CF6 Fuel Nozzles

[Obi Offiah]

I understand that the CF6 has 30 fuel nozzles feeding the combustor. Isn't this an unusally high number and would it have anything to do with the fuel nozzle switching/scheduling the engine performs.

Does anyone have any pics of the combustor.

Obi

[B-HKD]

http://img196.imageshack.us/img196/2908/picture6kkb.png

[barit1]

I believe the No. of nozzles may vary between models - CF6-6, -50, -80A, -80C2 etc. The -80 combustor is only half the length of earlier models.

[Piper19]

CF6-80C has 30 nozzles, some provide bigger flow for flameout protection, other operate when ignition is on. CF6-50 also 30 nozzles, some dual flow, others secondary flow only.
Compared to PW2000 (24 nozzles) and RB211 (15 nozzles), this is a high number indeed, I don't know why, but I suspect it's only a matter of manufacturer philosophy.

[Obi Offiah]

B-HKD, I already have that image. I am looking for a rear view of the combustor, preferably a real photo but a diagram should suffice. Thanks all the same.

I've found out that the fuel nozzle staging is used for lean blowout control as well as for improved starting and relight operation. My understanding is taht there are three staging modes for the CF6-50

Also it seems the GE90 also has 30 dual fuel nozzles for NOx emission control, giving a total of 60 nozzles.

Obi

[One Outsider]

On the CF6-50 there are two nozzle layouts. The low emission version has more duplex nozzles

http://i715.photobucket.com/albums/ww154/one_outsider/Lowemission.jpg

http://i715.photobucket.com/albums/ww154/one_outsider/Standard.jpg

http://i715.photobucket.com/albums/ww154/one_outsider/plumbing.jpg

[Obi Offiah]

Thanks One Outsider.:ok: