IntermediateTopic 40 of 105Thermodynamics & Fluids
Adiabatic flame temperature
The temperature reached by combustion without heat loss.
In depth
The temperature products reach if all heat of reaction raises their temperature with no heat loss or work. Found by energy balance H_reactants=H_products. Peaks near stoichiometric mixture; excess air lowers it. Limits burner and turbine design (NOx forms above ~1800 K).
Key points
- About 2200 K for methane in air
- Dissociation lowers actual values
- Material limits
ExampleGas turbines dilute combustion with excess air to protect blades.
What is Adiabatic flame temperature?
The temperature reached by combustion without heat loss.
Why is it important to understand adiabatic flame temperature?
The adiabatic flame temperature is the upper limit on temperature from a combustion process, which affects material choices and emissions.
Why is the adiabatic flame temperature important?
It gives the theoretical maximum temperature of combustion products, which sets the limits of furnace and engine design.
What reduces the actual flame temperature?
Heat losses, dissociation of products at high temperature and incomplete combustion all lower the real temperature below the ideal value.
How is Adiabatic flame temperature used in practice?
Typical applications include estimating the maximum temperature in a furnace burning methane, checking the flame temperature of a fuel for a high-temperature process and explaining why nitrogen oxides increase at higher flame temperatures.
What should I learn before Adiabatic flame temperature?
Study "Combustion" first (topic 39 of 105 in Thermodynamics & Fluids). It covers the groundwork this topic builds on.
What are the key points of Adiabatic flame temperature?
About 2200 K for methane in air. Dissociation lowers actual values. Material limits.
Can you give an example of Adiabatic flame temperature?
Gas turbines dilute combustion with excess air to protect blades.
What comes after Adiabatic flame temperature?
The next topic is "Internal combustion engine performance", which builds directly on this one.
How difficult is Adiabatic flame temperature?
It is classed as Intermediate in Thermodynamics & Fluids (topic 40 of 105). It is an intermediate topic. Work through the beginner topics in Thermodynamics & Fluids first.