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Author Topic: Airbus - one that may have made it into production...  (Read 1804 times)

Offline Trident

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Airbus - one that may have made it into production...
« on: July 08, 2016, 03:53:39 pm »
Aircraft comprising a central fairing that adjusts the pressure on the wing structures by means of local geometric deformations
US 20090078830 A1

"An aircraft including: a fuselage and two wings to which engine nacelles are attached and that are each connected laterally to the fuselage, one on each side thereof, by a central fairing. The central fairing includes, facing each wing, two opposed surfaces connected one to a suction face side and the other to a pressure face side of the wing and that extend longitudinally along the fuselage. At least one of the two surfaces includes at least one local geometric deformation configured to generate lateral aerodynamic disturbances on the central fairing toward the wing to control the flow of air over the wing."

http://www.google.ch/patents/US20090078830

Granted in 2009, and picked up by flightglobal immediately:

https://www.flightglobal.com/news/articles/airbus-develops-wing-fairing-to-reduce-larger-engine-324808/

As alluded to in that article, the technology seems to be in service today on the A320NEO - which is how I became aware of the patent actually. Saw the following photos of an IndiGo NEO:

http://www.bangaloreaviation.com/wp-content/uploads/2016/03/IndiGo_A320neo_VT-ITC_FUSELAGE_DSC_6126_2560px_WM.jpg

http://s1.ibtimes.com/sites/www.ibtimes.com/files/2015/10/27/indigo.jpg

Note the bump in the wing/fuselage fairing in the area of the over-wing emergency exits? Now, it's hard to find good quality images showing the same view on a CEO, but I'm pretty sure it was not there originally. Well, late model CEOs do appear to have it (incorporated for increased commonality to smooth the switch to the new model, possibly even with a minor drag reduction even without the big engines?):

http://farm3.staticflickr.com/2871/12187264424_9750981db5_b.jpg

(Note V2500s, but sharklets argue a very recent frame)

Might this also be the idea behind the rather radical contouring of the wing/fuselage fairing on the Boeing 787 (which obviously also has some seriously big engines), including - unlike the A320 - below the wing?

EDIT: I keep finding images showing CEOs *with* the bump, but most are clearly recent builds and at last I've also tracked down photos showing airframes *positively* WITHOUT the bump:

http://www.airplane-pictures.net/photo/371458/vn-a555-jetstar-pacific-airlines-airbus-a320/

http://3.bp.blogspot.com/-RwGnKzsKiXo/TZtB4B15B_I/AAAAAAAACzI/VscwUb2Phbw/s1600/DSC09272.JPG

https://www.runwaygirlnetwork.com/wp-content/uploads/2015/06/An-A319-meant-a-relatively-speedy-boarding-process-on-the-cut-down-narrowbody.jpg

https://freakyflier.files.wordpress.com/2012/08/imgp4177.jpg

So I'm not imagining things after all :)
« Last Edit: July 08, 2016, 04:23:14 pm by Trident »

Offline AeroFranz

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Re: Airbus - one that may have made it into production...
« Reply #1 on: July 09, 2016, 09:46:16 am »
Interesting stuff - Airbus found a way to get sensible drag reduction in an area that requires no major surgery, the fairings being non-structural members.
If I hadn't seen this post, i would have thought that the local thinning of the fairing was simply due to the intersection of the fuselage with the thickest part of the airfoil and the resulting geometric condition, not some aero treatment. Cool  :)
All modern aircraft have four dimensions: span, length, height and politics.   TSR.2 got the first three right - Sir Sydney Camm

Offline Trident

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Re: Airbus - one that may have made it into production...
« Reply #2 on: January 27, 2017, 02:03:31 pm »
And with the next NEO, they've been at it again:

http://betteraviationjobs.com/BetterAviation/wp-content/uploads/2016/12/Airbus-A330-Neo.jpg

EDIT: somebody @ airliners.net made this rather instructive comparison between a CEO & a NEO prototype in an unpainted state a couple of weeks ago:

http://i191.photobucket.com/albums/z160/keesje_pics/A330%20NEO%20wingroot_zpsqboua7fk.jpg
« Last Edit: March 18, 2017, 03:49:27 am by Trident »