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looks like al-31 to me. ws-10 has larger diameter, shorter and the nozzle is not dark. the pic post by cirr
above is ws-10.
It is the WS-10 engine with the black nozzle.
Actually, many WS-10 engines have the black nozzle if you have seen more pics of these engines on many different aircrafts.
And the nozzle diameter can both shrink and enlarge, it won't look always the same.
It's still AL-31
This J-15 No. 554 was with WS-10H before, there's plenty of pics of it.
But lately it's engines have been replaced by AL-31.
Still need time to see WS-10H operational on CV-16
What is the problem with the WS-10?
Is it currently unreliable?