Re: Tired of bumping along to Oshkosh?

On Sat, 06 Aug 2005 13:57:33 -0400, Bryan Martin
<bryanmmartinNOSPAM@xxxxxxxxxxx> wrote:

>See: http://encyclopedia.laborlawtalk.com/Jet_engine
>
>According to this article, modern turbine engines may achieve compression
>ratios of as high as 44:1 at very high altitudes (very cold intake air). But
>the compression ratio of a turbine engine can't be compared directly with
>the compression ratio of piston engines due to the differences between
>cyclic combustion and continuous combustion, among other things. He may have
>been referring to fuel/air ratios with the 14:1 and 70:1 numbers, but they
>still don't sound quite right.
>
>In any case, just because gasoline is burned at a certain F/A ratio and
>compression ratio in a piston engine has nothing to do with how you would
>burn it in a turbine. Piston engines operate at near stoiciometric mixtures:
>nearly all the oxygen and all the fuel react with each other leaving very
>little of either in the exhaust. This can not be done in a turbine. No
>matter what fuel is used it would result in melt-down of the hot section of
>the engine. Most of the air passing through a turbine engine is used to keep
>it cool. Only a small portion of the available oxygen is used to burn the
>fuel. Theoretically, just about any fluid fuel could be used in a turbine as
>long as you can produce a combustible mixture in the core of the combustor
>and pump enough excess air through it keep it cool. You could probably burn
>powdered solid fuels in a turbine if you could manage to feed a steady
>stream of it to in the combustors and get it to mix properly.
>
>Hmmm, a coal burning jet engine?

Or flour?
.

Relevant Pages

  • Re: Gasoline grade BTUs per gallon?
    ... They have much higher compression ratios than ... The higher compression ratio is only one part of the efficiency advantage ... down on the intake stroke that a normal gasoline engine has, ...
    (sci.energy)
  • Re: Old car, new engine. Spanking...
    ... Hes probably got most of the extra power purely from daft compression ... IRL our Greek will get close to nothing on raising the compression ratio ... engine which in the escort Mk2 will be a blast to drive but it hasn't ...
    (uk.rec.cars.modifications)
  • Re: Sir Frank Whittle
    ... > Jet Engine Pioneer ... turbine with rotating compressors and turbines in 1903 which is 34 ... 1872 - Dr. F. Stolze designed the first true gas turbine engine. ...
    (rec.aviation.military)
  • Re: Chrysler Turbine Car
    ... Automotive gas turbines are a type of turboshaft engine specifically ... designed for the purpose of roadgoing automobile or truck propulsion. ... conditions automobiles and turbine aircraft occupy in our world today. ...
    (rec.autos.makers.chrysler)
  • Re: Ineresting new engine design
    ... The Scuderi Split-Cycle Engine changes the heart of the conventional engine ... combination of one compression cylinder and one power cylinder. ... the environment as well as the efficiency of the engine. ... With Rv the compression ratio and gamma the ratio of specific ...
    (uk.transport)
Loading