北京生物医学工程

基于CFD技术的Sarns离心式血泵流动特性分析

Flow characteristics in Sarns centrifugal blood pump based on computational fluid dynamics technology

作者：程云章朱莉花张伟国

单位：上海理工大学医疗器械与食品学院(上海 200093)

分类号：

出版年·卷·期（页码）：2012·31·2（111-116）

摘要：

目的应用专业计算流体动力学(computational fluid dynamics,CFD)分析软件FLUENT，对一种具有长短叶片的Sarns离心式血泵的内部流场进行三维数值模拟。方法利用Solidworks软件对Sarns型血泵进行三维建模，然后对所建模型网格处理，通过选取标准κ-ε湍流模型和SIMPLE算法，具体分析了内部流动状态、压力分布、壁面剪切力等流场特性。结果结果表明，该离心泵内部流场分布较不匀，叶片及血泵出口处有回流和旋涡现象，剪切力大小基本处于致红细胞破碎的临界状态之下，高转速下剪切力最大，主要分布在叶轮区域，但暴露时间极短，基本满足血液生理要求。结论该研究为Sarns血泵的进一步优化提供了理论基础。

Objective To simulate the three-dimensional internal flow field of a Sarns blood centrifugal pump with long and short blades by using computational fluid dynamics (CFD) software FLUENT. Methods We used the software Solidworks to build a three-dimensional model and selected the standard κ-ε turbulence model and the SIMPLE algorithm to analyze the flow characteristics of the internal flow status,pressure distribution and wall shear force. Results The analysis result demonstrated that there were several deficiencies in this pump,such as uneven velocity distribution,partial backflow and whirlpool between the blades and near the outlet of the pump. The shear stress distribution was under the critical state of breaking red blood cells and the maximum value of shear stress appeared in the impeller area under high-rotational speed. As the exposure time was short,the shear stress distribution could basically meet the physiological requirements of blood. Conclusions This research offered a theoretic basis for the further optimization of Sarns blood pump.

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