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According to the reasoning given by Prandtl for his lifting line theory, finite wing is like a ________(a) Bound vortex(b) Horseshoe vortex(c) Free vortex(d) Trailing vortexThis question was posed to me in an interview.I want to ask this question from Prandtl’s Classical Lifting-Line Theory in portion Flow over Airfoils over Finite Wing of Aerodynamics

Answer»

Right answer is (a) Bound VORTEX

Explanation: PRANDTL reasoned that the finite wing can be thought LIKE a bound vortex, which is opposite to the free vortex. SINCE a vortex filament cannot end in the fluid, it is ASSUMED that there are two trailing vortices which gives the appearance like that of a horseshoe vortex.



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