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.