Objective To improve the blood flow regime and hemolysis performance for two-direction hydrodynamic suspension blood pump of artificial heart,the structure of the impeller inlet was changed,and we used computational fluid dynamics method to simulate and analyze the flow field of blood pump.Methods Considering hemolysis performance of the blood pump,we used FLUENT6.3 software to analyze the flow field of centrifugal blood pump based on N-S equations and k-ε standard double-equations turbulent model.Then,the influence analysis of the flow field velocity with the impeller inlet structure change was proceeded as the impeller rotating speed in design condition,the relationship between maximum velocity and hemolysis level was also analyzed,and the pump structure was optimized.Results By optimization,the disorder phenomenon of blood pump flow field was improved.The shear stress and exposure time which influenced the hemolysis were decreased,hemolysis performance was improved.Furthermore,the maximum flow velocity had the potential to show flow field as a visual indicator under design condition in the process of optimization.Conclusions Numerical analysis of this research accumulated certain experience to design centrifugal blood pump with twodirection hydrodynamic suspension.%目的 应用计算流体动力学方法(computational fluid dynamics,CFD)对离心式双向液力悬浮人工心脏血泵流场进行仿真分析,通过改进叶轮入口结构来改善血液在血泵的流动状态,从而提升其抗溶血性能.方法 从影响血泵溶血性能的角度考虑,基于N-S方程和k-ε标准双方程湍流模型,应用软件FLUENT6.3对离心式人工心脏血泵流场进行数值模拟,分析在设计工况下,叶轮入口处的结构变化对泵内流场的影响,以及流场中最大速度与溶血水平之间的关系,并根据流场分析结果对血泵叶轮入口进行优化.结果 经过优化,血泵内流场紊乱现象得到改善,影响溶血值的切应力和曝光时间均有所降低,溶血性能得到改善.同时,对于离心式双向液力悬浮血泵,在设计工况下,其流场中最大速度有作为流场优化过程中的直观指标参数的潜力.结论 该研究的仿真分析可为离心式双向液力悬浮人工心脏的设计积累一定经验.
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