1.

For the case of infinite horseshoe vortices along the lifting line, a vortex sheet exists which_________(a) Is formed by continuous trailing vortices(b) Is perpendicular to free-stream velocity(c) Total strength is zero(d) Equal and opposite trailing vorticesI had been asked this question during an interview.This key question is from Prandtl’s Classical Lifting-Line Theory topic in section Flow over Airfoils over Finite Wing of Aerodynamics

Answer»

Correct answer is (b) Is perpendicular to free-stream velocity

Explanation: The continuous trailing VORTICES gives a vortex SHEET in the direction PARALLEL to the free-stream velocity. The total strength of the vortex sheet is ZERO since it CONSISTS of trailing vortices with equal and opposite strength.



Discussion

No Comment Found

Related InterviewSolutions