一种轴流血泵的磁液双悬浮支承系统

目的:为解决第三代血泵中磁力和液力悬浮系统体积偏大、发热多、水力性能差、血损严重等问题,提出一种磁液双悬浮支承系统。方法:磁液双悬浮支承系统轴向靠磁力、径向靠径向液力共同实现转子的稳定悬浮;分别利用ANSYS电磁模块和楔形动压承载原理对轴向磁力、径向液力进行分析,利用Fluent对磁液双悬轴流血泵的水力性能进行仿真分析。结果:对悬浮系统轴向、径向承载力的分析以及悬浮实验结果表明该系统可以实现稳定的悬浮;Fluent仿真及水力实验表明当血泵转子转速为9 500 r/min以上时,能满足人体需要。结论:磁液双悬浮支承系统具有较好的悬浮性、水力性能,可作为第三代血泵进一步改进的选择方向。

Mathematical analysis of Phan-Thien-Tanner fluid model for blood in arteries

In the present paper, we have studied the blood flow through tapered artery with a stenosis. The non-Newtonian nature of blood in small arteries is analyzed mathematically by considering the blood as Phan-Thien-Tanner fluid. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different type of tapered arteries （i.e. converging tapering, diverging tapering, non-tapered artery） have been examined for different narameters of interest.