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A-321 CFM56-5 Chevrons  
User currently offlineLiedetectors From United States of America, joined Jul 2005, 360 posts, RR: 0
Posted (4 years 11 months 1 week 2 days 18 hours ago) and read 5563 times:

Hello all,

I just noticed that Aeroflot's CFM-56-powered A-321, pictured in the link below, has chevrons in the vicinity of the exhaust nozzle. Does anyone know the story behind this? Is this an Airbus upgrade or a long-term test article? The next CFM56-powered 321 (of Air India) off of the line did not have chevrons.

http://www.airliners.net/photo/Aerof...Russian/Airbus-A321-211/1609608/L/


If it was said by us, then it must be true.
11 replies: All unread, jump to last
 
User currently offlineMir From United States of America, joined Jan 2004, 21677 posts, RR: 55
Reply 1, posted (4 years 11 months 1 week 2 days 17 hours ago) and read 5554 times:

Unrelated question (but related to the pic):

What are those two little ports about halfway up the back of the pylon for? They look like drains, but drains for what?

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (4 years 11 months 1 week 2 days 17 hours ago) and read 5550 times:



Quoting Liedetectors (Thread starter):
Does anyone know the story behind this?

Unfortunately, no. I'd love to hear the inside scoop!

Quoting Mir (Reply 1):
What are those two little ports about halfway up the back of the pylon for? They look like drains, but drains for what?

I don't know for sure, but you usually have a drain in that area for the strut. At least one to let fuel/water out so it doesn't pool in the strut and probably another one for hydraulics if they've got a pump or resevoir in the fairing (not sure if the A321 does, but some aircraft do).

Tom.


User currently offline747classic From Netherlands, joined Aug 2009, 2177 posts, RR: 14
Reply 3, posted (4 years 11 months 1 week 2 days 13 hours ago) and read 5485 times:

Quoting Tdscanuck (Reply 2):
I'd love to hear the inside scoop!

I found this article over the CFM56-5B engine, installed on the A321, on the CFM website.
The following is mentioned : "The technology being developed includes: three-dimensional aerodynamic outlet guide vanes; a core chevron nozzle; and improved reverser and inlet linings on the nacelle."

See : http://www.cfm56.com/press/news/cfm5...begins+full-scale+engine+tests/339

For further info :
http://www.aiaa.org/events/aners/Presentations/ANERS-Gliebe.pdf

[Edited 2009-11-16 01:14:16]


Operating a twin over the ocean, you're always one engine failure from a total emergency.
User currently offlineOly720man From United Kingdom, joined May 2004, 6808 posts, RR: 11
Reply 4, posted (4 years 11 months 1 week 2 days 10 hours ago) and read 5426 times:

http://www.airbus.com/store/mm_repos...dia_object_file_FAST37_p19_p22.pdf

It's an Airbus/CFM noise reduction device option that can be fitted. Could be that the noise rules in India are rather less onerous than in other places, hence the lack of them on the AI aircraft.

The more recent AF aircraft are fitted with them, though not always easy to see, e.g.

F-GTAR

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Photo © Sergio Domingos



F-GTAS

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Photo © Ruud Brinks



F-GTAV

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Photo © Daniel & Robert Fall




wheat and dairy can screw up your brain
User currently offlineLiedetectors From United States of America, joined Jul 2005, 360 posts, RR: 0
Reply 5, posted (4 years 11 months 1 week 2 days 5 hours ago) and read 5323 times:

Sweet! Thanks guys for the informative replies and links!


If it was said by us, then it must be true.
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 6, posted (4 years 11 months 1 week 1 day 21 hours ago) and read 5180 times:

Hmm never seen them before. Funny that its only on the 321s, you'd think it would be available on other CFM Airbii

User currently offlineKeta From Germany, joined Mar 2005, 448 posts, RR: 0
Reply 7, posted (4 years 11 months 1 week 1 day 15 hours ago) and read 5127 times:



Quoting FLY2HMO (Reply 6):
Hmm never seen them before. Funny that its only on the 321s, you'd think it would be available on other CFM Airbii

Right, why can't we see them in the A320? Neat feature anyway, never noticed it before!  Smile



Where there's a will, there's a way
User currently offlineGPHOTO From United Kingdom, joined Aug 2004, 831 posts, RR: 25
Reply 8, posted (4 years 11 months 1 week 1 day 15 hours ago) and read 5118 times:
AIRLINERS.NET CREW
DATABASE EDITOR

Chevrons in the exhaust section are becoming increasingly common. For example, I noticed these two recently:


View Large View Medium
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Photo © Jim Groom
View Large View Medium
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Photo © Jim Groom



As well as reducing noise, I would be interested in any effect it might have (positive or negative)on fuel economy or thrust?

Best regards,

Jim



Erm, is this thing on?
User currently offlineKeta From Germany, joined Mar 2005, 448 posts, RR: 0
Reply 9, posted (4 years 11 months 1 week 1 day 12 hours ago) and read 5083 times:



Quoting GPHOTO (Reply 8):
As well as reducing noise, I would be interested in any effect it might have (positive or negative)on fuel economy or thrust?

I have a figure for the fluted nozzles on the JT8D quoting 7 dB noise reduction with about 5-6% loss of thrust. This is kind of old, though; I'm pretty sure these serrations achieve better results.



Where there's a will, there's a way
User currently offline747classic From Netherlands, joined Aug 2009, 2177 posts, RR: 14
Reply 10, posted (4 years 11 months 1 week 1 day 9 hours ago) and read 5059 times:



Quoting FLY2HMO (Reply 6):
Hmm never seen them before. Funny that its only on the 321s, you'd think it would be available on other CFM Airbii

As stated in the article : http://www.airbus.com/store/mm_repos...dia_object_file_FAST37_p19_p22.pdf

The "noise package" is now standard on the A321 and an option on the other models.
The reason behind this is that the A321 (heavy weight version) doesn't comply with the new stage 4 noise limits in effect for all new aircraft, certified after 1 January 2007.
In fact this is the present noise standard, although legally not valid for the present A320 generation of aircraft, all certified before 1 januari 2007.
All other sub types of the A320 series are at or below the stage 4 noise standard and don't need the chevrons, but can be delivered as an option with this "noise package", to become even more silent.

Also stated in the article is the fact that the FADEC needs some tweaking to produce the same thrust level, so there must be a loss in efficiency somewhere.
Because this is an Airbus brochure, nothing is said about the actual loss in SFC.



Operating a twin over the ocean, you're always one engine failure from a total emergency.
User currently offlineEx52tech From United States of America, joined Dec 2006, 559 posts, RR: 1
Reply 11, posted (4 years 11 months 6 days 11 hours ago) and read 4837 times:



Quoting Mir (Reply 1):
What are those two little ports about halfway up the back of the pylon for? They look like drains, but drains for what?

Pylon drains, from different areas of the pylon, one is in the area where the lines hook up. Many airplane's pylon drains connect to the engine, and drain out of the gang drain on the engine.

The fairing just below those drains has a channel to drain any fluids out of the area in the aft section of the pylon.



"Saddest thing I ever witnessed....an airplane being scrapped"
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