轴流血泵的数值仿真与结构改进
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摘要
轴流血泵体积小、结构简单、易植入等优点,成为人工心脏的热点研究。作者设计了一种轴流式血泵,运用RNGκ-ε湍流模型的数值模拟方法分析血泵流场分布,利用计算流体力学(CFD)技术对血泵内部流场进行数值模拟。分析计算求得血泵流场的压力、速度,切应力等参数分布情况。总结血泵流场容易出现溶血和形成血栓的区域,以此为依据完成血泵结构的改进。结果表明:和原血泵相比,改进后的血泵流量输出性能得到提高,血泵的溶血概率降低,形成血栓的区域减小。
Due to the small size,the relatively simple structure,and easily implanted to the body,etc.,Axial Blood Pump has become research focus of artificial heart. First,an axial blood pump is designed. Then RNG κ-ε turbulence model of the numerical simulation method was used for analysis flow field distribution in blood pump,and Computational Fluid Dynamics( CFD) technology was used to simulate the internal flow field of Blood Pump. The distribution of pressure,velocity and shear stress effects were gotten through calculating analysis. Finally,the areas that hemolysis and thrombus easily to appear were summarized,and the structure of blood pump was improved according to it. The results show as compared with the original blood pump,it has a better flow output capability,and the probability for hemolysis and thrombus formation areas are lowered in the improved blood pump.
Due to the small size,the relatively simple structure,and easily implanted to the body,etc.,Axial Blood Pump has become research focus of artificial heart. First,an axial blood pump is designed. Then RNG κ-ε turbulence model of the numerical simulation method was used for analysis flow field distribution in blood pump,and Computational Fluid Dynamics( CFD) technology was used to simulate the internal flow field of Blood Pump. The distribution of pressure,velocity and shear stress effects were gotten through calculating analysis. Finally,the areas that hemolysis and thrombus easily to appear were summarized,and the structure of blood pump was improved according to it. The results show as compared with the original blood pump,it has a better flow output capability,and the probability for hemolysis and thrombus formation areas are lowered in the improved blood pump.
引文
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[3]张岩,薛嵩,桂幸民,等.运用三维数值模拟对人工心脏轴流血泵的设计和改进[J].中国生物医学工程学报,2007,26(1):35-41.ZHANG Y,XUE S,GUI X M,et al.Digital Simulation to the Development of Axial Blood Pump for Artificial Heart[J].Chinese Journal of Biomedical Engineering,2007,26(1):35-41.
[4]侯晓彤,蔺嫦燕,吴广辉,等.计算流体力学分析评价XZ-II型血泵的血液破坏[J].北京生物医学工程,2005,24(6):462-467.HOU X T,LIN C Y,WU G H,et al.Estimating Blood Damage of XZ-II Axial Flow Blood Pump by Computational Fluid Dynamics Analysis[J].Beijing Biomedical Engineering,2005,24(6):462-467.
[5]赵春章,张锡文,白净.可植入式微型轴流血泵和流场的数值模拟[J].机械工程学报,2005,41(7):19-23.ZHAO C Z,ZHANG X W,BAI J.Numerical Simulation of Flow Field in a Microaxial Blood Pump[J].Chinese Journal of Mechanical Engineering,2005,41(7):19-23.
[6]HSU C H.Flow Study on a Newly Developed Impeller for a Left Ventricular Assist Device[J].Artif Organs,2003(6):92-100.
[7]UNTAROIU A,WOOD H G,ALLAIRE P E,et al.Computational Design and Experimental Testing of a Novel Axial Flow LVAD[J].American Society for Artificial Internal Organs,2005,51(6):702-710.
[8]吴玉林,刘娟,陈铁军,等.叶片泵设计与实例[M].北京:机械工业出版社,2011.
[9]李涛.两级轴流血泵结构设计与性能仿真[D].武汉:武汉科技大学,2012.
[10]贾继孺.流线体外形曲线的一个数学表示方法[J].舰船科学技术,1986,05:52-59.
[11]STEPANOFF A J.Centrifugal and Axial Flow Pumps:Theory,Design and Application,Second Edition[M].Florida:Krieger Publishing Company,1992.
[12]邹高万,贺征,顾璇.粘性流体力学[M].北京:国防工业出版社,2013.
[13]UNTAROIU A,WOOD H G,ALLAIRE P E,et al.Computational Design and Experimental Testing of a Novel Axial Flow LVAD[J].American Society for Artificial Internal Organs,2005,51(6):702-710.
[14]NIIMI H.切变流动中红细胞膜上的交变载荷:溶血的潜在原因[J].生物医学工程国外分册,1986,9(4):291-296.
[15]云中,谭建平,杨剑平.植入式微型螺旋血泵叶轮设计[J].机械工程与自动化,2006,138(5):4-5YUN Z,TAN J P,YANG J P.Design of an Embedded Micro Spiral Blood Pump Impeller[J].Mechanical Engineering&Automation,2006,138(5):4-5.