外磁力振动对植入式轴流血泵流场的影响研究
发布时间：2019-01-10 10:39
【摘要】：溶血性能是血泵性能研究的重要方面,采用CFD技术对血泵流场进行仿真分析,利用得到的流场参数可以对血泵的溶血指数进行预估。但国内外学者对流场进行研究时,大多假设血泵处在固定静止的环境中,没有考虑到血泵的植入环境、高转速、受驱动力不均匀等因素引起的血泵振动问题。 本文以在弹性植入环境中外磁驱动的植入式轴流血泵为研究对象,对血泵的永磁体转子受不平衡的电磁场驱动力形成的振动进行了研究,并根据振动状态研究了振动对血泵流场的影响和对单个红细胞变形和受力的影响,结合这些影响分析了振动对血泵溶血的影响。 本文主要研究内容及结论有： 1.基于电磁学、机械系统动力学等学科知识,计算了血泵永磁体转子在工作时受驱动磁场的作用力,并用仿真验证了作用力计算的正确性；建立了血泵弹性植入环境的模型,结合血泵受到的驱动磁力,构建了血泵在弹性植入环境中受驱动磁力振动的动力学系统；利用simulink对系统进行了搭建和求解计算,研究了血泵在各转速下的振动特性。 2.利用FLUENT对血泵流场受振动影响进行了仿真分析,通过改变振动速度振幅和频率,观察相应的流场中速度矢量、红细胞容积率分布、壁面剪切应力云图,得到了振动速度振幅和频率与这些流场参数的关系,继而分析了振幅和频率对血泵溶血的影响。 3.对在振动边界流场中的单个红细胞进行了建模,并利用FLUENT进行了仿真计算,得到了红细胞在振动流场中的变形过程、受力状态和流场状态,根据这三个因素分析了振动流场对血泵中红细胞损伤的影响。 4.对血泵的弹性植入环境进行了实验模拟,搭建了测量血泵在弹性环境中受驱动磁力振动的实验系统；采集了在不同血泵转速、模型弹性系数情况下,血泵振动加速度分量数据；将数据进行分析与处理,与求解得到的理论值进行比较,验证了血泵振动理论研究的正确性。
[Abstract]:Hemolysis performance is an important aspect in the study of blood pump performance. CFD technique is used to simulate the flow field of the blood pump. The hemolytic index of the blood pump can be estimated by using the obtained flow field parameters. However, when the domestic and foreign scholars study the flow field, most of them assume that the blood pump is in a stationary environment, and do not take into account the problems of the blood pump vibration caused by the implanted environment, high speed, uneven driving force and so on. In this paper, the vibration of the permanent magnet rotor of the blood pump driven by an unbalanced electromagnetic field is studied, which is driven by the internal and external magnetic field in the elastic implantation environment. The effects of vibration on the flow field of blood pump and on the deformation and force of single red blood cell were studied according to the vibration state, and the effects of vibration on hemolysis of blood pump were analyzed. The main contents and conclusions of this paper are as follows: 1. Based on the knowledge of electromagnetism and mechanical system dynamics, the force of driving magnetic field on the permanent magnet rotor of blood pump is calculated, and the correctness of the calculation of the force is verified by simulation. The model of blood pump elastic implantation environment is established. Combined with the driving magnetic force of blood pump, the dynamic system of blood pump driven magnetic vibration in elastic implantation environment is constructed. The system was built and solved by simulink, and the vibration characteristics of blood pump at various speeds were studied. 2. The effect of vibration on the flow field of blood pump was simulated by FLUENT. By changing the amplitude and frequency of vibration velocity, the velocity vector, the distribution of erythrocyte volume rate and the wall shear stress cloud were observed. The relationship between the amplitude and frequency of vibration velocity and these parameters of flow field is obtained, and the effect of amplitude and frequency on hemolysis of blood pump is analyzed. 3. The single red blood cell in the vibration boundary flow field is modeled and simulated by FLUENT. The deformation process, the stress state and the flow field state of the red blood cell in the vibration flow field are obtained. According to these three factors, the effect of vibration flow field on erythrocyte damage in blood pump was analyzed. 4. In this paper, the elastic implant environment of blood pump is simulated, an experimental system is set up to measure the magnetic vibration of blood pump driven in elastic environment, and the acceleration component data of blood pump vibration are collected under the condition of different blood pump speed and model elastic coefficient. The analysis and processing of the data are compared with the theoretical values obtained by the solution, and the correctness of the theoretical research on the vibration of the blood pump is verified.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH38
本文编号：2406213
[Abstract]:Hemolysis performance is an important aspect in the study of blood pump performance. CFD technique is used to simulate the flow field of the blood pump. The hemolytic index of the blood pump can be estimated by using the obtained flow field parameters. However, when the domestic and foreign scholars study the flow field, most of them assume that the blood pump is in a stationary environment, and do not take into account the problems of the blood pump vibration caused by the implanted environment, high speed, uneven driving force and so on. In this paper, the vibration of the permanent magnet rotor of the blood pump driven by an unbalanced electromagnetic field is studied, which is driven by the internal and external magnetic field in the elastic implantation environment. The effects of vibration on the flow field of blood pump and on the deformation and force of single red blood cell were studied according to the vibration state, and the effects of vibration on hemolysis of blood pump were analyzed. The main contents and conclusions of this paper are as follows: 1. Based on the knowledge of electromagnetism and mechanical system dynamics, the force of driving magnetic field on the permanent magnet rotor of blood pump is calculated, and the correctness of the calculation of the force is verified by simulation. The model of blood pump elastic implantation environment is established. Combined with the driving magnetic force of blood pump, the dynamic system of blood pump driven magnetic vibration in elastic implantation environment is constructed. The system was built and solved by simulink, and the vibration characteristics of blood pump at various speeds were studied. 2. The effect of vibration on the flow field of blood pump was simulated by FLUENT. By changing the amplitude and frequency of vibration velocity, the velocity vector, the distribution of erythrocyte volume rate and the wall shear stress cloud were observed. The relationship between the amplitude and frequency of vibration velocity and these parameters of flow field is obtained, and the effect of amplitude and frequency on hemolysis of blood pump is analyzed. 3. The single red blood cell in the vibration boundary flow field is modeled and simulated by FLUENT. The deformation process, the stress state and the flow field state of the red blood cell in the vibration flow field are obtained. According to these three factors, the effect of vibration flow field on erythrocyte damage in blood pump was analyzed. 4. In this paper, the elastic implant environment of blood pump is simulated, an experimental system is set up to measure the magnetic vibration of blood pump driven in elastic environment, and the acceleration component data of blood pump vibration are collected under the condition of different blood pump speed and model elastic coefficient. The analysis and processing of the data are compared with the theoretical values obtained by the solution, and the correctness of the theoretical research on the vibration of the blood pump is verified.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH38
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