The GATE Grind

GATE 2026 AE – Question 20

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 fundamental purpose of the Kutta condition in the thin airfoil theory is ________.

  1. to determine the total strength of the source distribution
  2. to determine the speed of the uniform flow
  3. to incorporate the essential effect of viscosity in the potential flow theory
  4. to incorporate the concept of induced drag in the inviscid theory

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (C) to incorporate the essential effect of viscosity in the potential flow theory

Explanation

Potential flow alone allows any circulation. The Kutta condition (smooth flow leaving the sharp trailing edge) fixes the circulation, and it is the way in which the effect of viscosity enters the inviscid theory.