离心式磁悬浮血泵内部流场数值仿真

Numerical Simulation of Internal Flow Field for Blood Pump of Centrifugal Maglev

目的探讨离心式磁悬浮血泵内部流场和血液流动性能,为离心式磁悬浮血泵的结构设计提供重要依据。方法利用计算流体动力学分析软件,采用K-ε模型、动网格技术和用户自定义函数(user defined function,UDF)技术,开展离心式磁悬浮血泵内部流场的三维数值模拟,分析离心式磁悬浮血泵流道的压力、流速分布,探索血液流量、血液压力与叶轮转速的关系。结果该血泵叶轮转速在1800～2000 r/min时,进出口压差为110～120 mmHg,出口流量在4.69～5.28 L/min范围内变化,可以满足人体血液循环需求。结论离心式磁悬浮血泵叶轮参数对其流场特性具有较大影响,可通过对叶轮结构的优化改善血泵的血流特性,进而节约成本,缩短研发周期。

Objective To explore the internal flow field and hemokinesis efficiency in blood pump of centrifugal maglev to provide an important basis for structure design of blood pump of centrifugal maglev. Methods A three-dimen- sional numerical simulation for blood pump of centrifugal maglev was performed, which based on computational fluid dy- namics （CFD） method and used K-e model, dynamic mesh and user defined function （UDF） technologies, to analyze the pressure and velocity distribution for blood pump of centrifugal maglev, and to explore the relationships between blood flow and blood pressure with impeller speed respectively. Results The pressure difference of export and import was 110- 120 mmHg, the blood flow was at 4.69-5.28 L/min when the impeller speed of blood pump was 1800-2000 r/min, which could meet blood needs. Conclusion The impeller parameters of blood pump can affect the flow field characteristics, so the blood flow characteristics of blood pump can be improved by optimizing the impeller structure in order to save costs and shorten the development cycle.