Question 101Gas Turbine - 1st Asst/Chief
70% to passIn the marine gas turbine engine shown in the illustration, the HP turbine 1st stage nozzle vanes are cooled by which of the following? Illustration GT-0020
A8th stage compressor air.
B9th stage compressor air.
C13th stage compressor air.
D16th stage compressor air.
AI Explanation
The correct answer is D) 16th stage compressor air. In a marine gas turbine engine, the high-pressure (HP) turbine 1st stage nozzle vanes are typically cooled by the 16th stage compressor air. This air is extracted at a higher pressure and temperature, which is ideal for cooling the critical nozzle vanes that experience the highest temperatures in the turbine section. The other options, A, B, and C, would not provide sufficient cooling capacity for the HP turbine 1st stage nozzle vanes, as the compressor air from lower stages would not be at a high enough pressure and temperature to effectively cool these components.
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