轴流式血泵黏弹性流体水动力特性数值模拟  

Numerical Simulation on Viscoelastic Fluid Hydrodynamics in an Axial Blood Pump

作　　者：胡其会[1] 张鸣远[1] 杨万英[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2010年第11期28-32,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50576074)

摘　　要：将一种黏弹性流体k-ε模型应用于自行设计的轴流式血泵内流动特性的数值模拟,分析了轴流泵的水动力特性,得到了泵壳与转子间狭缝中以及叶轮流道内的紊动能和紊动能耗散率的分布规律.研究发现:在相同流量和转速条件下,质量分数为0.06%的黄原胶水溶液的扬程高于以水为工质时的相应扬程,二者最大约相差35%,且计算结果与实测数据符合良好;轴流泵内黄原胶水溶液的紊动能和紊动能耗散率均显著低于水的相应值,粗略估算每千克黄原胶水溶液的机械能损失只是水的相应值的37%,表示以黏弹性流体为工质时,泵内部的黏性耗损降低,这正是黏弹性流体扬程高于水的扬程的物理原因.A κ-ε model for viscoelastic fluids was used to predict the turbulent flow characteristics in an axial bloo^t pump designed and tested in Xi＇an Jiaotong University. The pump hydrodynamics of the axial blood pump was analyzed, and the turbulent kinetic energy and the dissipation rate profile in the clearance gap between the rotor and the pump shell and in the main flow passage were achieved. It is found that the head rise of the aqueous solution of Xanthan gum with 0.06% in concentration is higher than that of water at the same flow rate and same rotating speekl, with a maximum difference of 35%, and the calculation results agree well with the measured data. The turbulent kinetic energy and the dissipation rate of the Xanthan gum solution are significantly lower than those of water in most part of the flow field. The mechanical energy loss per kilogram for the aqueous solution of Xanthan gum with 0. 06% in concentration is only 37% of that for water roughly. It is likely that lower dissipation rate may lead to a higher head rise of the viscoelastic fluid.

关 键 词：黏弹性流体k-ε模型 轴流式血液泵 数值模拟 

分 类 号：TH312[机械工程—机械制造及自动化]