🔍 Key Concepts

• Fuel nozzle design in gas turbine engines • How primary combustion air is introduced and mixed • Role of a swirl / shroud in atomizing and stabilizing the flame

💭 Think About

• Think about what must happen to the fuel and air just as they enter the combustor for efficient burning. What does swirling or shrouding the flow help accomplish? • Would cooling the nozzle tip be the main job of a swirl cup, or a side effect of how air flows around it? • In an LM2500, what is more critical at the nozzle: temperature control of metal, or proper fuel–air preparation before ignition?

✅ Before You Answer

• Verify how the swirl cup (air shroud) directs air around the fuel spray pattern. • Check whether the shroud acts directly on fuel, air, or both before combustion. • Confirm from your gas turbine notes whether tip cooling is a specifically stated function of the air shroud, or just a possible secondary benefit.