In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by __________. Illustration GT-0020

Correct Answer: Option B — 13th stage compressor air

The second-stage nozzle vanes of the high-pressure turbine require significant cooling due to their exposure to high-velocity, high-temperature gas. Thirteenth-stage compressor air is bled from the compressor discharge area and channeled through the nozzle assembly to provide necessary convective and film cooling.