LFMS quote about the J-20 from another thread …
Not much is known (if any at all) about J-20 IR suppression, especially in terms of the exhaust plume. Both F-22 and F-35 nozzles are further inwards compared to the J-20. The nozzle itself doesn’t seem to be any different from the regular AL-31FN nozzle. There is an F-35 style nozzle being tested in one of the J-20 prototypes and one J-10B/C prototype. But not sure whether this new nozzle is just for RCS reduction or whether it includes both RCS reduction and IR suppression. I think serious IR suppression might increase weight or require a redesign. This may not be possible until the WS-15 is ready.
If the next version of the J-20 is going to look like this (Image – *not sure about this), then it should incorporate F-22 style IR suppression.
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