The influence of the assisted blood circulation pumps geometry on their head-flow Characteristics

Purpose of research. The object of the article is to determine the influence of the assisted blood circulation pumps geometry on the head-flow characteristic slope. Reasoning for the research consists of necessity in new blood circu lation assist pumps and demand for improving existing devices.

Methods. To assess the effect of geometric parameters on the slope of the head-flow characteristics, a three-factor numerical experiment plan has been developed, consisting of 21 pumps with different geometric parameters. The factors were: the diameter of the sleeve d, the diameter of the periphery D, and the diagonal angle of the sleeve φ of the pump impeller. Numerical simulation of blood flow in pumps was performed using the finite volume method in the OpenFOAM11 calculation package. The SIMPLE method was used for the calculation, and the MRF technology was used to account for rotation.

Results. As a result of the numerical experiment, relative head-flow characteristics for each pump were obtained, showing the influence of diameters D, d, and diagonality φ on the slope of the head-flow characteristic; these were approximated by a 3rd-degree polynomial using the least squares method. The obtained dependencies allow for de termining the pump rotation speed for any of its operating regimes. From the generalization of the results of numeri cal modeling of blood flow in the pumps, 3D-surfaces were obtained, representing a set of dependencies of the head flow characteristic slope on the geometric parameters of the pump flow path.

Conclusion.. It was established that the required increase in head-flow characteristic slope can be achieved by changing the hub and shroud diameters and the angle of diagonality. The minimum slope is achieved at the average values of the numerical experiment factors. The maximum slope corresponds with minimum and maximum diameter values. The research results have a practical value for designing and improving axial pumps of the assisted blood circulation devices

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