# Numerical Calculation and Experimental Study of the Axial Force of Aero Fuel Centrifugal Pumps
3 AEC Guizhou Honglin Aero-Engineinging Control Technology Co., Ltd., Guiyang 550009, China 2  
[PERSON]  
3 AVIC Jinchong Nanjing Engineering Institute of Aircraft System, Nanjing 211100, China; [EMAIL_ADDRESS]  
[PERSON]  
1 College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; [EMAIL_ADDRESS] (S.Y. ); [EMAIL_ADDRESS] (M.L. ); [EMAIL_ADDRESS] (L.X.) 3 AEC Guizhou Honglin Aero-Engineinginging Control Technology Co., Ltd., Guiyang 550009, China 2  
[PERSON]  
3 AVIC Jinchong Nanjing Engineering Institute of Aircraft System, Nanjing 211100, China; [EMAIL_ADDRESS]  
[PERSON]  
1 Collegecalculation of flow field in centrifugal pumps by using computational fluid dynamics (CFD). Based on the CFD method, [PERSON] [20] numerically simulated the internal flow field of a submersible centrifugal pump used in a certain type of well, obtained the pressure distribution of the axial end face of the pump and the surface of the impeller, and then calculated the axial force of the pump. The error between the results and the test was small, indicating that the method of using numerical simulation to predict the axial force of the pump is feasible. [PERSON], [PERSON], et al. [21; 22; 23; 24] used the numerical analysis method to conduct orthogonal tests on the factors affecting the axial force of the semi-open centrifugal pump and found that the axial force of the centrifugal pump could be greatly reduced by reducing the tip clearance size and opening a balance hole. [PERSON] [25] compared the theoretical calculation value of the axial force of a high-speed mine centrifugal pump with the experimental value. The results showed that the traditional theoretical formula could not accurately calculate the axial thrust value of a high-speed mine centrifugal pump due to the complex flow in the impeller, while the numerical simulation value was close to the experimental value. [PERSON] [26] combined the CFD method with theoretical formula calculation and proposed a hybrid method for calculating multi-stage pump axial thrust, which not only saved the simulation time but also improved the accuracy of the empirical formula. It can be seen that the numerical simulation method to calculate the axial force of a centrifugal pump has been widely used. At present, there is relatively little research on the axial force of aero fuel centrifugal pumps. The numerical simulation method generally adopts a steady-state solution with low accuracy and there is a general lack of relevant accurate experiments for verification. In addition, compared with conventional centrifugal pumps, the centrifugal pump for aero-engine fuel systems operates at higher speeds, has a wider range of speed variation, and is equipped with an induction wheel at the inlet, making the flow field more complex. The study about axial force is of great significance for structural optimization and performance improvement in aero fuel centrifugal pumps. In this paper, the unsteady flow field in the aero fuel centrifugal pump was simulated based on the SST turbulence model and the axial force of the impeller was calculated first. Then, the position closed-loop control system was used to accurately measure the axial force and verify the accuracy of the numerical simulation. Finally, based on the simulation and experimental data, the calculation formula for the axial force of the fuel centrifugal pump was modified, which can provide a certain reference for the calculation and balance research of axial force in the aero fuel centrifugal pump.