Adiabatic Flame Temperature

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A combustion process without heat loss or gain is adiabatic. The adiabatic flame temperature of some common fuel gases like hydrogen, methane, propane and octane with oxygen or air as oxidizers are indicated in the table below:

• reactants enter the combustion process at 25^oC (77^oF) and 1 atm pressure
• products leaves the process at 1 atm pressure
• combustion is stoichiometric without any excess air

Excess air will reduce the adiabatic flame temperature and is often introduced to avoid flame temperatures exceeding limits sets by the materials in the combustion system.

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