Question 60Gas Turbine - Assistant Engineer

The correct answer is C) Compressed air entering the root and exiting the tip. The turbine blades in high-pressure (HP) turbines are typically cooled using compressed air from the compressor section of the engine. This compressed air enters the root (base) of the turbine blade and then flows through internal cooling passages within the blade, eventually exiting at the tip of the blade. This method of cooling helps to maintain the structural integrity and lifespan of the turbine blades, which are exposed to extremely high temperatures during engine operation. The other answer choices are incorrect because they do not accurately describe the typical cooling method used for HP turbine blades. Option A is incorrect as the air flow is in the opposite direction. Options B and D are incorrect as they describe a cooling water system, which is not the common cooling method for HP turbine blades.