In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for which of the following? Illustration GT-0017

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

The 13th stage bleed air provides the higher pressure required to effectively cool the high-pressure turbine 2nd stage nozzle vanes. This air overcomes the internal gas path pressure, ensuring a continuous flow of cooling air through the vane passages to prevent thermal degradation of the turbine nozzle assembly.