Question

Which of the following is incorrect for a finite wing?

(a) Streamlines on the top surface bend towards the root

(b) Span-wise flow at the bottom surface is towards the tip

(c) Higher pressure region exists at the top surface

(d) Streamlines on the bottom surface bend towards the tip

I got this question by my college professor while I was bunking the class.

This key question is from Downwash and Induced Drag topic in portion Flow over Airfoils over Finite Wing of Aerodynamics

Answer 1

Correct choice is (c) Higher pressure region exists at the top surface

For explanation: There is higher pressure region at the bottom and lower pressure at the top. Due to which the flow moves from the wing root at the bottom towards the wing-tips, turns upwards and moves towards the wing root at the top surface. Thus, streamlines on the bottom surface bend towards the tip and vice versa happens at the top surface.