Design and Dynamic-Static Characteristics Analysis of Electric Fuel Pump Boost Valve

In response to the challenges of significant power loss and the difficulty in quickly blocking fuel reverse backflow in one-way valves used in electric fuel systems for aerospace engines, this paper proposes a pump boost valve with a main valve spool designed as a baffle structure and equipped with a backflow damping mechanism. The aim of this boost valve is to achieve flow distribution between the main and auxiliary fuel circuits during engine startup, thereby reducing ineffective power loss. The baffle spool design is implemented to block reverse fuel backflow, while the backflow damping mechanism is incorporated to regulate the dynamic and static characteristics of the boost valve. Based on the proposed design, the working principle is analysed, and a dynamic model is established using AMESim for the modelling and simulation study of the boost valve's dynamic and static characteristics. Comparative experiments are conducted between the newly designed boost valve and traditional boost valves, and the accuracy of the simulation model is validated through experimental verification. The experimental results confirm that the newly designed boost valve outperforms traditional valves in terms of reducing power loss and effectively blocking fuel reverse backflow. Additionally, through the analysis of parameters such as spring stiffness, spool diameter, and backflow damping hole, this study optimises the static and dynamic characteristics of the electric fuel pump. By optimizing these structural parameters, the performance of the electric fuel pump is improved, leading to enhanced stability and responsiveness.