Abstract

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Title:: Inner flow field simulation of centrifugal blood pump using fluent and structure optimization

Author(s):: GONG Xiaodong1; YANG Shujin2; LIU Zuoshi1; 1. School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China 2. Guangdong Shunde Innovative Design Institute, Foshan 528305, China

Keywords:: Keywords: optimization of blood pump hemolysis performance computational fluid dynamics technology hemolysis prediction model

Abstract:: Abstract: Reducing the hemolysis rate to improve hemolysis performance is an important index of blood pump performance optimization, which has important guiding significance for the structure optimization of blood pump. Based on a centrifugal blood pump, the unstructured grid, N-S equation and standard K-ε turbulence model of computational fluid dynamics are used to simulate and analyze the shear force field, pressure field and other important parameters in the blood pump flow field under different working conditions in fluent. According to the data analysis of impeller flow field, 4 different structure optimization schemes are proposed, and the hemolysis performances of blood pump with different flow rates and impeller structures are calculated based on the three-dimensional fast hemolysis prediction model. The simulation results show that when the radial angle between blade and impeller is 45°, with flow rate of 5 L/min and speed of 2 100 r/min, the head is 115 mmHg and the hemolysis rate reaches 0.022 1 g/100 L. The hemolysis rate of the optimized model is 40.9% higher than that of the original model, which meets the physiological needs of human blood pumping. The optimized structure is used to carry out an experimental analysis, and the experimental data and the simulation data of the head are mutually validated, which further verifies the accuracy of the simulation results.