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← ScienceWhich risk dramatically increases due to shear-layer turbulence within a scramjet combustor?
A)Unstable combustion and flameout✓
B)Reduced nozzle divergence efficiency
C)Increased skin friction drag
D)Compressor stall and flow reversal
💡 Explanation
Unstable combustion and flameout occurs because **turbulent mixing** enhances fuel and air mixing variability, potentially leading to local extinction events. This rapidly fluctuates the energy release, therefore combustion becomes erratic and flameout risk increases rather than improved predictable conditions.
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