Flame Temperature Calculator

Flame Temperature Calculator: Real-World Flame Temperature With Excess Air

Real combustion systems almost always run with more air than the bare stoichiometric requirement, and that extra air absorbs heat without contributing any combustion energy, pulling the actual flame temperature well below the theoretical adiabatic value. This calculator applies that dilution effect to give a more realistic operating temperature.

The Formula

T_actual = T_ambient + (T_ad − T_ambient) / (1 + Excess Air% / 100)

Worked Example

The adiabatic flame temperature is 2,200°C, ambient temperature is 25°C, and the burner runs with 20% excess air.

T_actual = 25 + (2,200 − 25) / 1.20 = 1,837.5°C

How to Use This Calculator

1. Enter the adiabatic flame temperature (from the Adiabatic Flame Temperature Calculator if needed).
2. Enter the ambient or reference temperature.
3. Enter the excess air percentage the burner operates with.
4. Click Calculate to see the estimated actual flame temperature.

Related Calculations

Cross-reference with the Excess Air Calculator to determine your operating excess air level.