后置导轮对人工轴流心脏泵的影响分析

Influence of Diffuser for Artificial Axial Heart Pump

后置导轮在人工轴流心脏泵工作过程中具有至关重要的作用,为了研究其对心脏泵的影响,利用计算流体力学(CFD)的方法,详细分析了后置导轮对人工轴流心脏泵工作情况的影响。通过对轴流心脏泵内整个流场的数值模拟,讨论了引入后置导轮后,轴流心脏泵的压强增量、效率、工作情况以及流体受力等重要参数的变化。计算结果表明:引入合适的后置导轮能够改善流场分布,限制出流的速度方向,提供足够的静压增量,有利于传输血液,同时基本保持了泵的效率不降低。因此,在人工轴流心脏泵设计过程中引入后置导轮是必要的,但需要对后置导轮的参数进行严格的分析。

Inducer and diffuser play important roles when blood is transported by an artificial axial heart pump. In this article, computational fluid dynamics （CFD） simulations were applied to analysis the influence of diffuser for the axial artificial heart pump. The current work was focused on the change of static pressure rise, efficiency, working situation and fluid shear stress for pump. Analysis results indicated that proper diffuser model could improve the fluid distribution along the pump, project the direction of outlet velocity parallel to axis, keep good pump efficiency and supply enough static pressure, which are necessary for blood transportation. In conclusion, it is very important to add a diffuser to the impeller, while strict selection for parameters of diffuser must be carried out during the whole design procedure of axial artificial heart pump.