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Components of jet engines
This article describes the components and systems found in jet engines. It uses two example engines; the type most familiar to the general public, the modern airliner engine, and the military afterburning engine. The components and systems make up what is known as a bare engine.
The article also has a section on inlets. Although the inlet is not part of the engine, the engine relies on it to help prevent compressor surging (by reducing inlet distortion), and to give a pressure boost to the engine which reduces its fuel consumption (by converting the relative speed of the approaching air into pressure).
The article also mentions the nacelle because the outside of an airliner engine has to be streamlined so that as little of its thrust as possible is lost to the drag of the air flowing past the engine.
Engines for airliners are enclosed in a streamlined pod called a nacelle which hangs under the wing or, on smaller aircraft, on the side of the aircraft behind the wing.
The most fundamental part of the engine is the gas generator ( also known as the core) because every gas turbine engine needs one (it has 3 parts, compressor, combustion chamber and turbine). Early jet engines (turbojets) were just a gas generator until additional parts were added to reduce fuel consumption. In front was added a fan and, at the back, another turbine, both connected together by a shaft going through the middle of the gas generator, (and known as a fanjet, bypass engine, or turbofan).
For an airline passenger the gas generator is out-of-sight in the middle of the engine and all that can be seen of the engine itself are the fan at the front and the turbine for the fan at the back inside the core nozzle.
The major components of an airliner engine are shown on the 'Schematic of a high bypass turbofan'. The engine is identified as 2-spool. Spool is a name given to a complete rotor consisting of compressor, turbine and connecting shaft.
Two significant extra components are also used on modern airliner engines compared to the 2-spool arrangement shown above.
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Components of jet engines
This article describes the components and systems found in jet engines. It uses two example engines; the type most familiar to the general public, the modern airliner engine, and the military afterburning engine. The components and systems make up what is known as a bare engine.
The article also has a section on inlets. Although the inlet is not part of the engine, the engine relies on it to help prevent compressor surging (by reducing inlet distortion), and to give a pressure boost to the engine which reduces its fuel consumption (by converting the relative speed of the approaching air into pressure).
The article also mentions the nacelle because the outside of an airliner engine has to be streamlined so that as little of its thrust as possible is lost to the drag of the air flowing past the engine.
Engines for airliners are enclosed in a streamlined pod called a nacelle which hangs under the wing or, on smaller aircraft, on the side of the aircraft behind the wing.
The most fundamental part of the engine is the gas generator ( also known as the core) because every gas turbine engine needs one (it has 3 parts, compressor, combustion chamber and turbine). Early jet engines (turbojets) were just a gas generator until additional parts were added to reduce fuel consumption. In front was added a fan and, at the back, another turbine, both connected together by a shaft going through the middle of the gas generator, (and known as a fanjet, bypass engine, or turbofan).
For an airline passenger the gas generator is out-of-sight in the middle of the engine and all that can be seen of the engine itself are the fan at the front and the turbine for the fan at the back inside the core nozzle.
The major components of an airliner engine are shown on the 'Schematic of a high bypass turbofan'. The engine is identified as 2-spool. Spool is a name given to a complete rotor consisting of compressor, turbine and connecting shaft.
Two significant extra components are also used on modern airliner engines compared to the 2-spool arrangement shown above.