What is the function of diluent air in lean-burn combustors and how does it affect NOx formation?

• A. Diluent air lowers flame temperature, reduces NOx formation, and stabilizes combustion
• B. Diluent air increases flame temperature, increases NOx
• C. Diluent air has no effect on NOx
• D. Diluent air cools turbine components independently of combustion

Answer: (A)