The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an GE LM2500 gas turbine engine is which of the following?

Correct Answer: Option D — all of the above

The air shroud, or swirl cup, serves multiple critical functions in the combustion chamber. It provides cooling air to the nozzle tip to prevent thermal degradation, induces turbulence to improve atomization, and ensures optimal air-fuel mixing for efficient, stable combustion within the GE LM2500's annular combustor design.