两级轴流血泵CFD性能仿真

CFD Simulation of the Two-stage Axial Flow Blood Pump

为了降低血泵转速,提高其溶血性能,将血泵设计为两级轴流式结构,其中前级叶轮采用一元流动理论设计为螺旋轴流结构,后级叶轮采用流线法设计为传统轴流结构。利用计算流体力学(CFD)的方法,对血泵的扬程、流量及其内部血液的流场、应力等分布情况进行了仿真分析。结果表明:血泵最大应力主要出现在其入口和出口处,且后级叶轮在前级叶轮的影响下,其入口处的最大应力明显减小。在相同条件下,两级血泵与普通血泵相比,其最大应力可明显降低。

In order to reduce rotating speed and improve hemolytic performance of blood pump, the blood pump was designed as two-stage axial structure. The front impeller was designed to helico-axial structure by using one dimension flow theory and the rear im- peller was designed to traditional axial structure by using streamline design method. Computational fluid dynamics （CFD） simulation was applied to analyze the blood pump head, flow and distribution status of flow field, stress of blood in the blood pump. The results show that the maximum stress of blood pump appears in the inlet and outlet, besides, maximum stress of rear impeller inlet reduces significantly with the effects of front impeller. In the same conditions, the maximum stress of two-stage blood pump decreases significandy compared with ordinary blood pump.