Turbine Block 13 Practice Exam

A weak fuel-to-air mixture along with normal airflow through a turbine engine may result in which condition?

A lean blowout A lean die-out A rich surge Fuel starvation

Correct Answer:

A lean die-out

Explanation:

In this scenario the key idea is flame stability with respect to the fuel–air ratio. If the mixture is too lean—too little fuel for the amount of air—the flame may not have enough energy to sustain combustion. With normal airflow, there isn’t an excess of air to blow the flame out, but there isn’t enough fuel to keep it burning either. The result is the flame extinguishing, which is known as lean die-out. Lean blowout, by contrast, usually involves conditions where air flow is so high or the flame is driven toward the extreme lean end that the flame is physically blown out. Fuel starvation would mean there isn’t fuel reaching the combustor at all, not merely that the ratio is too lean.

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