GATE_AE_2027_MOCK_03_Q29 GATE 2027 Aerospace Engineering All-India Master Mock 03 (Flight Dynamics, Controls & Space Trajectories) MCQ · 1 Mark
Propulsion • Compressors and Turbines • Axial Flow Gas Turbines & Blade Cooling

Which blade cooling technique creates a protective thermal boundary layer of cool bleed air over the external surface of high-pressure turbine blades?

(A) Film cooling
(B) Convection cooling
(C) Impingement cooling
(D) Transpiration freezing
Answer Key:
A

Step-by-Step Verified Solution

### Solution: Film cooling injects compressor discharge air through small holes in the blade skin to form an insulating boundary layer against hot combustion gases. Correct: A.
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