兩級軸流血泵結(jié)構(gòu)設(shè)計與性能仿真
[Abstract]:Blood pump is a kind of small pump which can completely or partially replace the function of heart pump and maintain normal blood circulation. It is of great significance to patients with heart disease. At present, the blood pump is mainly implantable micro rotating impeller structure, in which axial flow structure is the most representative. The working principle and volume of the axial bleeding pump determine that it needs a very high rotational speed to meet the blood pressure required by the human body, but the higher speed of the pump can destroy the blood more greatly and form hemolysis easily. In order to solve this problem, a two-stage axial flow structure blood pump design scheme is presented in this paper. The former impeller is designed as a spiral structure by univariate flow theory, and the rear impeller is designed as a traditional axial flow structure by streamline method. The specific work of this paper is as follows: (1) the structure of two-stage axial bleeding pump is designed according to the design scheme, which mainly includes the design of rotor head and tail, the selection and design of front and rear impellers. (2) calculating the space coordinate points of each airfoil of the rear stage impeller by writing Matlab program, and determining the angle correction value of the airfoil and the relative position of the front and rear impeller. Combined with the powerful drawing function of Pro/E, the accurate 3D model of two-stage blood pump is established. (3) the 3D model is meshed with Gambit, and then the mesh model is simulated by Fluent. Finally, according to the simulation results, the distribution of shear stress, pressure, velocity and turbulence of the two-stage blood pump are analyzed in detail. The results show that under the same conditions, the maximum shear stress of the two-stage blood pump is obviously lower than that of the single-stage blood pump, which can effectively reduce the formation of hemolysis.
【學(xué)位授予單位】:武漢科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2012
【分類號】:TH311
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