For the GE LM2500 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 D — High pressure turbine 2nd stage nozzle cooling.

The 13th stage compressor bleed air on the GE LM2500 is utilized for high-pressure turbine cooling. Specifically, it is directed to the 2nd stage nozzle vanes to maintain material temperature limits, preventing thermal degradation and creep during the high-energy combustion process inherent in the Brayton cycle.