轴流血泵不同转速下内流及能量特性研究  

Study on Internal Flow and Energy Characteristics of Axial Flow Pump at Different Rotational Speeds

作　　者：喻哲钦 王杰 刘瑞[1] 刘忠[1] 谭建平[2] 曾栋坪 YU Zheqin;WANG Jie;LIU Rui;LIU Zhong;TAN Jianping;ZENG Dongping(College of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410114 [2]中南大学机电工程学院,长沙410083

出　　处：《工程热物理学报》2024年第12期3698-3705,共8页Journal of Engineering Thermophysics

基　　金：湖南省自然科学基金(No.2022JJ40504,No.2023JJ40030);国家自然科学基金(No.52175263)。

摘　　要：血泵长期恒定流量输送对植入者存在健康风险,变转速运行是实现脉动流量输送的有效方式,但过高转速或偏离设计转速会导致内流紊乱与能量效率下降。对此,研究建立血泵及喷管模型,采用数值模拟与可视化实验方法,结合熵产理论探究血泵在不同转速下的内部流动与能量损失特性。结果显示:流场能量损失及剪切应力随流动剧烈程度显著提升,流场中湍流熵产远高于直接熵产,速度变化梯度对熵产损失与剪切应力存在关键影响;血泵的能量损失随转速增加而提升,叶轮区域的熵产占总能量损失的80%以上,高转速下后导叶湍流熵产显著增加;叶轮叶片进口与后导叶叶片出口具有最高的局部熵产率,液流进出角与叶片方向的差角及血泵高转速是影响能量损失的核心因素。Long-term constant flow delivery of blood pumps is a health risk for implanted patients,and variable speed operation is an effective way to realize pulsatile flow delivery,but too high speed or deviation from the design speed will lead to internal fow turbulence and a decrease in energy efficiency.In this regard,the study establishes blood pump and nozzle models,adopts numerical simulation and visualization experimental methods,and combines entropy production theory to investigate the internal flow and energy loss characteristics of the blood pump at different rotational speeds.The results show that:the fow feld energy loss and shear stress increase significantly with the fow intensity,the turbulent entropy production in the flow field is much higher than the direct entropy production,and the velocity gradient has a key effect on the entropy loss and shear stress;the energy loss of the blood pump increases with the increase of rotational speed,the entropy production in the impeller area accounts for more than 80%of the total energy loss,and the turbulence entropy production of the back-vane increases significantly under the high rotational speed;the inlet and outlet of the impeller blade and the back-vane blade have the highest local entropy production,the difference angle between the liquid fow angle and the blade direction as well as the high rotational speed are the central factors affecting the energy loss.

关 键 词：血泵 变转速运行 内流特性 能量特性 

分 类 号：TH31[机械工程—机械制造及自动化]