發(fā)布時間：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技術(shù)對血泵流場進行仿真分析,利用得到的流場參數(shù)可以對血泵的溶血指數(shù)進行預(yù)估。但國內(nèi)外學(xué)者對流場進行研究時,大多假設(shè)血泵處在固定靜止的環(huán)境中,沒有考慮到血泵的植入環(huán)境、高轉(zhuǎn)速、受驅(qū)動力不均勻等因素引起的血泵振動問題。 本文以在彈性植入環(huán)境中外磁驅(qū)動的植入式軸流血泵為研究對象,對血泵的永磁體轉(zhuǎn)子受不平衡的電磁場驅(qū)動力形成的振動進行了研究,并根據(jù)振動狀態(tài)研究了振動對血泵流場的影響和對單個紅細胞變形和受力的影響,結(jié)合這些影響分析了振動對血泵溶血的影響。 本文主要研究內(nèi)容及結(jié)論有： 1.基于電磁學(xué)、機械系統(tǒng)動力學(xué)等學(xué)科知識,計算了血泵永磁體轉(zhuǎn)子在工作時受驅(qū)動磁場的作用力,并用仿真驗證了作用力計算的正確性；建立了血泵彈性植入環(huán)境的模型,結(jié)合血泵受到的驅(qū)動磁力,構(gòu)建了血泵在彈性植入環(huán)境中受驅(qū)動磁力振動的動力學(xué)系統(tǒng)；利用simulink對系統(tǒng)進行了搭建和求解計算,研究了血泵在各轉(zhuǎn)速下的振動特性。 2.利用FLUENT對血泵流場受振動影響進行了仿真分析,通過改變振動速度振幅和頻率,觀察相應(yīng)的流場中速度矢量、紅細胞容積率分布、壁面剪切應(yīng)力云圖,得到了振動速度振幅和頻率與這些流場參數(shù)的關(guān)系,繼而分析了振幅和頻率對血泵溶血的影響。 3.對在振動邊界流場中的單個紅細胞進行了建模,并利用FLUENT進行了仿真計算,得到了紅細胞在振動流場中的變形過程、受力狀態(tài)和流場狀態(tài),根據(jù)這三個因素分析了振動流場對血泵中紅細胞損傷的影響。 4.對血泵的彈性植入環(huán)境進行了實驗?zāi)M,搭建了測量血泵在彈性環(huán)境中受驅(qū)動磁力振動的實驗系統(tǒng)；采集了在不同血泵轉(zhuǎn)速、模型彈性系數(shù)情況下,血泵振動加速度分量數(shù)據(jù)；將數(shù)據(jù)進行分析與處理,與求解得到的理論值進行比較,驗證了血泵振動理論研究的正確性。
[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.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH38

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