In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for __________. Illustration GT-0017

Correct Answer: Option A — high pressure turbine 2nd stage nozzle cooling

Thirteenth-stage compressor bleed air is directed to the high-pressure turbine second-stage nozzle vanes. This cooling air is essential for managing the intense heat of the combustion gases, preventing nozzle vane distortion or melting, and ensuring the aerodynamic profile remains consistent for efficient energy extraction within the turbine section.