Numerical Analysis Of Axial Spiral Impeller Blood Pump Output Character

Cardiovascular disease has become one of the main causes of death, and there is about 1/3 of death cases associated with heart disease all over the world. In China, hundreds of thousands of people die of heart disease each year. At present, the main therapy is heart transplantation. With the rapid development of medicine, the main cause to restrict heart transplantation is not the rejective reaction, but that the shortage of donor organs becomes a global medical problem.To solve this problem, people start to develop the alternatives of natural human heart, total artificial heart (TAH) and ventricular assist devices (VAD). Blood pump, which is the core part of TAH and VAD, has developed very rapidly in recent year, and there are several TAH and VAD coming into the clinical application stage. Computational fluid dynamics (CFD) has played an important role in the research of blood pump. By using CFD simulation, the output character of pump with different structure and size can be compared easily, so it can save lots of money and time for making prototype. At the same time, the flow field can be studied by the CFD simulation, which can be very difficult to complete by conventional measurement technology.The major content of this paper is:(1)The history of the development history of the artificial heart is introduced, and the status of TAH and VAD at home and abroad is summarized. The application of CFD technology in research of blood pump is presented in details.(2)The CAD model of axial conical spiral impeller pump is built by using Pro/E, and then it is meshed after proper treatment. After comparison and analysis, the SIMPLEC algorithm and k ?εtwo-equation turbulence model are chosen in simulation.(3)Simulation results with different revolution, different blade number and different helix angle of blade are compared separately. The relation between output flux, output pressure and rotate speed, blade number, helix angle of blade is got.(4)The pressure distribution of pump model which output character already meets the request is analyzed. It can be found that the area between rotor and outlet stator is the place where pressure varies greatly. This variation is harmful to the blood cell. The structure of pump is amended to improve the flow field.