| This project conducts numerical simulation of spiral centrifugal blood pump designed according to one dimension theory, analyzes the blood pump’s external characteristics and internal flowing characteristics under six conditions. Through utilizing graphs and letters, comprehensive elaboration of the spiral centrifugal blood pump’s characteristics is given; based on analysis of such information through utilizing CFD software, the distribution chart and flow chart of its pressure field, velocity field, shear stress field and velocity vector, and its external characteristic curve are obtained. This project analyzes and compares the performance of blood pump in different situations, and lay a good foundation for the development of intelligent pump blood.A comprehensive analysis of both foreign and domestic blood pump studies has been conducted; bold attempts to solve the bottle neck of blood pump study has been made:adopting magnetic levitation design for preventing blood loss caused by friction of sealed box, setting the reflux hole to improve the blood pump’s internal flow characteristics in order to effectively prevent the flow dead zones.Through using Pro/E software, solid modeling of the designed blood pump has been conducted, and then, through using ICEM software, meshing of the model has been conducted and the impact of grid over computing solution has been briefly described.Through importing msh file into FLUENT (Fluid numerical simulation software), setting fluid parameters and boundary conditions, adopting RNG turbulence model and adopting SIMPLEC pressure coupling algorithm for solving equations, numerical simulation of spiral centrifugal blood pump’s flow field has been achieved.Simulations of six different conditions have been conducted and external characteristics in each condition have been obtained. Then, numerical simulations of six best working conditions have been conducted; their internal flow characteristics have been analyzed; and, the blood pump’s influence over blood under each condition has been expounded.The numerical simulation results show that, by adjusting the speed of the blood pump, intelligent adjustment of the blood pump can be achieved for the purpose of meeting the physical needs of the human body under different conditions. By analyzing the distribution of shear stress field and velocity vector, it can be found that the spiral centrifugal blood pump has a good performance in terms of blood loss, which is in line with the spiral centrifugal pump’s characteristics of gentle conveying, wide efficient area, flat power curve, etc.The design of the blood pump in this project is conducted on the premise of that the power control and positioning control are able to meet specific requirements. However, such issues could not be ideally handled and solved in practice. Therefore, the reference value of the project is confronted with certain limitations. |
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