Optimization And Experimental Study Of Flow Channel Of Conical Axial Blood Pump

Nowadays,the number of people who die from exhaustion of heart failure in the society can reach one million every year.The emergence of artificial blood pumps provides a new idea for the treatment of patients with heart failure.Compared with centrifugal blood pumps,axial blood pumps have a compact structure,Small size and good hemolytic properties,so it has very good development prospects.In order to solve the problems of blood stagnation caused by the separation of the front and rear guide wheel hubs and the impeller hub of the traditional axial blood pump,and the hemolysis and high power consumption caused by the high speed of the axial blood pump,the structure was improved to optimize the blood pump flow path.This paper designs a conical axial-flow blood pump with an integrated rotor and conical impeller hub,which can effectively reduce the speed of the blood pump and reduce the volume of the blood pump,thereby reducing power consumption,improving hemolysis performance,and facilitating implantation.The application of blood pumps in clinical medicine is of great significance.The research object of this paper is the improved conical axial flow blood pump.The CFD numerical simulation technology is used to study the matching between different structural parameters of the blood pump flow path and the impeller,and to the important structural parameters of the conical axial flow blood pump.Optimize and predict hemolysis of the optimized blood pump;design and build an extracorporeal circulation experimental platform for the conical axial flow blood pump,and verify the reliability of CFD simulation analysis and the hydraulic power of the conical axial flow blood pump through the extracorporeal circulation experiment Whether the characteristics can meet physiological requirements.The main results obtained in this article are as follows:Adopt the design principle of traditional axial flow impeller,arc method and lift method to design the impeller structure to meet the physiological needs of human body,and propose the optimal design method of blood pump structure for the traditional axial flow.The RNG k-ε turbulence model is selected for numerical simulation analysis of the blood pump,and the structural improvement effect is analyzed: the optimized design of the front and rear tips of the hub can reduce the vortex and backflow phenomenon;the integrated rotor design can eliminate blood retention The area makes the streamline smooth and free of flow;the conical design of the impeller hub can greatly improve the blood pumping capacity of the blood pump.Use CFD simulation technology to study the influence of key parameters of the blood pump on the performance of the blood pump,and obtain a better flow channel structure of the blood pump.The optimized blood channel of the blood pump reduces the rotational speed of the traditional axial blood pump by 9.1% while meeting the physiological needs of the human body;it can be seen from the analysis of the internal flow field characteristics of the blood pump that the optimized total pressure distribution inside the blood pump is reasonable and the pressure gradient is uniform There is no obvious mutation;according to the prediction of hemolysis,the average value of the optimized blood pump hemolysis prediction is smaller than that of the traditional axial blood pump,indicating its excellent hemolytic performance.Build a conical axial blood pump extracorporeal circulation experimental platform,and perform an experimental analysis on the conical axial blood pump under different parameters.The overall experimental results are smaller than the simulation results,so there are errors,but the overall trend of the two is the same,And can meet the physiological needs of the human body on the premise of increasing the speed.The results prove the reliability of the simulation analysis and the rationality of the optimized conical axial blood pump structure.