The secondary passages on the gas turbine...

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Question 1 of 205eccef9fbacbc34ba4d46b4b

The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? Illustration GT-0005

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5eccef9fbacbc34ba4d46b4b

The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? Illustration GT-0005

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🔍 Key Concepts

• Primary vs secondary fuel passages in dual-orifice gas turbine fuel nozzles • The role of the spring-loaded valve (at A) that opens the secondary circuit • Typical fuel pressure range for ignition vs full-power operation in small marine gas turbines

💭 Think About

• Look at the component marked A in the illustration: what has to happen, pressure-wise, for that piston/spring assembly to move and uncover the secondary ports? • At light-off and low power, do you want a low or high fuel pressure at the nozzle to maintain good atomization without over-fueling? Then, think about how much higher the pressure must be before you would safely open the secondary passages. • Compare the four pressure choices: which are clearly too low to overcome a substantial spring force, and which seem more consistent with a ‘high power’ or ‘secondary flow’ condition?

✅ Before You Answer

• Identify on the drawing where the primary flow path is and where the secondary path begins to open. • Mentally separate starting/idle fuel pressure from high-power fuel pressure and match the secondary opening to the latter. • Before choosing, eliminate any options that would make the secondary passage open almost immediately at start, since that would defeat the purpose of having a staged (primary/secondary) nozzle.

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Question 1 of 205eccef9fbacbc34ba4d46b4b

The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? Illustration GT-0005

Back

Question 1 of 20

5eccef9fbacbc34ba4d46b4b

The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? Illustration GT-0005

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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