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Idle Fuel Burn Rates  
User currently offlineAA 737-800 From United States of America, joined May 1999, 199 posts, RR: 0
Posted (8 years 9 months 6 days 6 hours ago) and read 13139 times:

Does anyone know the approximate fuel burn rate at idle and at cruise for any common civil jet engines? Anything like RB211, CF6, CFM56, GE90, etc. would be greatly appriated. If no one knows, does anyone know who I might e-mail at the engine manufacturers for these facts? Thanks for all your help.


Civil engineering isn't about making things perfect...just better.
11 replies: All unread, jump to last
 
User currently offlineDoktor From Germany, joined Mar 2006, 29 posts, RR: 0
Reply 1, posted (8 years 9 months 5 days 16 hours ago) and read 13081 times:

Hi! I found something of 2.650-3.000 l/h for the CFM56 in cruise. But normally the rate is given in specific-fuel-consumption, which is calculated with kg/h/kN and data refers to TO --> max thrust (CFM56: 37,5kg/h/kN at 104.5kN). Due to the fact that the thrust depends on so many atmospheric conditions, your question is not that easy to answer...

Dok


User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 10
Reply 2, posted (8 years 9 months 4 days 12 hours ago) and read 12974 times:

The GE CF34-3B1 used on the CRJ-200 burns around 400lb/hr/engine at idle.

User currently offlineCYEGsTankers From Canada, joined Oct 2004, 245 posts, RR: 1
Reply 3, posted (8 years 9 months 3 days 7 hours ago) and read 12910 times:

Quoting UAL Bagsmasher (Reply 2):
The GE CF34-3B1 used on the CRJ-200 burns around 400lb/hr/engine at idle.

The GE CF-34-8C1 on the CRJ-700, is that a close amount compared to the 200 for burning idle fuel?

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User currently offlineCCA From Hong Kong, joined Oct 2002, 846 posts, RR: 14
Reply 4, posted (8 years 9 months 3 days 6 hours ago) and read 12906 times:

CF6-50 depending on aircraft weight 3,000-3,500 Kg/hr in the cruise, an RB211-524D4 is about 250kg/hr less. Just estimates off the top of my head will have to get back to you for idle.


C152 G115 TB10 CAP10 SR-22 Be76 PA-34 NDN-1T C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 10
Reply 5, posted (8 years 9 months 2 days 10 hours ago) and read 12828 times:

cYEGsTankers, I am not familiar with the -8C1's, as my airline only flies the CRJ-200's. Sorry!

User currently offlineRsbj From United States of America, joined Jan 2006, 153 posts, RR: 0
Reply 6, posted (8 years 9 months 2 days 3 hours ago) and read 12803 times:

All CFM56's burns 650-700 lb/hr/engine at sea level with bleeds open.


I fly really fast and take a lot of chances.
User currently offlineDoktor From Germany, joined Mar 2006, 29 posts, RR: 0
Reply 7, posted (8 years 9 months ago) and read 12765 times:

Found some more, these dates are stated as averages for the aircraft:

Concorde 4x RR/Snecma Olympus 593 (170kN): 25.629l/h
747-400 4x (different engines): 12.500l/h
767-300 2x (different engines): 5.800l/h
757-200 2x (different engines): 4.000l/h
737-400 2x CFM56-3C1: 2.850l/h
A340-300 4x CFM56-5C2: 8.300l/h
A310-300 2x GE CF6-80C2A2: 5.250l/h
A320-200 2x CFM56-5A1: 2.900l/h

I wouldn't trust these dates that much though...


User currently offlineSchooner From United Kingdom, joined Oct 2001, 139 posts, RR: 0
Reply 8, posted (8 years 8 months 3 weeks 6 days 16 hours ago) and read 12705 times:

RB-211 between approx 1.5 - 2.2 tonnes/hour depending on aircraft weight, cruise speed etc.

Cheers.



Untouched and Alive
User currently offlinePhollingsworth From United Kingdom, joined Mar 2004, 825 posts, RR: 5
Reply 9, posted (8 years 8 months 3 weeks 6 days 13 hours ago) and read 12683 times:

A GE90-92B with a DACII combustor burns 0.302 kg/s of fuel. It produces 0.37g of unburned hydrocarbons, 12.35 g of CO, and 5.92 g of NOx per kg of fuel burned at certification idle (7% of TO thrust). These are the certification numbers and an actual engine will probably do worse. The same engine burns 3.515 kg/s of fuel and produces 0.04 g HC, 0.15 g CO, and 55.9 g NOx per kg of fuel at the takeoff thrust of 426.72 kN.

This data is all available in the ICAO emissions databank:
http://www.caa.co.uk/default.aspx?categoryid=702&pagetype=90


User currently offlineFlyboy80 From United States of America, joined Jul 2001, 1880 posts, RR: 3
Reply 10, posted (8 years 8 months 3 weeks 5 days 17 hours ago) and read 12629 times:

how much does a gal of jet fuel weigh? Is 8lbs used to formulate weight and balance?

User currently offlineDoug_Or From United States of America, joined Mar 2000, 3442 posts, RR: 3
Reply 11, posted (8 years 8 months 3 weeks 5 days 17 hours ago) and read 12628 times:

6.7 lbs/gallon

FWWIW PW120A burns 260 @ normal idle and around 160 when feathered.



When in doubt, one B pump off
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