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Speedy (Mechanical) (OP)
13 Jun 05 3:51
Hi Folks,

I am looking for a good source (ideally a handbook reference) of information on the combustion properties of both methane and hydrogen in oxygen at different pressures pre-ignition (up to 40 bar).
This is basic stuff I know but when I work through calculations I find I am making assumptions about ideal gases etc.

I did the basics years ago in college, but it has been a while.

Thanks in Advance,
Speedy
j2bprometheus (Mechanical)
1 Jul 05 11:12
Hi-
     Not quite certain what combustion properties that you want, but here is some info:

     An on-line calculator for heat of combustion of a natural gas type fuels ( with hydrogen)  at  http://www.processassociates.com/process/property/hc_gas.htm

    You can use the heat of combustion to make a good estimate of the adiabatic flame temperature.

   The exact calculation of adiabatic flame temperature requires iteration.  You know the enthalpy of the reactants.  Then make an initial guess at the flame temperature, calculate the enthapy of the equilibrium products at that temperature, and see if the enthapy of the products matches the enthalpy of the reactants.   If it does not match, you change the estimated flame temperature and try again.

     There is some computer code in FORTRAN called FARG and ECP that could be used to calculate the flame temperature.   They originally came from a book on IC engines by Colin Ferguson.  They are definitely set up to handle gasoline and diesel fuel.   It would not take much to change them to handle the hydrogen/methane mixture.
    
     

j2bprometheus@aol.com
bonzoboy (Chemical)
19 Nov 05 18:41
There's an equilibrium program on the web called Gas-Eq that will give you the properties of any mix you supply.  I use it quite often for calculating flame temperatures and thermal properties.

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