DHI-NTU Water & Environment Centre and Education Hub, Nanyang Technological University, Singapore.
Artif Organs. 2012 Apr;36(4):359-67. doi: 10.1111/j.1525-1594.2011.01362.x. Epub 2011 Nov 1.
A magnetically suspended axial flow blood pump is studied experimentally in this article. The pump casing enclosed a three-blade straightener, a two-blade impeller shrouded by a permanent magnet-embedded cylinder, and a three-blade diffuser. The internal flow fields were simulated earlier using computational fluid dynamics (CFD), and the pump characteristic curves were determined. The simulation results showed that the internal flow field was basically streamlined, except the diffuser region. Particle image velocimetry (PIV) measurement of the 1:1 pump model was conducted to validate the CFD result. In order to ensure the optical access, an acrylic prototype was fabricated with the impeller driven by a servomotor instead, as the magnet is opaque. In addition to the transparent model, the blood analog fluid with the refractive index close to that of acrylic was used to avoid refraction. According to the CFD results, the axial flow blood pump could generate adequate pressure head at the rotating speed of 9500rpm and flow rate of 5L/min, and the same flow condition was applied during the PIV measurement. Through the comparisons, it was found that the experimental results were close to those obtained by CFD and had thus validated the CFD model, which could complement the limitation of the measurement in assessing the more detailed flow fields of the axial flow pump.
本文对一种磁悬浮轴流血泵进行了实验研究。泵壳内包含一个三叶片整流器、一个被永磁体嵌入圆柱包裹的两叶片叶轮，以及一个三叶片扩压器。先前使用计算流体动力学（CFD）对内部流场进行了模拟，并确定了泵的特性曲线。模拟结果表明，除了扩压器区域外，内部流场基本上是流线型的。为了验证 CFD 结果，对 1:1 泵模型进行了粒子图像测速（PIV）测量。为了确保光学通道，使用了一个由伺服电机驱动的叶轮的丙烯酸原型来代替，因为磁铁是不透明的。除了透明模型之外，还使用了折射率接近丙烯酸的血液模拟液体来避免折射。根据 CFD 结果，轴流血泵在 9500rpm 的转速和 5L/min 的流量下可以产生足够的压力头，并且在 PIV 测量中应用了相同的流量条件。通过比较，发现实验结果与 CFD 获得的结果非常接近，从而验证了 CFD 模型，该模型可以补充测量在评估轴流泵更详细流场方面的局限性。
