基于fluent离心式血泵内流场仿真与结构优化-《中国医学物理学杂志》

文章信息/Info

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

作者:: 龚晓东1; 杨树进2; 刘祚时1; 1.江西理工大学机电工程学院，江西赣州 341000； 2.广东顺德创新设计研究院，广东佛山 528305

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

摘要:: 提高溶血性能，降低溶血率作为血泵性能优化的一个重要指标，对血泵的结构优化具有重要的指导意义。本文基于一款离心式血泵通过使用计算流体力学（CFD）技术，采用非结构化网格、N-S方程和标准K-ε湍流模型在fluent中模拟分析出不同工况下血泵流场内部的剪切力场、压力场等重要参数并根据叶轮流场数据分析，提出了4种不同的结构优化方案；并基于三维快速溶血预估模型计算出不同流量、不同叶轮结构下血泵的溶血性能。仿真结果显示：当叶片与叶轮径向夹角为45°，流量达到5 L/min、转速为2 100 r/min时，扬程为115 mmHg，溶血率达到0.022 1 g/100 L，优化后模型较原模型溶血率提升40.9%，满足人体泵血生理需求。实验结果显示：选用优化后结构进行实验分析，得到扬程的实验数据与仿真数据相互验证，进一步证实了该仿真结果的准确性。

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.