Ucak Kagan, Karatas Faruk, Cetinkaya Emre, Pekkan Kerem
Mechanical Engineering Department, Koç University, Rumeli Feneri Kampüsü, Sarıyer, Istanbul, 34450, Turkey.
Mechanical Engineering, Yildiz Technical University, Istanbul, Turkey.
Sci Rep. 2024 Aug 28;14(1):19962. doi: 10.1038/s41598-024-70243-7.
A blood turbine-pump system (iATVA), resembling a turbocharger was proposed as a mechanical right-heart assist device without external drive power. In this study, the iATVA system is investigated with particular emphasis on the blood turbine flow dynamics. A time-resolved 2D particle image velocimetry (PIV) set-up equipped with a beam splitter and two high speed cameras, allowed simultaneous recordings from both the turbine and pump impellers at 7 different phased-locked instances. The iATVA prototype is 3D printed using an optically clear resin following our earlier PIV protocols. Results showed that magnetically coupled impellers operated synchronously. As the turbine flow rate increased from 1.6 to 2.4 LPM, the rotational speed and relative inlet flow angle increase from 630 to 900 rpm, and 38 to 55% respectively. At the trailing edges, backflow region spanned 3/5 of the total passage outlet flow, and an extra leakage flow was observed at the leading edge. For this early turbine design, approximately, 75% of the turbine blade passage was not contributing to the impulse operation mode. The maximum non-wall shear rate was ~ 2288 s near to the inlet exit, which is significantly lower than the commercial blood pumps, encouraging further research and blood experiments of this novel concept. Experimental results will improve the hydrodynamic design of the turbine impeller and volute regions and will be useful in computational fluid dynamics validation studies of similar passive devices.
一种类似涡轮增压器的血液涡轮泵系统（iATVA）被提议作为一种无需外部驱动动力的机械右心辅助装置。在本研究中，对iATVA系统进行了研究，特别强调了血液涡轮的流动动力学。一个配备分束器和两台高速摄像机的时间分辨二维粒子图像测速（PIV）装置，允许在7个不同的锁相时刻同时记录涡轮和泵叶轮的情况。按照我们早期的PIV协议，使用光学透明树脂对iATVA原型进行3D打印。结果表明，磁耦合叶轮同步运行。随着涡轮流量从1.6升/分钟增加到2.4升/分钟，转速和相对进口流动角分别从630转/分钟增加到900转/分钟，以及从38%增加到55%。在尾缘处，回流区域跨越了总通道出口流的3/5，并且在前缘处观察到额外的泄漏流。对于这种早期的涡轮设计，大约75%的涡轮叶片通道没有参与到冲击运行模式中。靠近进口出口处的最大非壁面剪切率约为2288秒⁻¹，这明显低于商用血液泵，这鼓励对这一新颖概念进行进一步研究和血液实验。实验结果将改善涡轮叶轮和蜗壳区域的流体动力学设计，并将有助于类似无源装置的计算流体动力学验证研究。
