微型潜血泵轴流式叶轮结构分析

Structure Analysis of Axial Flow Impeller of Micro Occult Blood Pump

目的:分析在长度小于20 mm,直径5 mm的高速微型潜血式轴流血泵内,不同形态叶轮对泵血液的损伤情况,找到最优叶轮结构。方法:运用计算流体力学(CFD)对一款微型潜血式轴流泵进行数值仿真,改变叶轮叶片数量(两片,三片,四片),分析血泵内的流场分布。通过研究其速度、压力和剪切应力场分布情况来分析血泵的水力性能以及对流道内血液的损伤情况。结果:数据结果显示,三种叶片NIH值分别为0.07,0.05,和0.08。结论:实验表明,三叶片式叶轮条件下,剪切应力小,NIH小,比较分析,三叶片式叶轮更适用于高速微型潜血式轴流血泵的叶轮设计方案。

Objective: To analyze the damage of different impellers to the blood in a high-speed micro-submersible axial blood pump with a length of less than 20 mm and a diameter of 5 mm, and to find the optimal impeller structure. Methods: Numerical simulation of a miniature submersible axial flow pump using Computational Fluid Dynamics (CFD) was performed to vary the number of impeller blades (two, three, and four) to analyze the flow field distribution within the blood pump. The hydraulic performance of the blood pump and the damage to the blood in the flow path are analyzed by studying its velocity, pressure and shear stress field distribution. Results: The data results showed that the NIH values for the three blades were 0.07, 0.05, and 0.08, respectively. Conclusions: Experiments show that the three-bladed impeller conditions, shear stress is small, NIH is small, comparative analysis, three-bladed impeller is more suitable for high-speed micro-submersible axial bleeder pump impeller design scheme.