叶形仿生优化对离心血泵水力性能及溶血特性的影响-《中国医学物理学杂志》

文章信息/Info

Title:: Effects of blade shape bionic optimization on hydraulic performance and hemolytic characteristics of centrifugal blood pump

作者:: 程洁1; 2; 王慧鹏1; 范谦2; 李晶2; 1.江西理工大学机电工程学院，江西赣州 341000； 2.广东佛山联创工程研究生院，广东佛山 528305

Author(s):: CHENG Jie1; 2; WANG Huipeng1; FAN Qian2; LI Jing2; 1. School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China 2. Guangdong Foshan Lianchuang Engineering Graduate School, Foshan 528305, China

Keywords:: Keywords： centrifugal blood pump blade shape optimization bionic torsion trailing edge computational fluid dynamics

摘要:: 离心血泵的优化对于体外膜肺氧合的临床应用具有重要意义。本研究参考座头鲸在深海中作原地转身运动时其鳍状肢的流线形，重新设计血泵的叶片。采用计算流体动力学对血泵性能进行预测和评估；通过水力试验来验证数值计算的准确性；溶血预测模型采用渐进一致数值近似方法。仿真结果表明，叶片尾缘形状对出口隔舌处的流场分布和该区域的壁面剪应力分布均有显著影响；当叶片尾缘达到一定扭转角度时，叶片结构能较好地适应泵内的流场环境，但当扭转角度不足时，流场扰动反而会增大。与原模型相比，扭转角为20°的模型在转速为2 500 rpm、流量为5 L/min的工况下，扬程试验结果增加11.6%，水力效率提升3.1%，溶血指数下降40.1%。总的来说，具有一定扭转角度的仿生叶片尾缘结构可以提高半开放式离心血泵的性能。

Abstract:: The optimization of centrifugal blood pumps is of great significance for the clinical application of extracorporeal membrane oxygenation. The study redesigned the blades of the blood pump based on the streamlined shape of humpback whales flippers when they turn in place in the deep sea. Computational fluid dynamics is used to predict and evaluate blood pump performance, and hydraulic tests are carried out to verify the accuracy of numerical calculations. The hemolysis prediction model adopts the asymptotically consistent numerical approximation method. The simulation results indicate that the shape of the blade trailing edge has a significant impact on the flow field distribution at the outlet tongue and the wall shear stress distribution in this area. When the blade trailing edge reaches a certain torsion angle, the blade structure can better adapt to the flow field environment in the pump. However, when the torsion angle is insufficient, the flow field disturbance will increase. Compared with the original model, the model with a torsion angle of 20° increases the test results of the head by 11.6%, improves hydraulic efficiency by 3.1%, and decreased hemolysis index by 40.1% under the operating conditions with a rotation speed of 2 500 rpm and a flow rate of 5 L/min. In general, the bionic blade trailing edge structure with a certain torsion angle can improve the performance of semi-open centrifugal blood pump.