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What Is This On The Engine?

Gkyip From United Kingdom, joined Apr 2006, 163 posts, RR: 0
Posted (7 years 2 months 1 hour ago) and read 4942 times:

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

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Click here for bigger photo!

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

10 replies: All unread, jump to last

AirbusA346 From United Kingdom, joined Dec 2004, 7434 posts, RR: 2
Reply 1, posted (7 years 2 months 1 hour ago) and read 4908 times:

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 From United Kingdom, joined Apr 2006, 163 posts, RR: 0
Reply 2, posted (7 years 2 months 1 hour ago) and read 4847 times:

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 From , joined Dec 1969, posts, RR:
Reply 3, posted (7 years 2 months 1 hour ago) and read 4839 times:

it's called a 'chine' this question was answered long ago in tech/ops and re-iterated/answered in mil/space recently.

RobTrent From United Kingdom, joined Dec 2005, 260 posts, RR: 0
Reply 4, posted (7 years 2 months 1 hour ago) and read 4792 times:

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 From United Kingdom, joined Jun 2005, 533 posts, RR: 5
Reply 5, posted (7 years 2 months 1 hour ago) and read 4775 times:

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

They all have it!
Cheers bouncy

Christel Sinsen Photography

YYZYYT From Canada, joined Apr 2005, 858 posts, RR: 0
Reply 6, posted (7 years 2 months 1 hour ago) and read 4729 times:

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 From United Kingdom, joined Dec 2005, 260 posts, RR: 0
Reply 7, posted (7 years 2 months 1 hour ago) and read 4712 times:

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 From United Kingdom, joined Apr 2006, 163 posts, RR: 0
Reply 8, posted (7 years 2 months ago) and read 4653 times:

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 From United Kingdom, joined Dec 2005, 260 posts, RR: 0
Reply 9, posted (7 years 2 months ago) and read 4576 times:

No Worries ! Ask Away veryhappy

T7 - You know it makes sense !

Mav75 From United States of America, joined Dec 2000, 228 posts, RR: 1
Reply 10, posted (7 years 1 month 4 weeks 1 day 2 hours ago) and read 4116 times:

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

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