直式叶轮几何参数对离心式血泵流动及溶血性能影响的数值研究
Numerical study of the effect of geometrical parameters of straight impellers on the flow and hemolysis performance of centrifugal blood pumps
黄冬梅 1熊思恒 1肖媛 1王金阳 2崔国民1
作者信息
- 1. 上海理工大学 能源与动力工程学院 上海市动力工程多相流动与传热重点实验室(上海 200093)
- 2. 张家港海陆热能设备有限公司(江苏张家港 215600)
- 折叠
摘要
血泵中剪切应力超过阈值时红细胞会被破坏,进而引发患者出现溶血.离心式血泵叶轮结构设计对血泵的水力特性及溶血特性有着显著影响.基于此,本文采用多相流方法对离心式血泵进行数值模拟,探究了具有不同叶片数量及偏转角叶轮形式血泵的性能,分析了血泵的流场特性、水力性能以及溶血性能.数值模拟结果表明:血泵主要在叶轮及隔舌处出现了红细胞集聚现象及较大的切应力,导致此处溶血急剧增加;在一定范围内增加叶片数会提升血泵水力性能,同时也会增加溶血风险;增加叶片偏转角有助于提升血泵溶血性能,在叶片数较多时更为明显.本文研究结果可为离心式血泵的结构改进及性能改善提供参考.
Abstract
Red blood cells are destroyed when the shear stress in the blood pump exceeds a threshold,which in turn triggers hemolysis in the patient.The impeller design of centrifugal blood pumps significantly influences the hydraulic characteristics and hemolytic properties of these devices.Based on this premise,the present study employs a multiphase flow approach to numerically simulate centrifugal blood pumps,investigating the performance of pumps with varying numbers of blades and blade deflection angles.This analysis encompassed the examination of flow field characteristics,hydraulic performance,and hemolytic potential.Numerical results indicated that the concentration of red blood cells and elevated shear stresses primarily occurred at the impeller and volute tongue,which drastically increased the risk of hemolysis in these areas.It was found that increasing the number of blades within a certain range enhanced the hydraulic performance of the pump but also raised the potential for hemolysis.Moreover,augmenting the blade deflection angle could improve the hemolytic performance,particularly in pumps with a higher number of blades.The findings from this study can provide valuable insights for the structural improvement and performance enhancement of centrifugal blood pumps.
关键词
离心式血泵/多相流/溶血预测/数值模拟Key words
Centrifugal blood pump/Multiphase flow/Hemolysis prediction/Numerical simulation引用本文复制引用
基金项目
国家自然科学基金项目(21978171)
国家自然科学基金项目(51976126)
中国博士后科学基金资助项目(2020M671171)
出版年
2024
NETL
NSTL
万方数据