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Glowing Rings Of Afterburners  
User currently offlineTupolev154B2 From United States of America, joined Jun 2000, 1332 posts, RR: 2
Posted (14 years 9 months 1 week 4 days ago) and read 2070 times:

Why do afterburners produce some sort of glowing rings in the cone extending from the exhaust pipe when they are on?

3 replies: All unread, jump to last
User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 9 months 1 week 3 days 20 hours ago) and read 2034 times:

They are shock waves created by the supersonic airflow exiting the afterburner.

User currently offlineAeroguy From United States of America, joined Aug 2001, 69 posts, RR: 0
Reply 2, posted (14 years 9 months 1 week 3 days 8 hours ago) and read 2032 times:

Yes, those rings you are seeing are caused by a series of expansion waves and oblique shock waves within the exhaust jet. They are constantly reflected off the boundary surface (which is the interface between the high speed jet and the surrounding air). An oblique shock reflects off the boundary surface and becomes an expansion wave and an expansion wave reflects off the boundary surface and becomes an oblique shock. These reflections, shock diamonds I guess you could call them, deflect the air flow in the jet and actually cause changes in diameter of the boundary surface. You can actually see this if you look closely and observe that the jet doesn't have a constant diameter, but rather bulges in and out. A really interesting phenomenon, I haven't found any pictures of it on Airliners.net, maybe some other people have...

User currently offlineTupolev154B2 From United States of America, joined Jun 2000, 1332 posts, RR: 2
Reply 3, posted (14 years 9 months 1 week 3 days 6 hours ago) and read 2013 times:

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