Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Afterburner Stages  
User currently offlineTlfd29 From United States of America, joined Jul 2005, 81 posts, RR: 0
Posted (8 years 3 weeks 1 day 3 hours ago) and read 2687 times:

What does it mean when they say an aircraft has a six stage afterburner? What are the stages composed of? Are there engines with less or more stages?

3 replies: All unread, jump to last
 
User currently offlineBoeingfixer From Canada, joined Jul 2005, 534 posts, RR: 0
Reply 1, posted (8 years 3 weeks 1 day ago) and read 2656 times:

Stages are actually know as Zones. Zones are essentially separate fuel spay manifolds before the AB flame holder that allow more control over the AB power output. If less AB is required, only 1 zone could be used. As more AB power is required the additional zones will be activated by the FADEC or AB fuel control unit. Early AB's had only one stage or zone = on or off. There can be anywhere from 1 zone to 6+ zones depending on engine type.

Cheers,

John



Cheers, John YYC
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 3 weeks 16 hours ago) and read 2609 times:

To my knowledge, stages or zones on the afterburner allow more lee-way in terms of afterburner-control.

In the old days, the afterburners were basically ON or OFF, and guzzled a thousand pounds of fuel every minute. Adding some ability to have more control of the afterburner, the J-79 was fitted with a modulated afterburner with five different settings. The highest setting had the most thrust and fuel burn. The J-75, at least some models, featured a Min-AB, in addition to a Max AB setting.

The J-58 used on the blackbird, has vernier control over the afterburner; able to regulate it just like one would regulate the engine RPM.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17190 posts, RR: 66
Reply 3, posted (8 years 3 weeks 13 hours ago) and read 2579 times:

Quoting Blackbird (Reply 2):

In the old days, the afterburners were basically ON or OFF, and guzzled a thousand pounds of fuel every minute.

Not to mention being like an elephant kicking you in the kidneys when it was punched on.

Apart from the modulation ability mentioned above, zoned afterburners have a gentler transition from no afterburner to full (and back) is gained. This is better for both the airframe and the pilot. Note that it doesn't take two minutes, but even a subsecond zone stagger will make the transition much smoother.



"There are no stupid questions, but there are a lot of inquisitive idiots."
Top Of Page
Forum Index

Reply To This Topic Afterburner Stages
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
MD80 Engine "Stages" posted Thu Jul 29 2004 22:19:18 by Bigphilnyc
Take Off Stages/phases posted Fri Feb 27 2004 05:45:06 by Fly727
Noise "Stages" And Rules posted Thu Sep 25 2003 20:38:49 by Bigphilnyc
How Does An Afterburner Work? posted Tue Aug 24 2004 18:13:52 by Dancerrada
Stages To Landing An Aicraft posted Tue Dec 3 2002 21:23:43 by GF-A330

Sponsor Message:
Printer friendly format