随着冠状动脉疾病治疗的改善,更多的患者存活到心力衰竭发生。这导致需要用于与心力衰竭作斗争的装置的患者增加。已知心室辅助装置是这些装置的支柱。本研究旨在设计一种离心泵作为心室辅助装置。为了设计泵,首先,泵的几何参数,包括间隙距离,叶片高度,和出口相对于叶片的位置,被调查了。最后,选定的配置,具有所有适当的特征,水力和生理上,用于其余的研究。刀片的研究,作为能量转移到血液的主要成分,在离心泵中,在本研究中已经考虑到了。在这方面,点对点设计方法,用于工业应用,已实施。设计者在点对点方法中选择每个半径处的叶片角度之间的关系。本研究选择了对数和二阶关系来设计叶片的轮廓。总的来说,在这项研究中检查了58个叶片,这在叶片入口和出口角度以及角度与径向位置之间的关系方面有所不同。利用ANSYSCFX17.0软件模拟叶片性能,并使用美国食品和药物管理局(FDA)提供的基准泵对数值模拟进行验证。然后,从数值调查中选出的叶轮被制造出来,并将其性能与FDA基准泵进行了实验比较。还开发了用于实验研究的液压试验台。结果表明,在本研究设计的叶片中,输入角为45°,输出角为55°的叶片,旨在实现对数关系,具有最佳性能。与FDA泵相比,选定的叶轮配置可以在不同的流速下增加总扬程(至少增加20%)。
With improved treatment of coronary artery disease, more patients are surviving until heart failure occurs. This leads to an increase in patients needing devices for struggling with heart failure. Ventricular assist devices are known as the mainstay of these devices. This study aimed to design a centrifugal pump as a ventricular assist device. In order to design the pump, firstly, the geometrical parameters of the pump, including the gap distance, blade height, and position of the outlet relative to the blade, were investigated. Finally, the selected configuration, which had all the appropriate characteristics, both hydraulically and physiologically, was used for the rest of the study. The study of the blade, as the main component in energy transfer to the blood, in a centrifugal pump, has been considered in the present study. In this regard, the point-to-point design method, which is used in industrial applications, was implemented. The designer chooses the relationship between the blade angles at each radius in the point-to-point method. The present study selected logarithmic and second-order relations for designing the blade\'s profile. In total, 58 blades were examined in this study, which differed regarding blade inlet and outlet angles and the relationship between angle and radial position. ANSYS CFX 17.0 software was utilized to simulate blades\' performances, and a benchmark pump provided by the US Food and Drug Administration (FDA) was used to validate the numerical simulations. Then, the selected impeller from the numerical investigation was manufactured, and its performance was compared experimentally with the FDA benchmark pump. A hydraulic test rig was also developed for experimental studies. The results showed that among the blades designed in this study, the blade with an input angle of 45° and an output angle of 55°, which is designed to implement a logarithmic relationship, has the best performance. The selected impeller configuration can increase the total head (at least by 20%) at different flow rates compared to the FDA pump.