Advanced technology engine is a turbine engine that allows different turbines to spin at different, individually optimum speeds, instead of at one speed for all. It became common in the 21st century.[1] It emerged on larger airplanes, before finding other applications.
One version has three drive shafts instead of the usual one. This allows the three sets of blades to revolve at different speeds. An intermediate design is a twin-spool engine, allowing two different speeds. ATE advantages allow lower noise levels.
Examplesedit
Rolls Royce Ultrafanedit
The Rolls Royce Ultrafan is the largest and most efficient engine to allow multiple turbine speeds. The turbines behind the main fan are small and allow more air to pass straight through, while a planetary gearbox "allows the main fan to spin slower and the compressors to spin faster, putting each in their optimal zones."[2]
In 2024 this startup announced its TurboElectric Adaptive Engine. Instead of a fixed gearbox, it uses an electric motor to turn the turbine(s) behind the fan at an ideal speed for each phase of flight. The company claimed it would support efficient take-off, subsonic, supersonic, and hypersonic speeds. The electric motor is powered by a generator in turn powered by a turbine. The approach relies on the improved power density of novel electric motors such as yokeless dual-rotor axial flux motors that offer far more kw/kg than conventional designs that were too heavy for such an application.[3]
Air flows in through a turbogenerator to produce electric power to power an electric motor. The electric motor adaptively controls the propulsion unit, allowing it to behave like a turbofan, turbojet, or ramjet depending on airspeed. In effect the engine can operate at any point along the specific impulse (Isp) curve - high Isp at low speed or low Isp at high speed.[4][3][5]
It is in some respects similar to turbo-electric marine engines that allow propellers to turn at a different speed than the steam turbines that power them.
^Côté, Andrew (February 28, 2024). "Astro Mechanica". x.com. Retrieved April 2, 2024.
April 10, 2024
advanced, technology, engine, turbine, engine, that, allows, different, turbines, spin, different, individually, optimum, speeds, instead, speed, became, common, 21st, century, emerged, larger, airplanes, before, finding, other, applications, contents, details. Advanced technology engine is a turbine engine that allows different turbines to spin at different individually optimum speeds instead of at one speed for all It became common in the 21st century 1 It emerged on larger airplanes before finding other applications Contents 1 Details 2 Examples 2 1 Rolls Royce Ultrafan 2 2 Other geared turbofans 2 3 Astro Mechanica 3 See also 4 ReferencesDetails editOne version has three drive shafts instead of the usual one This allows the three sets of blades to revolve at different speeds An intermediate design is a twin spool engine allowing two different speeds ATE advantages allow lower noise levels Examples editRolls Royce Ultrafan edit The Rolls Royce Ultrafan is the largest and most efficient engine to allow multiple turbine speeds The turbines behind the main fan are small and allow more air to pass straight through while a planetary gearbox allows the main fan to spin slower and the compressors to spin faster putting each in their optimal zones 2 Other geared turbofans edit Geared turbofans are also used in the following engines some still in development Garrett TFE731 Lycoming ALF 502 LF 507 Pratt amp Whitney PW1000G Turbomeca Astafan and Turbomeca Aspin and Aviadvigatel PD 18R Astro Mechanica edit In 2024 this startup announced its TurboElectric Adaptive Engine Instead of a fixed gearbox it uses an electric motor to turn the turbine s behind the fan at an ideal speed for each phase of flight The company claimed it would support efficient take off subsonic supersonic and hypersonic speeds The electric motor is powered by a generator in turn powered by a turbine The approach relies on the improved power density of novel electric motors such as yokeless dual rotor axial flux motors that offer far more kw kg than conventional designs that were too heavy for such an application 3 Air flows in through a turbogenerator to produce electric power to power an electric motor The electric motor adaptively controls the propulsion unit allowing it to behave like a turbofan turbojet or ramjet depending on airspeed In effect the engine can operate at any point along the specific impulse Isp curve high Isp at low speed or low Isp at high speed 4 3 5 It is in some respects similar to turbo electric marine engines that allow propellers to turn at a different speed than the steam turbines that power them See also editIndex of aviation articlesReferences edit Wragg David W 1973 A Dictionary of Aviation first ed Osprey p 4 ISBN 9780850451634 World s largest and most efficient aircraft engine aces first tests New Atlas 2023 05 22 Retrieved 2023 09 24 a b Keil Christian February 28 2024 Interview with Ian Brooke x com McCormick Packy April 1 2024 Astro Mechanica www notboring co Retrieved 2024 04 02 Cote Andrew February 28 2024 Astro Mechanica x com Retrieved April 2 2024 Retrieved from https en wikipedia org w index php title Advanced technology engine amp oldid 1217034164, wikipedia, wiki, book, books, library,
