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According to this site it is a MAK-UL IR Threat Warning System, an infrared based missile approach warning system. Here is a closer picture: (picture by Miroslav Gyűrösi)


I think it's a fairly good match for the Rolls Royce F405 Ardour. I can't quite work out which version though.... Thanks to everyone who spent time looking. here's an afterburner and nozzle for a variant: Hunini


On depictions of the CFM56 combustion chamber, that's part of the cross-section depiction of the diffuser.


They appear to be "Stall Strips" and are used to trigger a "premature" flow separation of the section of area of wing affected, that is, stall that section, before the rest of the wing gets to its natural stalling angle of attack. Usually you see them near the wing roots but for some reason BAE saw fit to put them a little farther ...


Those inlets don't require the NACA duct profile because the openings are presented toward the airflow, being on a sloping surface relative to the freestream. The NACA profile in those locations serves no useful purpose and is a probably less effective, if anything. The NACA duct profile was developed for inlets on surfaces that are completely parallel to ...


This answer says that it is the ram air inlet for the cabin air conditioning. My take is that they've changed the design from the NACA duct to make it open and close on demand. It is harder to make a variable NACA duct due to the curvatures involved.

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