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Questions tagged [geared-turbofan]

Is a kind of turbofan that uses a reduction gearbox between the low pressure shaft and the fan.

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7
votes
1answer
150 views

How will the Rolls Royce UltraFan provide reverse thrust?

When perusing the Wikipedia article on the upcoming Rolls Royce UltraFan engine, I noticed that it cited an interesting bit of information from an Aviation Week article: As the fan system is ...
-5
votes
1answer
143 views

What would happen if one smeared a generous amount of grease on the gears of the geared turbofan jet engine

What would happen if one smeared a generous amount of grease on all the gears or parts of the gearbox of the geared turbofan engine such that no tooth is left without grease to the extent that it is ...
-2
votes
1answer
65 views

At what temperatures would the gearing for geared turbofans be rendered unnecessary? [closed]

If geared turbofans were fitted with material science technologies or other engineering innovations that would allow them to operate at higher temperatures exceeding their current most optimum ...
0
votes
0answers
88 views

At what operating temperatures would the Trent 900 need to operate, to equate to the efficiency of current geared turbofans?

What is the minimum optimum operating temperature (in degrees Celsius) that would be required for the Trent 900 to operate at, for it to attain the level of fuel efficiency of current geared turbo ...
3
votes
1answer
250 views

Is it possible to add “planets” to the gearbox of a Trent 1000?

The gearbox of a geared turbofan engine has 4 reducing gear small wheels being spun by a larger wheel or gear, simultaneously spinning the shaft that is attached to the fan. That is 8 points of ...
3
votes
1answer
908 views

Can a turbofan have a fan driven electrically so as to run at optimal speed?

I just watched this pretty dumbed-down video about the idea of putting a gearbox in a turbofan so the fan can run at its optimum slower speed while the core runs at its optimum high speed. And I ...
4
votes
2answers
376 views

Off-center fan in geared turbofan - does this exist?

Has anyone ever heard of a geared turbofan in which the axis of rotation of the fan is offset from (i.e. not the same as) the axis of rotation of the turbine? In all the current geared turbofans I've ...
24
votes
7answers
7k views

Given the same engine, why install a gearbox on a turboprop but not on a turbofan?

I am reading the book Mechanics and Thermodynamics of Propulsion, by Hill and Peterson. I found out this image while reading the chapter 5, "Thermodynamics of Aircraft Engines": Why would there be a ...
8
votes
2answers
5k views

What are the limitations in adoptions of GTF (Geared Turbofan) technology?

The only recent engine using GTF technology is the PW1000G, however some old designs like ALF502 or TFE731 use this technology. I understand the basic concept of the benefit obtained by the engine ...