gkyip
Posts: 133
Joined: Mon Apr 03, 2006 2:13 am

What Is This On The Engine?

Sat Apr 22, 2006 5:00 am

well, was looking through photos and was wondering, what is the aerodynamic device on the engine of this 777?


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Photo © Mike Moores



I noticed it on the RR Trent series engines. I can only guess that they are some kind of vortex generator? That's only my guess though!

Anyone? much appreciated

Gary
The strength of the turbulence is directly proportional to the temperature of your coffee
 
airbusA346
Posts: 7284
Joined: Fri Dec 10, 2004 7:05 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:08 am

Do you mean that fin on the inside of the number two engine.

It is something to do with aerodynamics as far as I know.

Correct me if I am wrong.

And Welcome to A.net  bigthumbsup 

Tom.
Tom Walker '086' First Officer of a A318/A319 for Air Lambert - Hours Flown: 17 hour 05 minutes (last updated 24/12/05).
 
gkyip
Posts: 133
Joined: Mon Apr 03, 2006 2:13 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:31 am

thanks for the help, yes i mean that little fin. I was just wondering the implication and use of having this little fin. What it does for the aerodynamics etc. If it useful for aerodynamics, why don't all engines have it? What makes the trent need it and the others to do without it?

Gary
The strength of the turbulence is directly proportional to the temperature of your coffee
 
TedTAce
Posts: 9098
Joined: Sun Mar 27, 2005 12:31 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:33 am

it's called a 'chine' this question was answered long ago in tech/ops and re-iterated/answered in mil/space recently.
This space intentionally left blank
 
RobTrent
Posts: 255
Joined: Sun Dec 18, 2005 5:48 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:39 am

To Elaborate

Chine - The line which runs along the side of the hull of a flying-boat or a float, parallel to the keel and marks the change in angle between the side plating and the planing bottom.

Regards
R
T7 - You know it makes sense !
 
christeljs
Posts: 528
Joined: Wed Jun 01, 2005 11:08 pm

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:42 am

Don't all planes have this? But placed in different places on the engine. This fin is on the B777 GE, RR & PW! Boeing has it, Airbus has it, and McDonnell Douglas.

B777:

GE


RR


PW


They all have it!
Cheers  bouncy 
Christel A Photography
 
YYZYYT
Posts: 906
Joined: Tue Apr 05, 2005 12:41 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:49 am

as always an excellent discussion of this topic, compelte with opictures, in tech/ops:
RE: Purpose Of Cowling Fin (by OldAeroGuy Mar 12 2006 in Tech Ops)
 
RobTrent
Posts: 255
Joined: Sun Dec 18, 2005 5:48 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 5:53 am

Local instability of symmetrical rectangular tubes under axial compression
Lundquist, Eugene E
naca-tn-686
February 1939


--------------------------------------------------------------------------------

A chart is presented for the coefficient in the formula for the critical compressive stress at which cross sectional distortion begins in a thin-wall tube of rectangular section symmetrical about its two principal axes. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the chart. The deflection equation used in this method was selected to give good accuracy. The exact values given by solution of the differential equation were calculated for a number of cases and it was found that the energy solution was correct to within a fraction of 1 percent. The calculation of the critical compressive stress at stresses above the elastic range is also discussed. In order to demonstrate the use of the formulas and the chart in engineering calculations, several illustrative problems are included.

An Adobe Acrobat (PDF) file of the entire report:
UK: http://naca.central.cranfield.ac.uk/reports/1939/naca-tn-686.pdf
US: http://naca.larc.nasa.gov/reports/1939/naca-tn-686/
T7 - You know it makes sense !
 
gkyip
Posts: 133
Joined: Mon Apr 03, 2006 2:13 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 6:06 am

thank you for all your help, it is much appreciated. I will have to start to learn how to use these forums properly! thanks again, for putting up with me!

Gary
The strength of the turbulence is directly proportional to the temperature of your coffee
 
RobTrent
Posts: 255
Joined: Sun Dec 18, 2005 5:48 am

RE: What Is This On The Engine?

Sat Apr 22, 2006 6:28 am

No Worries ! Ask Away  veryhappy 
T7 - You know it makes sense !
 
mav75
Posts: 172
Joined: Mon Dec 25, 2000 10:02 am

RE: What Is This On The Engine?

Sun Apr 23, 2006 4:04 am

You can also find these on DC-10's and 737's.