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How the circulation around the airfoil?

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+1 vote
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in Aerodynamics by (773k points)
How the circulation around the airfoil?

(a) Positive

(b) Negative

(c) Constant

(d) Slightly varies

This question was addressed to me in an online quiz.

The question is from Kelvin’s Circulation Theorem and the Starting Vortex topic in portion Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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Best answer
Right choice is (b) Negative

Easy explanation: A positive circulation round an airfoil, this implies that there must be negative circulation round the airfoil. This has been observed experimentally. The vortex shedding continues until the circulation round the airfoil is sufficient to make the main irrotational flow smooth at the trailing edge.

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