How is the HP turbine rotor of the LM2500 GTE cooled?

Correct Answer: Option D — By a continuous flow of compressor discharge air

Compressor discharge air is utilized for cooling the high-pressure turbine rotor because it provides a continuous, high-pressure flow capable of overcoming internal gas path pressures. This air effectively removes heat from the turbine disks and blades, maintaining structural integrity under extreme thermal loads inherent in LM2500 gas turbine operations.