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Numerical simulation of an axial blood pump.

机译：轴向血泵的数值模拟。

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The axial blood pump with a magnetically suspended impeller is superior to other artificial blood pumps because of its small size. In this article, the distributions of velocity, path line, pressure, and shear stress in the straightener, the rotor, and the diffuser of the axial blood pump, as well as the gap zone were obtained using the commercial software, Fluent (version 6.2). The main focus was on the flow field of the blood pump. The numerical results showed that the axial blood pump could produce 5.14 L/min of blood at 100 mm Hg through the outlet when rotating at 11 000 rpm. However, there was a leakage flow of 1.06 L/min in the gap between the rotor cylinder and the pump housing, and thus the overall flow rate the impeller could generate was 6.2 L/min. The numerical results showed that 75% of the scalar shear stresses (SSs) were less than 250 Pa, and 10% were higher than 500 Pa within the whole pump. The high SS region appeared around the blade tip where a large variation of velocity direction and magnitude was found, which might be due to the steep angle variation at the blade tip. Because the exposure time of the blood cell at the high SS region within the pump was relatively short, it might not cause serious damage to the blood cells, but the improvement of blade profile should be considered in the future design of the axial pump.
机译：带有磁悬浮叶轮的轴向血液泵由于体积小而优于其他人工血液泵。在本文中，使用商业软件Fluent（6.2版）获得了轴向血泵的矫直器，转子和扩散器中的速度，路径，压力和剪切应力的分布以及间隙区域。 ）。主要重点是血液泵的流场。数值结果表明，当以11000 rpm的转速旋转时，轴向血泵可以通过出口以100 mm Hg的速度产生5.14 L / min的血液。但是，在转子气缸和泵壳之间的间隙中存在1.06 L / min的泄漏流量，因此叶轮可能产生的总流量为6.2 L / min。数值结果表明，在整个泵中，75％的标量剪应力（SSs）小于250 Pa，10％高于500 Pa。高SS区域出现在叶片尖端周围，在该区域发现速度方向和幅度有较大变化，这可能是由于叶片尖端的陡峭角度变化所致。由于在泵内高SS区域血细胞的暴露时间相对较短，因此可能不会对血细胞造成严重损害，但在以后的轴向泵设计中应考虑改善叶片轮廓。

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