Advanced technology engine

Advanced technology engine is a term given to the modern generation of jet engines,[1] used initially on the airbuses and 'jumbo jets' but also now finding other applications. The principle is that a turbine engine will function more efficiently if the various sets of turbines can revolve at their individual optimum speeds, instead of at the same speed.

## Contents

* 1 Details
* 2 Rolls Royce Ultrafan
* 3 See also
* 4 References

## Details

The true advanced technology engine has a triple spool, meaning that instead of having a single drive shaft, there are three, in order that the three sets of blades may revolve at different speeds. An interim state is a twin-spool engine, allowing only two different speeds for the turbines. The advantages of the advanced technology engine lie mainly in their low noise levels, although the use of new materials, such as carbon fibers, will in due course also lead to lighter and more economical power plants.

## Rolls Royce Ultrafan

The Rolls Royce Ultrafan claims to be the largest and most efficient jet engine to use this technology. The turbines behind the main fan are small and allow a good volume of 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] It is currently still in the testing stage.

## See also

* Index of aviation articles

## References

1. ↑ Wragg, David W. (1973). A Dictionary of Aviation (first ed.). Osprey. p. 4. ISBN 9780850451634.
2. ↑ "World's largest and most efficient aircraft engine aces first tests" (in en-US). 2023-05-22. https://newatlas.com/aircraft/rolls-royce-ultrafan-testing/.

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Jet engines and aircraft gas turbines

Gas turbines
and jet propulsion|

| Types|

* Propfan
* Turbofan
* Turbojet
* Turboprop
* Turboshaft
* Ramjet
* Rocket

|

Mechanical
components|

* Accessory drive
* Air intake
* Afterburner (reheat)
* Axial compressor
* Centrifugal compressor
* Combustor
* Constant speed drive
* Propelling nozzle
* Turbine blade

Principles|

* Aircraft engine starting
* Bleed air
* Brayton cycle
* Bypass ratio
* Compressor stall
* Engine pressure ratio (EPR)
* Flameout
* Jet engine performance
* Overall pressure ratio
* Propulsive efficiency
* Specific impulse
* Thrust
* Thrust lapse
* Thrust specific fuel consumption
* Thrust to weight ratio
* Variable cycle engine
* Windmill restart

Propellers|

| Components|

* Propeller governor
* Propeller speed reduction unit

|

Principles|

* Autofeather
* Blade pitch
* Constant-speed
* Contra-rotating
* Counter-rotating
* Proprotor
* Scimitar
* Variable-pitch

Engine
instruments|

* Annunciator panel
* Electronic centralised aircraft monitor (ECAM)
* Electronic flight instrument system (EFIS)
* Engine-indicating and crew-alerting system (EICAS)
* Flight data recorder
* Glass cockpit

Engine controls|

* Autothrottle
* Full Authority Digital Engine/Electronics (FADEC)
* Thrust lever
* Thrust reversal

Fuel and induction
systems|

* Jet fuel

Other systems|

* Air-start system
* Auxiliary power unit (APU)
* Bleed air system
* Hydraulic system
* Ice protection system

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Heat engines

* Carnot engine
* Fluidyne
* Gas turbine
* Hot air
* Jet
* Minto wheel
* Photo-Carnot engine
* Piston
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* Stirling
* Thermoacoustic

* Beale number
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* Timeline of heat engine technology

Thermodynamic cycle

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