the hydraulic property of a blood pump, displaying the flow fieldfor analysis. Based on the simulation results, biocompatibility of a blood pump can beevaluated properly. Numerical simulations have replaced the traditional vitro and vivoexperiments to a large extent, saving great amount of time and funds.As a cardiac assist device (VAD), axial flow blood pump has drawn more andmore countries’ attention. However, the traditional axial flow blood pump hemolysisand blood coagulation has been hindering the wider use of blood pumps.The bloodpump based on the design of the hollow axis blood pump can solve the the problemof high hemolysis totally. In this paper, the author designed a hollow axis blood pump,which is constructed of high-quality hexahedral meshes, and analyzed the flow fieldby CFX,and then compared the performance of different structure of the blood pumprotor.The thesis includes the following work:1． Modeling of a blood pump, creating the three dimensional model of thepump by Proe Wildfire and CATIA, then importing it into ICEM-CFD, generatinghigh quality multi-blocking hexahedron grid.2． Commercial CFD software ANSYS CFX was used to calculate Hydraulicproperty and hemolytic property of the blood pump driving blood under differentworking conditions. A variety of special flow structures inside the blood pump andtheir liaison with hemolysis and thrombosis were revealed.3． Optimized the rotor bladesin a small areain order to guide the blood pumpdesign work. |
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