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ClarkeKent
Topic Author
Posts: 17
Joined: Wed Jan 23, 2019 12:40 am

Jet engines in the 2020s and 2030s.

Sun Apr 11, 2021 4:48 am

Hey guys,

As the title suggests, what are the big advances in propulsion heading into the 20s and into the 30s?

At the moment we have GE/Safran in a strong position with leap, especially given its popularity on the neo. But, what’s next for cfm and leap? My understanding is that cfm have focused on mainly engine core tech and materials, rather than the p&w approach of fan and gearbox tech. Cfm seem to be pushing the boundaries of temps and pressures with leap. What’s the next step? Gearbox?

GE. What happens after nx and 9x? I know they’re in very different size categories but which engine is more advanced. The nx came first but are there still technologies in this engine that haven’t yet transferred to the 9x?
Is an updated genx in the works for a 787 re-engine? What tech will it have? Where do the efficiency advances come from?

P&W. Is there any sign on Pratt on a wide body anytime soon? Apart from 767. What are they doing in house to prepare for the next advance in engine tech? Or are they relying on simply scaling up their gtf for a bigger aircraft? How advanced is the gtf core in comparison to leap or even 9x?

RR. Not sure where to start. Big issues on the T1000. How is the -10 variant going? How is the T7000 engine performing? And the xwb? From a tech standpoint, where do RR sit co pared the ge and Pratt?
I know they have ultrafan in the works. Apart from a gear box, will this be a fairly limited tech rise engine? Ie. xwb with a gb?

Sorry for all the questions. Just wanted to start a topic dedicated to the engines of the next 10-15 years.

:-)
 
GalaxyFlyer
Posts: 7391
Joined: Fri Jan 01, 2016 4:44 am

Re: Jet engines in the 2020s and 2030s.

Sun Apr 11, 2021 1:43 pm

We’re already in the 20s, so what you see is what you’re getting. We must be nearing the limits of chemistry and engine thermo- and aero-dynamics unless there’s a huge metallurgical advance.
 
744SPX
Posts: 425
Joined: Mon Jan 27, 2020 6:20 pm

Re: Jet engines in the 2020s and 2030s.

Mon Apr 12, 2021 5:44 pm

Open Rotor. Ever higher turbofan BPR's are going to come with ever diminishing returns until they hit the point where the cowl drag (and weight) is so massive that further gains of any significance in subsonic engine efficiency can only come from open rotor.
 
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DocLightning
Posts: 22135
Joined: Wed Nov 16, 2005 8:51 am

Re: Jet engines in the 2020s and 2030s.

Mon Apr 12, 2021 7:23 pm

744SPX wrote:
Open Rotor. Ever higher turbofan BPR's are going to come with ever diminishing returns until they hit the point where the cowl drag (and weight) is so massive that further gains of any significance in subsonic engine efficiency can only come from open rotor.


Noise, safety, and speed. I don't see how these get resolved with an open rotor.
-Doc Lightning-

"The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars."
-Carl Sagan
 
744SPX
Posts: 425
Joined: Mon Jan 27, 2020 6:20 pm

Re: Jet engines in the 2020s and 2030s.

Mon Apr 12, 2021 11:36 pm

Speed can get resolved, if the NASA ATP program is any indicator, (double digit efficiency advantage over equivalent tech turbofan engines up to .9 mach) but noise and safety will require some creativity and may never be satisfactory for everyone. None of the current open rotor designs/proposals use the ultra-high sweep blade design of the ATP which was optimized for mach .82-.84.

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