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What is the flow outside the airfoil?(a) Irrotational(b) Rotational(c) Circumferential(d) ConstantI have been asked this question by my college director while I was bunking the class.The query is from The Kutta-Joukowski Theorem topic in chapter Inviscid & Incompressible Flow of Aerodynamics

Answer»

Correct answer is (a) Irrotational

Easiest EXPLANATION: The flow outside the airfoil is irrotational and the circulation around any CLOSED curve not ENCLOSING airfoil is consequently zero. When the boundary layer separates, its displacement THICKNESS increases sharply, which modifies the outside potential flow and pressure field.



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