Question 26Gas Turbine - Assistant Engineer

The correct answer is C) By a continuous flow of compressor discharge air. The HP (high-pressure) turbine rotor of the GE LM2500 gas turbine is cooled by a continuous flow of compressor discharge air. This air is bled from the compressor section and directed to the HP turbine section to provide cooling for the turbine blades and other critical components. This cooling method helps maintain the structural integrity and performance of the HP turbine under the high temperatures and stresses it experiences during operation. The other answer choices are incorrect because: A) The lube oil system does not directly cool the HP turbine rotor. B) The ship's seawater cooling system is not used to cool the HP turbine. D) An air-to-air heat exchanger is not the primary cooling method for the HP turbine rotor.