Question 42Gas Turbine - 1st Asst/Chief

The correct answer is D) By a continuous flow of compressor discharge air. The HP turbine rotor of the GE LM2500 gas turbine engine is cooled by a continuous flow of compressor discharge air. This is a common cooling method for high-pressure turbine components in gas turbine engines. The compressor discharge air is channeled through internal passages within the turbine rotor to absorb heat and prevent the rotor from overheating during operation. The other options are incorrect because: A) The ship's service seawater cooling system is typically used for other engine components, not the HP turbine rotor. B) Synthetic lube oil is used for lubrication, not cooling of the turbine rotor. C) An air-to-air heat exchanger is not the primary cooling method for the HP turbine rotor in this engine design.