Question 102Gas Turbine - 1st Asst/Chief
70% to passIn the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by which of the following? Illustration GT-0020
AFrame vent bleed air.
B9th stage compressor air.
C13th stage compressor air.
D16th stage compressor air.
AI Explanation
The correct answer is C) 13th stage compressor air. In a marine gas turbine engine, the high-pressure (HP) turbine 2nd stage nozzle vanes are cooled by the 13th stage compressor air. This is because the 13th stage compressor air has a higher pressure and temperature compared to the lower stages, making it suitable for cooling the critical HP turbine components that experience high temperatures during engine operation. The other answer choices, such as frame vent bleed air (A) or air from the 9th (B) or 16th (D) stages, would not provide sufficient cooling for the HP turbine 2nd stage nozzle vanes.
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