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The compressed air is heated in the combustor and passes through the turbine, then expands in the nozzle to produce a high speed propelling jet [3] Turbojets have a low propulsive efficiency below about Mach 2 [ citation needed ] and produce a lot of jet noise, both a result of the very high velocity of the exhaust.
The AS.12 originally entered service with the French Navy in 1960 in the air-to-surface role against ships and submarines on the surface. In 1966 the French Navy made an evaluation of the SS.11(M) and SS.12(M) from the fast patrol boat La Combattante. [1] In 1966, the Libyan Navy ordered three fast patrol boats from Vosper (Sebha, Sirte and Susa).
The type of jet engine used to explain the conversion of fuel into thrust is the ramjet.It is simpler than the turbojet which is, in turn, simpler than the turbofan.It is valid to use the ramjet example because the ramjet, turbojet and turbofan core all use the same principle to produce thrust which is to accelerate the air passing through them.
The propelling nozzle converts a gas turbine or gas generator into a jet engine. Power available in the gas turbine exhaust is converted into a high speed propelling jet by the nozzle. The power is defined by typical gauge pressure and temperature values for a turbojet of 20 psi (140 kPa) and 1,000 °F (538 °C). [18]
The air flowing into a turbojet engine is always subsonic, regardless of the speed of the aircraft itself. The intake has to supply air to the engine with an acceptably small variation in pressure (known as distortion) and having lost as little energy as possible on the way (known as pressure recovery).
Original schematic of a turboramjet design Recreated schematic of an air turboramjet, featuring; 1. compressor, 2. gearbox, 3. hydrogen and oxygen lines, 4. gas generator, 5. turbine, 6. ram burner fuel injector, 7. main combustor, 8. nozzle The air turboramjet engine is a combined cycle engine that merges aspects of turbojet and ramjet engines ...
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