Discussion
A separation bubble on an airfoil is a region where the flow
Answer: A
Correct answer: Separates and then reattaches further downstream
A laminar boundary layer can separate under an adverse gradient, become turbulent in the free shear layer above the surface, and then reattach because the now turbulent layer carries more momentum. The enclosed region is the separation bubble. Short bubbles are largely benign, but a bubble that bursts and fails to reattach produces an abrupt leading edge stall.
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