摘要
利用CFD软件对采用一元理论的方法所设计的无回流区和有回流区2种离心式心脏泵进行数值模拟,考察和分析人工心脏泵叶轮内部流场的分布,揭示叶轮内部流动的特殊规律和流动机理.通过数值模拟得到心脏泵流道内的切应力、速度和压力分布云图,分析2种模型对血栓和溶血的影响.结果表明,有回流区离心式心脏泵模型内部流场要比无回流区离心式心脏泵模型内部流场更符合血液动力学的要求,对血细胞的破坏更小,具有更好的抗血栓和溶血性能.
Two cardio-pumps with recirculation region and anti-recirculation region,which were designed with one-dimensional theory,were numerically simulated with software CFD,the internal flow field in the impeller of these pumps was analyzed,and the special flow pattern and flow mechanism in the impeller were revealed.The nepho-grams of shear stress distribution,velocity distribution,and pressure distribution in the impeller were obtained with numerical simulation and the influence of the two pump models on thrombus and hemolysis was analyzed and compared between the two pump models.The results showed that： the internal flow of cardio pump with recirculation region met better the requirements of the hemo-dynamics than the cardio-pump with anti-recirculation region,the destruction of blood cells was less,and the performances of anti-thrombus and anti-hemolysis were better.
出处
《兰州理工大学学报》
CAS
北大核心
2012年第5期53-57,共5页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51079066)
关键词
离心式心脏泵
数值模拟
切应力
流场
centrifugal cardio-pump
numerical simulation
shear stress
flow field
