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目的优化儿童用碟形血泵的血液动力学性能。方法应用计算流体仿真技术(computational fluid dynamics,CFD)对儿童用碟形血泵内的流场进行数值模拟,通过分析数值计算结果对其产生的血栓和溶血现象进行系统的分析研究,根据流场分析结果对现有血泵结构方面的不足实施改进。结果选取2 500 rpm、3 000 rpm和4 000 rpm三个不同转速对血泵流场进行了CFD模拟,每个转速下选取5个不同的流量出口边界条件,仿真结果与实验数据吻合;血泵的增加效果良好,但在低转速区域叶片表面存在流动分离的情况增加。剪切力的最大值基本维持在100 Pa以内。结论该设计碟形血泵流体力学性能较好,流线控制较好,对血栓和溶血的控制理想。但有流叶分离的情况发生,有进一步改进的空间。
Objective To optimize the hemodynamic properties of disc-shaped blood pumps for children. Methods The computational fluid dynamics (CFD) was used to numerically simulate the flow field in a disc-shaped blood pump for children. The thrombus and hemolytic phenomena were systematically analyzed by analyzing the numerical results. According to the flow field The results of the analysis of the existing structure of the blood pump to implement improvements. Results The blood pump flow field was simulated by CFD at three rotational speeds of 2 500 rpm, 3 000 rpm and 4 000 rpm. Five different flow outlet boundary conditions were selected at each speed. The simulation results were in good agreement with the experimental data. Blood pump Of the increase effect is good, but in the low-speed region of the blade surface flow separation increases. The maximum shear force is basically maintained within 100 Pa. Conclusion The design of disc-shaped blood pump fluid mechanics better flow control is better, the control of thrombosis and hemolysis ideal. However, there is separation of the leaves occurred, there is room for further improvement.