15:1气氧/煤油变推力火箭发动机设计及试验

In order to improve the thrust adjustment level,broaden the use of propellant,enhance the control ability of thrust rocket engine,a GO₂/kerosene variable-thrust rocket engine based on mechanical positioning dual-modulation scheme was designed by using theoretical calculations and ground test methods. The performance of variable-thrust engine and pintle injector,as well as the adjusting effect of mechanical positioning dual-modulation scheme were studied. The results show GO₂/kerosene variable thrust rocket engine achieves stable combustion at 0.26~4.35MPa and generates 57.30~864.70N of thrust. Thrust variation ratio is 15. The maximum combustion efficiency is 97.14%. Besides,the flow control valve can accurately adjust the propellant flow and the pintle injector can actively control the injection pressure drop. Mechanical positioning dual-modulation scheme achieves the desired purpose. The variable thrust rocket engine shows the advantages of the mechanical positioning dual-modulation scheme in the application of the deep variable-thrust technology.