🔍 Key Concepts

• Atomization pressure needed for proper fuel nozzle spray in marine gas turbines • Relationship between manifold pressure and overcoming spring-loaded valves and air pressure at the nozzle tip • Typical pressure range for fine cone spray versus dribbling or poor atomization

💭 Think About

• Look at the illustration and think about what pressure is needed to open the internal valve and still leave enough pressure to finely atomize the fuel at the tip. • Compare each pressure range with what you know about diesel engine injection pressures versus gas turbine fuel nozzle pressures—are gas turbines usually lower, similar, or higher? • Which of these ranges would most likely prevent dribbling and ensure a clean, stable spray pattern for ignition and combustion in a high‑airflow combustor?

✅ Before You Answer

• Be sure the chosen range is high enough to fully open the nozzle valve shown in the illustration against its spring. • Confirm that the pressure is sufficient for fine atomization, not just for fuel flow. • Eliminate any range that seems more typical of low‑pressure transfer/service systems rather than atomizing nozzles.