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Select the unmatched pair.

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in Aerodynamics by (773k points)
Select the unmatched pair.

(a) Pressure distribution: lift

(b) Shear stress: skin-friction drag

(c) Flow separation: form drag

(d) Air pressure: pressure drag

This question was posed to me by my college professor while I was bunking the class.

This key question is from Viscous Flow in chapter Incompressible Flow over Airfoils of Aerodynamics

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Right option is (d) Air pressure: pressure drag

The explanation: Lift is caused by the pressure distribution on the airfoil. The two ways drag is exerted is due to shear stress on the surface of the airfoil (skin – friction drag) and due to the flow separation (form drag, also called pressure drag).

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