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Which condition encourages boundary layer transition in subsonic airfoils?

A)Increased adverse pressure gradient forces
B)Increased laminar flow skin friction
C)Higher Reynolds number towards laminarisation
D)Reduced surface roughness exacerbating separation

💡 Explanation

Increased adverse pressure gradients cause the onset of turbulence by triggering flow separation. because the increased force opposes streamline momentum. This results in turbulent flow rather than increased laminar flow because turbulence delays separation under these conditions.

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