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Patriot
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 Posted: Oct 26, 2007 - 10:53 PM
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Senior member
Joined: Sep 02, 2006 - 06:48 PM
Posts: 254
Location: Poland
Status: Offline
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Hi Guys,
I noticed recently that flame colour of afterburner of the F100 -229 model is quite different than the older F100 -220/E model. The older one have dusk-orange ab flame, while the -229 have ligt blue/yellow colour.
Could somebody explain the reason(s) for such difference in the ab's flame colour between this two engines ?
To illustrate (F-15):
-220:
-229:
O btw, what makes that circle rings into the pillar of burner flame ? Sound wave or smomething...?
Thanks for help  . |
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Great Balls Of Fire
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Sponsor
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 Posted: Jun 19, 2013 - 9:20 PM
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F-16.net Sponsor
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Guysmiley
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Posted: Oct 26, 2007 - 11:56 PM
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Elite 1K
Joined: May 26, 2005 - 08:39 PM
Posts: 1496
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That_Engine_Guy
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Posted: Oct 27, 2007 - 04:33 AM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
Posts: 2208
Location: Under the engine somewhere.
Status: Offline
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Gus has it exactly. 
Exhaust gas velocity makes the rings/disks. They are shock waves in the exhaust.
As for the color, it's the exhaust gas' temperature.
Just like any flame, blue is hotter than yellow or orange.
The PW-229 has a much more efficient augmentor than the PW-220. 
Great observation Patriot!
I can't wait to see the T-Birds in 2009 with their PW-229 powered Blk52s!  |
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sferrin
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Posted: Oct 27, 2007 - 06:34 AM
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Elite 1K
Joined: Jul 22, 2005 - 04:23 AM
Posts: 1616
Status: Online!
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That_Engine_Guy wrote:
Gus has it exactly.
Exhaust gas velocity makes the rings/disks. They are shock waves in the exhaust.
As for the color, it's the exhaust gas' temperature.
Just like any flame, blue is hotter than yellow or orange.
The PW-229 has a much more efficient augmentor than the PW-220.
Great observation Patriot!
I can't wait to see the T-Birds in 2009 with their PW-229 powered Blk52s!
The thing I don't get is why one time an engine's exhaust might appear blue and others orange. I've seen B-1's in afterburner both with blue and orange, pictures of both the F100-232 and F135 on the test stand with almost violet flames yet the F135's flame is orange most of the time when you see it in the aircraft.  |
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That_Engine_Guy
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Posted: Oct 27, 2007 - 06:57 AM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
Posts: 2208
Location: Under the engine somewhere.
Status: Offline
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You'll get some variance based on atmospheric conditions as air density affects the engine's ability to create thrust to some degree.
Some older engines will also loose efficiency due to deterioration of the the engine and/or deposits in their augmentor fuel systems. (PW-220s require the augmentor spray manifolds to be baked to remove carbon deposits on a scheduled basis.) This will cause the color of the flame to vary between engines of the same type.
The angle at which you view the flame and the background color will affect the flame's visibility to your eye or camera as well.
On a sunny day in a nice blue sky it is very difficult to see the blue components of a PW-229's flame, only the yellow portions can be seen. Take that very same aircraft/engine into the test cell, with limited lighting, and steel interior walls and the blue becomes very evident...  |
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[Airplanes are] near perfect, all they lack is the ability to forgive.
— Richard Collins
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Crowbar
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Posted: Oct 27, 2007 - 10:39 AM
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Newbie
Joined: Sep 17, 2006 - 10:52 PM
Posts: 11
Status: Offline
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I wonder when & where did you notice it Patriot (eNwings)  |
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F16JOAT
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Posted: Nov 06, 2007 - 06:53 PM
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Active Member
Joined: Apr 10, 2007 - 10:16 PM
Posts: 110
Status: Offline
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| You never mentioned if the fule was running with the new additive requirements of 100. |
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