双出口离心式圆盘血泵流动特性研究  

Research on flow characteristics of dual-outlet centrifugal disk blood pumps

作　　者：连起龙 肖媛[1] 肖义平 曹展硕 崔国民[1] LIAN Qilong;XIAO Yuan;XIAO Yiping;CAO Zhanshuo;CUI Guomin(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,P.R.China)

机构地区：[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

出　　处：《生物医学工程学杂志》2025年第2期374-381,共8页Journal of Biomedical Engineering

基　　金：国家自然科学基金项目(21978171,51976126);中国博士后科学基金资助项目(2020M671171)。

摘　　要：特斯拉血泵相较于叶片式血泵,展现出能减少溶血与血栓形成的潜力。鉴于叶片式血泵的二次流道驱动力有限,以及普通特斯拉血泵液压效率不高,且其内部流动特性对溶血及血栓形成有较大影响,本研究在特斯拉血泵转子基础上增设了一组叶片,构成双流体域转子,并采用轴向双出口蜗壳结构实现流体域分隔。通过对新结构进行数值模拟,本研究对比分析了相同转子下,双出口与单出口蜗壳、对称与非对称断面的内部流动特性。研究结果显示:双出口蜗壳结构下,流场分布更为均匀,整体能量耗散降低;采用双出口后,非对称断面相较于对称断面,在隔舌处的流体速度梯度、湍动能减小,扩压管出口汇聚处的流体速度梯度减小;最大标量应力更低,扬程、效率下降幅度减小;与单出口蜗壳相比,双出口蜗壳的非对称断面溶血指数有所降低。综上所述,本文提出一种新型双出口离心式圆盘血泵,可为磁悬浮离心式血泵的结构设计及性能优化提供参考。Tesla blood pumps demonstrate a reduced propensity for hemolysis and thrombosis compared with vane blood pumps. Considering the restricted driving force within the secondary flow channel of vane blood pumps, along with the low hydraulic efficiency of conventional Tesla blood pumps and their internal flow characteristics that significantly contribute to hemolysis and thrombosis, this study introduces a set of vanes atop the rotor of the Tesla blood pump. This forms a dual-fluid domain rotor, and an axial dual-outlet volute shell structure is adopted to realize the separation of the fluid domains. Through numerical simulations of the new structure, a comparative analysis was conducted in this study on the internal flow characteristics of double-outlet and single-outlet volute shells, and symmetric and asymmetric cross-sections of the same rotor. The results indicate that the flow field distribution is more uniform under the double-outlet volute shell structure, and overall energy dissipation is decreased. After implementing the doubleoutlet design, in the asymmetric cross-section, compared with the symmetric cross-section, the fluid velocity gradient and turbulent kinetic energy at the tongue of the septum are reduced, and the fluid velocity gradient at the convergence of the diffuser tube outlets are also decreased. The maximum scalar stress is lower, and the decline in head and efficiency is mitigated. Moreover, compared with the single-outlet volute shell, the hemolysis index in the asymmetric cross-section is reduced. In summary, this paper proposes a novel dual-outlet centrifugal disk blood pumps, which can provide a reference for the structural design and performance optimization of magnetically levitated centrifugal blood pumps.

关 键 词：特斯拉血泵 溶血 血栓 双出口蜗壳 

分 类 号：TH311[机械工程—机械制造及自动化]