Design and Simulation of Large Flowrate Fuel Metering Valve of Aero engine Based on AMESim

Large flowrate fuel metering valve is a critical regulating unit in the afterburner of aero-engine. Study on the flowrate metering valve is essential for optimizing the flight envelope of aero-engine. Addressing the problem of the low control accuracy of fuel flowrate, this paper proposes a new double control chamber metering valve to improve the pressure sensitivity and decrease the zero position error of the electrohydraulic servo valve. Meanwhile, by adding the damping piston in the main stage of constant pressure difference compensation valve, the pressure difference variation between inlet and outlet of the metering valve can be suppressed effectively. Firstly, mathematical models of the metering valve are derived. Then, the optimized system can be built on the AMEsim platform to analyze the pressure-flow characteristics. The result indicates the new large flowrate fuel metering valve has better performance than the original one in flowrate stability and control accuracy. The conclusion is of essential guidance for the optimum structural design and intelligent control of the metering valve.