蜗壳断面面积变化对离心式血泵流动特性和溶血性能的影响  

The Impact of Changes in Volute Cross-Sectional Area on Flow Characteristics and Hemolytic Performance of Centrifugal Blood Pumps

作　　者：曹展硕 段欢欢[1] 连起龙 肖义平 崔国民[1] 王金阳 CAO Zhanshuo;DUAN Huanhuan;LIAN Qilong;XIAO Yiping;CUI Guomin;WANG Jinyang(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Zhangjiagang Hailu Thermal Energy Equipment Co.,Ltd.,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]张家港海陆热能设备有限公司,江苏张家港215600

出　　处：《医用生物力学》2025年第1期41-48,共8页Journal of Medical Biomechanics

基　　金：国家自然科学基金项目(21978171,51976126)。

摘　　要：目的 通过设计6种不同蜗壳结构,探究蜗壳断面面积变化对离心式血泵流动特性和溶血性能的影响。方法 采用计算流体力学及拉格朗日法对不同蜗壳结构的血泵进行流动特性研究及溶血预测。结果 在流动特性方面,环型蜗壳血泵水力性能最差,S型蜗壳水力性能最佳,比环型蜗壳提升35.29%。部分蜗壳在螺旋起始段(0°~90°)出现了滞止区;出口处(270°~360°)较大的滞止区中存在回流。在溶血方面,下凹型蜗壳血泵的溶血指数(hemolysis index, HI)最高,为9.59×10^(-4);而环型蜗壳血泵的HI最低,比下凹型蜗壳减少了71.85%。结论 减小蜗壳螺旋起始段和出口处的面积变化梯度可以避免流动滞止区和回流出现。造成HI较高的原因是红细胞暴露在高剪切应力下的时间较长。研究结果为离心式血泵蜗壳结构设计及优化提供了理论基础。Objective To investigate the impact of variations in volute cross-sectional area on the flow characteristics and hemolytic performance of centrifugal blood pumps by designing six volute structures.Methods Computational fluid dynamics and the Lagrangian method were used to analyze flow characteristics and predict hemolysis in blood pumps with different volute designs.Results The annular volute pump showed the poorest hydraulic performance,while the hydraulic performance of the S-shaped volute was the best,which was improved by 35.29%compared to that of the annular volute.Some volutes experienced stagnation zones at the helical inlet(0°-90°)and significant backflow at the outlet(270°-360°).The downward concave-shaped volute had the highest hemolysis index(HI),i.e.,9.59×10^(-4).Meanwhile,the HI of the annular volute was the lowest,which was 71.85%less than the concave-shaped volute.Conclusions Reducing the gradient of the area variation at the helical inlet and outlet can prevent flow stagnation and backflow.A higher HI arises due to the prolonged exposure of red blood cells to high shear stress.This study provides a theoretical basis for designing and optimizing volute structures of centrifugal blood pumps.

关 键 词：离心式血泵 蜗壳断面 流动特性 拉格朗日 溶血 

分 类 号：R318.01[医药卫生—生物医学工程]