How is the adiabatic Flame Temperature for a constant volume system estimated { eg. Otto Cycle Analysis (idealization of the process in a gasoline engine)} compared to a Constant Pressure System { gas turbine, furnace }?

Adiabatic Flame Temperature is determined by using the first law of thermodynamics in an adiabatic situation.

For a Constant Pressure System :

Change in Enthalpy = Q = 0

For a Constant Volume System :

Change in Internal Energy = Q = 0

Change in Internal Energy = Change in Enthalpy - V (P(initial) - P(adiabatic))

The evaluation is done by trial and error and depends on the calculation of mean specific heat of a species at a particular temperature. The attached Fortran and PPT outlines the detail.

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