🔍 Key Concepts

• Gas turbine engine (GTE) fuel nozzle design and purpose • What fluids actually pass through or around a fuel nozzle in a marine gas turbine • How primary vs. secondary fuel flow are used during different engine power ranges

💭 Think About

• Think about what the fuel nozzle is directly responsible for delivering into the combustion chamber. Which flows must it precisely control? • Consider how gas turbine combustion chambers are cooled. Is that cooling normally routed through the fuel nozzle passages or by some other path? • Ask yourself which of these flows would be most likely to cause complexity, leakage risk, or unnecessary weight if routed inside a small nozzle body.

✅ Before You Answer

• Verify which fluids typically pass through a marine gas turbine fuel nozzle: fuel and/or air • Recall whether cooling air, not water, is commonly used for turbine/compressor/combustor cooling • Confirm that primary and secondary fuel circuits can both be integrated into the same nozzle assembly for different power settings