Cavitation Analysis Of The Valve Plate Pair Of The High-temperature Fuel Piston Pump

The fuel piston pump is the key coxponent of the aircraft fuel control system and is very important for the stability and reliability of the fuel control system.However,as the performance requirements of the fuel piston pump become higher,the cavitation in the piston pump seriously restricts its development.This thesis concentrates on the aircraft fuel piston pump.In this thesis,the working principle and characteristics of the swash-plate fuel piston pump are introduced,the mechanism and the influence factors of the cavitation are analyzed,and the effective improvement measures are proposed and validated.Through this research,the cavitation phenomenon of the fuel piston pump under high temperature conditions is effectively reduced,and the service life of the fuel pump is increased.The thesis is organized as follows:In chapter 1,the introduction of the fuel piston pump is outlined.The development history of swash-plate axial piston pump and the cavitation characteristics of the pump are introduced.The research status of the characteristics of axial piston pump cavitation in domestic and international scope is summarized,and the research contents and objectives are clarified.In chapter 2,the fluid characteristics of the high-temperature fuel piston pump is analyzed.The working principle and flow principle of the fuel piston pump are introduced.Based on the principle of cavitation dynamics,the dynamic characteristics of cavitation growth and rupture process are studied.At the same time,the influence of thermal effect on cavitation characteristics is analyzed.The mathematical model of cavitation of the fuel piston pump is established to provide theoretical basis for simulation analysis.In chapter 3,the cavitation simulation model of the high-temperature fuel piston pump is established.The three-dimensional flow field simulation model is established.The full-cavitation model of Pumplinx software is used to simulate the cavitation characteristics of the fuel piston pump.The effect of temperature on the cavitation characteristics of the fuel piston pump is analyzed.The gas volume,flow rate and pressure at different oil temperatures are compared and analyzed.The influence of temperature on the cavitation severity of fuel piston pump was investigated and summarized.In chapter 4,the optimized structures of the damper groove on the valve plate are proposed.The influence of structural parameters of triangular damper on pump cavitation is simulated and analyzed by Pumplinx software.Based on the flow principle,the influence of flow area change on the cavitation characteristics of fuel piston pup is analyzed.The scheme of optimizing the damper structure is proposed.By comparing and analyzing the simulations of the damper groove structure on the cavitation severity,the suggestions for optimizing the structure of the valve plate and reducing the cavitation of the pump are provided.In chapter 5,the previous chapters are summarized.The research achievements and innovation on the cavitation mechanism of the fuel piston pump are highlighted.Suggestions are also provided for the future work.