A computational and experimental comparison of two outlet stators for the Nimbus LVAD. Left ventricular assist device.
A computational and experimental comparison of two outlet stators for the Nimbus LVAD. Left ventricular assist device.
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Nimbus LVAD 的两个出口定子的计算和实验比较。
DOI：
10.1097/00002480-199907000-00014
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Butler,KC
中科院分区：
文献类型：
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作者：
Burgreen,GW;Antaki,JF;Wu,J;leBlanc,P;Butler,KC
本文分析了Nimbus轴流式左心室辅助装置（LVAD）在额定工作条件下的两种出口稳定器设计。原始定子组件（设计1）具有显著的流动分离和反向。第二定子组件（设计2）用收敛-发散喉部部分代替原始管状外壳，目的是局部改善流体动力学。这两种定子设计进行了分析，使用计算流体动力学（CFD）分析和实验粒子成像流动可视化（PIFV）。计算和实验方法表明：1）设计1中的流动分离持续区域和设计2中的改进流体动力学; 2）两种设计的叶片间速度场在叶尖处组织良好，但在叶毂处混乱; 3）与设计1相比，设计2的压力恢复适度降低。计算流体力学分析提供了必要的洞察力，以确定设计2的水力效率降低的原因是一个微妙的局部流动加速。此外，设计1的致血栓性出奇地低，这是由于存在三维非稳态涡流结构，可增强边界平流。ASAIO Journal 1999; 45：328-333.
Two designs of an outlet stalor for the Nimbus axial flow left ventricular assist device (LVAD) are analyzed at nominal operating conditions. The original stator assembly (Design 1) has significant flow separation and reversal. A second stator assembly (Design 2) replaces the original tubular outer housing with a converging-diverging throat section with the intention of locally improving the fluid dynamics. Both stator designs are analyzed using computational fluid dynamics (CFD) analysis and experimental particle imaging flow visualization (PIFV). The computational and experimental methods indicate: 1) persistent regions of flow separation in Design 1 and improved fluid dynamics in Design 2; 2) blade-to-blade velocity fields that are well organized at the blade tip yet chaotic at the blade hub for both designs; and 3) a moderate decrease in pressure recovery for Design 2 as compared with Design 1. The CFD analysis provides the necessary insight to identify a subtle, localized flow acceleration responsible for the decreased hydraulic efficiency of Design 2. In addition, the curiously low thrombogenicity of Design 1 is explained by the existence of a three-dimensional unsteady vortical flow structure that enhances boundary advection. ASAIO Journal 1999; 45: 328–333.