Abstract

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

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

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.