This application will calculate and plot the flame temperature of octane for a varying amount of air. Temperature-dependent thermodynamic properties are calculated with the ThermophysicalData:-Chemicals package.

For lean combustion (i.e. 100% or more stoichiometric air), the combustion reaction is

C₈H₁₈ + 12.5 Y/100 (O₂ + 3.76 N₂) ? 8 CO₂ + 9 H₂O + (Y/100-1) O₂ + 47 Y / 100 N₂
For rich combustion (i.e. less than 100% stoichiometric air), the combustion reaction is (assuming that the combustion products contain CO₂, H₂O, CO and N₂)

C₈H₁₈ + 12.5 Y/100 (O₂ + 3.76 N₂) ? (25Y - 1700)/100 CO₂ + 9 H₂O + (2500 - 25Y)/100 CO + 47 Y /100 N₂