Study On The Scheme And Stability Pressure Characteristics Of The Digital Proportional Valve Used In The Fuel Tank Of The Missile Engine

Liquid-fueled missiles are one of the important research targets for strategic weapons around the world,where the research on key technologies of engine systems that govern missile flight has been a hot spot in the missile field.The missile engine system includes the engine,propellant,storage tank and delivery system,and the delivery system has a pressure reducer controlling the propellant supply rate.In this paper,the reducer on the engine system is studied and a signal-controlled pneumatic digital proportional valve is applied to the fuel tank for the bomb.Digital proportional valve is a kind of gas pressure reducer based on signal control,which constantly adjusts the spool opening to regulate the outlet pressure through signal feedback.Because of its easy operation,simple structure,good processability and outstanding performance,it has become one of the most cutting-edge products in the field of pneumatics at present.According to the design index,a digital proportional pressure reducing valve applied to the propellant supply system of missile engine is developed by the combination of structural design,simulation analysis and experimental study.The simulation and test results show that the digital proportional valve meets the requirements in all aspects of performance indicators and can meet the needs of the missile pressure reducer,with a pressure control accuracy of ±0.01 MPa,response time less than 0.1s,and operating linearity maintained at ± 1% F.S.The main research contents are as follows.(1)Review of literature to describe the development of domestic and foreign missiles,the importance of liquid missiles,the analysis of the propellant supply system on the flight attitude of the missile,the proposed a digital control of the pressure reducer,will be applied to the liquid missile tank.And an overview of the development of pneumatic pressure reducers at home and abroad,summarize the pneumatic digital proportional valve research process,research content,development trend,and conclude that there is still a technology gap between domestic and foreign,domestic research on digital proportional valve failed to involve the military industry.(2)Research on the digital proportional valve program.Including working principle analysis,structural design,parameter analysis,strength checks and other work,to lay a solid foundation for the simulation and testing of digital proportional valves.(3)Mathematical modeling and theoretical analysis of the digital proportional valve.Establish the static characteristic equation,pneumatic flow equation,gas temperature and pressure differential equation,gas continuity equation,of the digital proportional valve.(4)AMESim modeling and simulation.By changing the parameters of the pilot chamber volume and outlet flow rate of the digital proportional valve,the time-pressure variation relationship of the valve outlet is simulated and the factors affecting its static and dynamic characteristics are analyzed.(5)The principle of test system composition,test platform construction process and test equipment used are introduced.The actual performance of the digital proportional valve was tested through static and dynamic characteristics tests at room temperature and low temperature,and it was determined that the digital proportional valve has practical application value for the fuel tank for ammunition.(6)The work is summarized,and a reasonable analysis and future outlook are made on the research shortcomings.