Chengdu J-20 5th Generation Aircraft News & Discussions

[April.lyrics]

what is the engine of j-20

somebody says this one seems to be al-31 series.not confirmed。

 

[ChineseTiger1986]

somebody says this one seems to be al-31 series.not confirmed。

It is the time to stop listening those "神棍" from CD and Feiyang.

 

[S10]

somebody says this one seems to be al-31 series.not confirmed。

pupu made a bet that the engine was WS-10, but he later posted a thread and admitted he lost. I think it's fairly safe to say AL-31 is used on the prototype at the moment.

From what I can gather so far:

#2001 - Basic flight control tests (2011)
#2002 - Ground static stress test (2011)
#2003 - Avionics + EODAS + Radar (2012, confirmed by huzhigeng)
#2004 - Weapons intergration (est 2014)
#2005 - Finalized pre-production protoype with WS-15 (est 2016)

 

[houshanghai]

J20 was being tested yesterday.

THX TO dj1023(飞扬）

 

[ChineseTiger1986]

pupu made a bet that the engine was WS-10, but he later posted a thread and admitted he lost. I think it's fairly safe to say AL-31 is used on the prototype at the moment.

From what I can gather so far:

#2001 - Basic flight control tests (2011)
#2002 - Ground static stress test (2011)
#2003 - Avionics + EODAS + Radar (2012, confirmed by huzhigeng)
#2004 - Weapons intergration (est 2014)
#2005 - Finalized pre-production protoype with WS-15 (est 2016)

The WS-15 engine (170kn) gonna be tested on J-20 by 2012 according to Huzhigeng.

 

[Akasa]

Translate?

 

[IndoUS]

Sorry I haven't been through the whole thread but, just wanted to know how many test beds have been made to test the avionics on the aircraft. Plus is this the final design or will there be any more changes??


Thanks in advance

 

[CardSharp]

Translate?

Don't bother with the posters. Siegecrossbow said they came from a military themed amusement park not a museum.

 

[S10]

The WS-15 engine (170kn) gonna be tested on J-20 by 2012 according to Huzhigeng.

Nope, only avionics. The term he used was 全航电状态. WS-15 is not projected to enter trial anytime soon.

 

[marshall]

Sorry I haven't been through the whole thread but, just wanted to know how many test beds have been made to test the avionics on the aircraft. Plus is this the final design or will there be any more changes??

Thanks in advance

Nobody knows what "exactly" is being tested on each flight so avionics testing guesstimates are mostly educated guesses. I would be wary of so-called insider claims when well over 99% of these are simply speculation. Concerning whether this is the final design, considering first flight was only 11 months ago and the engine currently used is a stopgap measure to expedite testing, I speculate final design won't be ready until at least 2014 at the earliest, probably later.

 

[Tumba]

J20 was being tested yesterday.

THX TO dj1023(飞扬）

looks bulky...
probably the production version will be slimmer ... most of the prototypes leave ample space for extra modifications ... once finalize the production version will be slimmer ... great effort by Chinese ... will be really interesting to see the engine fitted in the production model...

 

[April.lyrics]

pupu made a bet that the engine was WS-10, but he later posted a thread and admitted he lost. I think it's fairly safe to say AL-31 is used on the prototype at the moment.

From what I can gather so far:

#2001 - Basic flight control tests (2011)
#2002 - Ground static stress test (2011)
#2003 - Avionics + EODAS + Radar (2012, confirmed by huzhigeng)
#2004 - Weapons intergration (est 2014)
#2005 - Finalized pre-production protoype with WS-15 (est 2016)

wow EODAS?!eager to seem some alien-looks helmets.

 

[ChineseTiger1986]

This claim of J-20 flying with AL-31 is nonsense, since J-20 never runs the compatible software with AL-31.

This crap is getting really tired. Anyway, people are free to believe whatever they want to believe.

 

[Lawrie]

Nobody knows what "exactly" is being tested on each flight so avionics testing guesstimates are mostly educated guesses. I would be wary of so-called insider claims when well over 99% of these are simply speculation. Concerning whether this is the final design, considering first flight was only 11 months ago and the engine currently used is a stopgap measure to expedite testing, I speculate final design won't be ready until at least 2014 at the earliest, probably later.

Indeed, it all depends on how the progress on new engines is made so far. So the final design will be different. I also read that 606 institute of Shenyang is working on 2-D convergent-divergent vector nozzles. We will see.

 

[gambit]

Indeed, it all depends on how the progress on new engines is made so far. So the final design will be different. I also read that 606 institute of Shenyang is working on 2-D convergent-divergent vector nozzles. We will see.

There is a reason why: F-22.

No, am not saying the Chinese designers are simply copying the F-22, but the reason why the F-22 has that nozzle design is because of an unclassified NASA research showing a direct relationship between nozzle design/shape and engine efficiency in the attempt to supercruise an aircraft. There is a difference between the 'supersonic dash' and 'supersonic cruise' nozzles with the latter actually being more sophisticated in design and construction. Most people laughs at the F-22's nozzles because it has a loss of overall thrust but they did not know about this relationship between nozzle shape and overall engine efficiency. The ability to supercruise by payment of some overall thrust loss is more than acceptable -- if there are engine power to spare.

"Wind tunnel testing of a supersonic cruise nozzle in subsonic ejector " by Jesse Thomas Jones

Wind tunnel testing of a supersonic cruise nozzle in subsonic ejector configuration

The convergent-divergent geometry necessary for cruise efficiency, will separate when operated at the lower nozzle pressure ratios associated with take-off and initial climb, causing unacceptable noise levels. One proposed solution is to comprise the divergent geometry of two rotatable clamshell bodies.

The 'clamshell bodies' are exactly what the F-22 has.

On the other hand, if China cannot come up with an engine that can produce sufficient thrust to exploit the supercruise nozzle design, then there is no need to change the J-20 as is.

Currently, there are three avenues for a jet engine to supercruise an aircraft:

- The SR-71 style of a complex inlet system where the majority of total power actually came from the inlets, in other words, the SR-71 can be accurately describe as 'sucking' its way through the air rather than through thrust.

- The Concorde method where the engines are in constant afterburn through the transonic region, then deactivate.

- A combination of sufficient thrust and nozzle shaping.

The third path has been elusive until now.