How do you predict and prevent lean blowout in gas turbine combustors?

Lean blowout (LBO) occurs when equivalence ratio becomes too low to sustain combustion, typically below 0.4-0.5 depending on conditions. Prediction methods: Damkohler number correlations (ratio of residence time to chemical time), Loading parameter correlations from empirical data, Detailed chemical kinetics (flamelet, PSR reactor networks), and LES with finite-rate chemistry for dynamic prediction. Prevention strategies: Staged combustion (pilot zone stays richer), Improved atomization for rapid mixing, Flame stabilization through swirl and bluff bodies, Real-time equivalence ratio monitoring, and Control laws maintaining minimum fuel flow. Testing validates models across altitude, temperature, and transient conditions. LBO margin critical for flame stability at idle and high altitude.