Posts: 167
Joined: Thu Jun 03, 1999 3:05 am

Aviation fuel

Thu Mar 11, 1999 7:32 am

Is aviation very similar to Kerosene in its composition? Does it have a higher calorific value than gasoline (petrol). Why is more suitable for turbofans than gasoline?

RE: Aviation fuel

Thu Mar 11, 1999 8:39 am

Jet fuel is Kersene. I think it has a very high octane rating compard to regular gasoline. Therefore producing more power.
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RE: Aviation fuel

Thu Mar 11, 1999 10:14 am

Chemically, kerosene and jet fuel are the same. When they distill petorleum at the refinery, jet fuels are collected just before gasolines. The kerosenes are more dense than gasoline (gasolines have 5-11 carbon atoms per molecule, kerosenes have 9-16 carbon atoms per molecule). The kerosenes have a much higher octane, allowing them to burn slower than gasoline. In the jet engine, the fuel burns to accelerate air out the back and produce thrust. Fast-burning fuels like gasoline would waste most of their energy in the jet, beause they would just vaporize when they were ignited and wouldn't create a lot of force.
Force = mass x acceleration, so if a drop of gas takes longer to burn it has more opportunity to accelerate air throught the jet - the force of the thrust increases. I don't know if a jet can run on regular gasoline or not (I doubt it), but if it could it would basically just burn quickly to produce a lot of heat and noise without moving much air out the back of the engine.
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RE: Aviation fuel

Thu Mar 11, 1999 12:59 pm

Jet engines can burn av gas and can be used when Jet is not available.
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RE: Aviation fuel

Thu Mar 11, 1999 6:31 pm

Turbine fuel and Kero are similar. But kero lacks the additives and purity of Jet. It does not have a higher octane, you cant measure it in that value. You CANNOT use av gas in a turbine. after a very short time you would have a very expensive puddle of metal. But you can use diesel fuel in an emergency at an increased maintance cost and less performance.
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RE: Aviation fuel

Fri Mar 12, 1999 12:25 am

Thanks Guys, for the informative answers.
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Joined: Tue May 18, 1999 6:40 am

RE: Aviation fuel

Fri Mar 12, 1999 8:16 am

Jet engines CAN burn AV gas. If you want proof open up a King air or 1900 AOM and read it in black and white.
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RE: Aviation fuel

Fri Mar 12, 1999 9:04 am

There are some turbine engines that are specificly designed for AV-Gas. Specificly some of the turbine booster engines that where used on the B-36, C-119, KB-50, C-123, KC-97. Usually these were military aircraft that had high operating weights. The booster turbines on the C-123K are actually the same J-85 that are used of the F-5 fighter. Just a different series number. Most aviation turbines can still use av-gas as long as certain operating peramaters and conditions are met. If you exceed them then you do toast the engine.

All Kerosenes have about the same charicteristics. Doesn't matter if it is Home heating oil, Kerosene, JP-8, Diesel #1, Diesel #2, Jet A. The main differences are the amount of filtering, The amount of wax, and the amount of Water that is present in the fuel. Military JP-4 was about the only unique fuel because it was a mix of Kerosene and avgas. It has since been replaced by JP-8 since it was a very sparky mix.

Interestly enough when the US Navy first put jet fighters on Carriers they where really worried about having to stock two types of fuel onboard the ships (Av-gas and Jet-Fuel) then somebody found out you could make a pretty decent jet fuel by thining the Bunker C fuel that powered the ships boilers with the Av-gas that the Corsiar and Skyraider ground attack aircraft needed.
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RE: Aviation fuel

Fri Mar 12, 1999 11:05 am

Wow ! I would prefer more posts like these then all the "what's your favourite this or what do you think is the most that"-stuff on the forum !
That was veeeeeeery interesting !!

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