The Eaton Char-lynn Motor stated that the ramjet engine is an air jet engine that uses the oncoming airflow to enter the engine and decelerate to increase the pressure of the air. It is usually an air intake (also known as a diffuser), a combustion chamber, and a propulsion nozzle. composition. When the aircraft is flying, the oncoming airflow transforms the kinetic energy into pressure energy during the process of passing through the intake passage. After compression, it enters the combustion chamber and is mixed with the fuel for combustion. The generated high-temperature gas is expanded and accelerated in the nozzle to be discharged, generating thrust. The ramjet engine is simple in structure, light in weight, large in thrust-to-weight ratio, low in cost, and has good economy. However, it cannot be started by itself under static conditions, but other engines are needed as boosters. When the aircraft reaches a certain flight speed, it can work effectively. The ramjet engine can be used with rocket engines, turbojets and fan engines. When the take-off is started, the engine is started. When the flight speed is sufficient for the ramjet to work normally, the ramjet engine is closed and the engine is used. In the landing phase, when the flight speed of the aircraft is reduced to the ramjet engine, the engine is restarted.
The ramjet engine is divided into subsonic, supersonic, and hypersonic speeds: the subsonic ramjet engine uses a subsonic diffusing air inlet and a convergent nozzle, and uses aviation kerosene as fuel, and the flying Mach number is 0.5 to 1; supersonic stamping The engine uses a supersonic inlet (the subsonic inlet is a subsonic flow) and a convergent or convergent diffusing nozzle. The aviation kerosene or hydrocarbon fuel has a flying Mach number of 1-5. The hypersonic ramjet uses hydrocarbon. The fuel or liquid hydrogen fuel is burned in a supersonic gas stream with a flying Mach number of 5-16.
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