Discussion
A vortex sheet is used in thin airfoil theory to represent
Answer: B
Correct answer: The camber line of the airfoil
Thin airfoil theory replaces the section by its mean camber line and distributes a sheet of vorticity along it, choosing the strength so that the camber line is a streamline and the Kutta condition is satisfied at the trailing edge. Because the model is inviscid it contains no boundary layer and no wake, which is precisely why it predicts lift accurately and drag not at all.
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