The GATE Grind

GATE 2023 AE – Question 18

Aerodynamics · Airfoils and wings: coefficients, Kutta-Joukowski theorem, thin airfoil theory, finite wing theory, critical and drag divergence Mach numbers · 1 mark · Multiple choice

The figures shown in the options are schematics of airfoil shapes (not to scale). For a civilian transport aircraft designed for a cruise Mach number of 0.8, which among them is aerodynamically best suited as a wing section?

source diagram and its labels are reproduced in the attached image.
  1. Option A in the figure
  2. Option B in the figure
  3. Option C in the figure
  4. Option D in the figure

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Show answer and explanation

Correct answer: (D) Option D in the figure

Explanation

The flattened upper surface and aft camber of the supercritical section in D delay shock formation and drag rise near Mach 0.8.