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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.
Podded engines on a Boeing 707. A podded engine is a jet engine that has been built up and integrated in its nacelle. This may be done in a podding facility as part of an aircraft assembly process. [1] The nacelle contains the engine, engine mounts and parts which are required to run the engine in the aircraft, known as the EBU (Engine Build Up).
An aircraft fuel system allows the crew to pump, manage, and deliver aviation fuel to the propulsion system and auxiliary power unit (APU) of an aircraft. Fuel systems differ greatly due to different performance of the aircraft in which they are installed. A single-engine piston aircraft has a simple fuel system; a tanker (such as the KC-135 ...
When the pilot wants more thrust the rate of increase in fuel flow that comes with moving the thrust lever (throttle) must not be too great but at the same time must be enough to accelerate the engine quickly without stalling the compressor. When reducing thrust the rate at which the fuel decreases must not be too quick or a flame-out will occur.
A jet engine is a type of reaction engine, discharging a fast-moving jet of heated gas (usually air) that generates thrust by jet propulsion. While this broad definition may include rocket , water jet , and hybrid propulsion, the term jet engine typically refers to an internal combustion air-breathing jet engine such as a turbojet , turbofan ...
This figure is inversely proportional to specific impulse, which is the amount of thrust produced per unit fuel consumed. TSFC or SFC for thrust engines (e.g. turbojets, turbofans, ramjets, rockets, etc.) is the mass of fuel needed to provide the net thrust for a given period e.g. lb/(h·lbf) (pounds of fuel per hour-pound of thrust) or g/(s ...
Afterburner-equipped engines may also open the nozzle for starting and at idle. The idle thrust is reduced which lowers taxi speeds and brake wear. This feature on the J75 engine in the F-106 was called 'Idle Thrust Control' and reduced idle thrust by 40%. [28] On aircraft carriers, lower idle thrust reduces the hazards from jet blast.
The high-speed version of the hose/drogue refueling system can be deployed at 185 knots (213 mph; 343 km/h) and function at up to 250 knots (290 mph; 460 km/h). A mix of tanks and a roll-on/roll-off bladder house up to 12,000 lb (5,400 kg) of fuel. The ramp must open to extend the hose, then raised once extended.