脉动流对液流悬浮式血泵悬浮力的影响。
The Impact of Pulsatile Flow on Suspension Force for Hydrodynamically Levitated Blood Pump.
机构信息
School of Mechanical & Energy Engineering, Zhejiang University of Science & Technology, Hangzhou, China.
State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Hangzhou, China.
出版信息
J Healthc Eng. 2019 Jun 3;2019:8065920. doi: 10.1155/2019/8065920. eCollection 2019.
Hydrodynamically levitated rotary blood pumps (RBPs) with noncontact bearing are effective to enhance the blood compatibility. The spiral groove bearing (SGB) is one of the key components which offer the suspension force to the RBP. Current studies focus on the suspension performance of the SGB under continuous flow condition. However, the RBP shows pulsatile characteristics in the actual clinical application, which may affect the suspension performance of the SGB. In this paper, the impact of pulsatile flow upon the suspension force from the SGB is studied. A model of the SGB with a groove formed of wedge-shaped spirals is built. Then, the CFD calculation of the hydrodynamic force offered by designed SGB under simulated pulsatile flow is introduced to obtain the pulsatile performance of the suspension force. The proposed method was validated by experiments measuring the hydrodynamic force with different bearing gaps. The results show that the suspension force of the SGB under pulsate flow is the same as under steady flow with equivalent effective pressure. This paper provides a method for suspension performance test of the SGB.
液力悬浮式旋转血泵（RBPs）采用无接触式轴承，可有效提高血液相容性。螺旋槽轴承（SGB）是为 RBP 提供悬浮力的关键部件之一。目前的研究主要集中在连续流动条件下 SGB 的悬浮性能上。然而，在实际的临床应用中，RBP 表现出脉动特性，这可能会影响 SGB 的悬浮性能。本文研究了脉动流对 SGB 悬浮力的影响。建立了一个楔形螺旋槽形成的 SGB 模型。然后，介绍了在模拟脉动流下设计的 SGB 提供的流体动力的 CFD 计算，以获得悬浮力的脉动性能。通过不同轴承间隙下测量的流体动力实验对提出的方法进行了验证。结果表明，SGB 在脉动流下的悬浮力与等效有效压力下的稳流相同。本文为 SGB 的悬浮性能测试提供了一种方法。
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