Luo Jiping, Huang Diangui, Xu Bin
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P.R.China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2020 Apr 25;37(2):296-303. doi: 10.7507/1001-5515.01904010.
The high rotational speed of the axial flow blood pump and flow separation of the centrifugal blood pump are the main causes for blood damage in blood pump. The mixed flow blood pump can effectively alleviate the high rotational speed and the flow separation. Based on this, the purpose of this study is to explore the performance of the mixed blood pump with a closed impeller. A mixed flow blood pump with closed impeller was studied by numerical simulation in this paper. The flow field characteristics and the pressure distribution of this type of blood pump were analyzed. The hydraulic performance of the blood pump and the possible damages to red blood cells were also discussed. At last, pump performance was compared with the mixed flow blood pump with semi-open impeller. The results show that the mixed flow blood pump with close impeller studied in this paper can operate safely and efficiently with a good performance. The pump can reach the pressure head of 100 mmHg at 5 L/min mass flow rate. Flow in the blood pump is uniform and no obvious separation or vortex occurs. Pressure distribution in and on the impeller is uniform and reasonable, which can effectively avoid the thrombosis of blood. The average mean value of hemolysis index is 4.99 × 10 . The pump has a good biocompatibility. Compared with the mixed flow blood pump with semi-open impeller, the mixed flow blood pump with closed impeller has higher head and efficiency, a smaller mean value of hemolysis index prediction, a better hydraulic performance and the ability to avoid blood damage. The results of this study may provide a basis for the performance evaluation of the closed impeller mixed flow blood pump.
轴流血液泵的高转速以及离心血液泵的流动分离是血液泵中血液损伤的主要原因。混流血液泵能够有效缓解高转速和流动分离问题。基于此，本研究的目的是探究闭式叶轮混流血液泵的性能。本文通过数值模拟对闭式叶轮混流血液泵进行了研究。分析了该类型血液泵的流场特性和压力分布。还讨论了血液泵的水力性能以及对红细胞可能造成的损伤。最后，将泵的性能与半开式叶轮混流血液泵进行了比较。结果表明，本文所研究的闭式叶轮混流血液泵能够安全高效运行，性能良好。该泵在质量流量为5 L/min时可达到100 mmHg的压头。血液泵内的流动均匀，未出现明显的分离或涡旋现象。叶轮内部及表面的压力分布均匀且合理，可有效避免血液形成血栓。溶血指数的平均均值为4.99×10 。该泵具有良好的生物相容性。与半开式叶轮混流血液泵相比，闭式叶轮混流血液泵具有更高的扬程和效率，溶血指数预测均值更小，水力性能更好，且具有避免血液损伤的能力。本研究结果可为闭式叶轮混流血液泵的性能评估提供依据。
