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What is the purpose of supercritical airfoil?

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What is the purpose of supercritical airfoil?

(a) Reduce critical Mach number

(b) Increase drag divergence Mach number

(c) Reduce drag divergence Mach number

(d) Increase lift of the airfoil at supersonic speed

I got this question in unit test.

Origin of the question is The Supercritical Airfoil topic in section Subsonic Compressible Flow over Airfoils : Linear Theory, Linearized Supersonic Flow of Aerodynamics

1 Answer

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Correct choice is (b) Increase drag divergence Mach number

Explanation: The purpose of a supercritical airfoil to delay the drag divergence Mach number so that there is a delay in wave drag formation which begins at the transonic speed. It aims to increase the Mach number increment between the critical Mach number and drag divergence Mach number.

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