基于数值模拟的离心式血泵叶片参数优化与性能分析研究

摘要(中文译文)

以离心血泵为研究对象，研究叶片类型和叶片包角对泵性能的影响，旨在确定低比转速离心血泵的最佳叶片构型以及相关系数φ=zψ/360°的适宜范围。采用速度系数法设计离心血泵叶轮。通过计算流体动力学（CFD）模拟评估泵性能。采用欧拉溶血估计模型，比较不同包角的圆柱形叶片和扭曲叶片对关键性能指标（包括溶血指数）的影响。所设计的离心血泵满足成人正常生理需求，并表现出良好的血液相容性。在设计流量下，扭曲叶片比圆柱形叶片提供更高的扬程和水力效率，但代价是血液损伤增加。对于比转速为70的六叶片离心血泵，兼顾水力性能和溶血的最佳包角范围为90°-110°，对应的相关系数f为1.5至1.8。圆柱形叶片叶轮在设计流量下表现出更好的溶血性能。所确定的相关系数f的最佳范围将已有的工业泵关联式扩展到离心血泵领域，为未来血泵开发提供了有价值的设计参考。

Abstract

Taking the centrifugal blood pump as the research object, this study investigates the effects of blade type and blade wrap angle on pump performance, aiming to determine the optimal blade configuration and the appropriate range of the correlation coefficient φ = zψ/360° for low-specific-speed centrifugal blood pumps. The impeller of the centrifugal blood pump was designed using the velocity coefficient method. Computational fluid dynamics (CFD) simulations were performed to evaluate pump performance. The Eulerian hemolysis estimation model was employed to compare the effects of cylindrical blades with different wrap angles and twisted blades on key performance indicators, including the hemolysis index. The designed centrifugal blood pump meets the normal physiological requirements of adults and exhibits good blood compatibility. At the design flow rate, twisted blades provide higher pressure head and hydraulic efficiency than cylindrical blades, but at the cost of increased blood damage. For a six-blade centrifugal blood pump with a specific speed of 70, the optimal wrap angle range that balances hydraulic performance and hemolysis is 90°-110°, corresponding to a correlation coefficient f ranging from 1.5 to 1.8. The cylindrical blade impeller demonstrates better hemolysis performance at the design flow rate. The identified optimal range of the correlation coefficient f extends an established industrial pump correlation to the field of centrifugal blood pumps, providing a valuable design reference for future blood pump development.

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