红细胞撞击损伤机理研究及仿真分析

Study and Simulation Analysis on the Hurt Principle of the RBC Impact

采用薄壁球壳理论及液滴激波理论,研究了旋转叶轮血泵中红细胞-叶片撞击损伤机理,给出了红细胞撞击压力表达式及红细胞膜极限应力数值,并采用ALE有限元法对撞击过程进行仿真,分析不同撞击速度下红细胞形状及应力变化,得到了临界撞击速度数值,并进行了实验验证。

The hurt principle of the impact between RBC and impeller in the rotated impelled blood pump is studied by using the theory of thinner sphere shell and the theory of liquid drop. The impact stress equation and the extreme stress value of the impacted RBC are presented. The process simulation of the impact is carried out by using ALE finite element method. The RBC variation of the shape and stress at different impact speed are analyzed. The critical impact speed is obtained, and the result is proved by experiment,