【摘要】 应用计算流体动力学(computational fluid dynamics,CFD)方法对体外模拟循环系统(mock circulatory system,MCS)中使用的活塞阀、鸭嘴阀和蝶阀三种单向阀内部流场进行仿真分析,并重点分析蝶阀导流板的结构(包括:外圆弧形、三角形和内圆弧形)对血液流经单向阀的压力损失,流线与湍流动能分布,表面切应力及其对溶血的影响。结果显示,外圆弧形导流板对血液流经蝶阀的压力损失的数值,流线与湍流动能的分布均优于其它两种导流板结构,并且切应力的数值小于血细胞破碎极限值,阀内流场效果较好。本研究的结果表明外圆弧形导流板的蝶阀作为MCS中的单向阀具有结构简单和较好的抗溶血性能等优点,相关的仿真分析对于MCS的研究以及心室辅助装置(ventricular assist device,VAD)的设计都具有重要的参考价值。更多还原

【Abstract】 Adopting the computational fluid dynamics(CFD) method to simulate the internal flow field of piston valve, duckbill valve and butterfly valve that used in the mock circulatory system(MCS). We especially analyzed the effects of structure of the butterfly valve deflector(including: outer circular arc, triangle and inner circular arc) on pressure loss, streamline and turbulent flow energy distribution, surface shear stress of the blood flow through the check valve and its effect of which on hemolysis.The results showed that the outer circular deflector was better than the other two baffle structures on the pressure loss,the distribution of streamline and turbulent flow energy when the blood flowed through the butterfly valve, and the value of shear stress was less than the blood cell breakage limit, the flow field inside the valve was better.The results indicate that the butterfly valve of the outer circular deflector has simple structure and good hemolysis resistance as a check valve in the MCS, and the relevant simulation analysis has important reference value for the research of MCS and the design of ventricular assist device(VAD).更多还原