question_answer

An aerofoil shaped plane wing is being tested in an wind tunnel.

Choose the most appropriate depiction of pressure over aerofoil

A)

B)

C)

D)

Correct Answer: D

Solution :

As air passes around plane wing,

Due to shape of aerofoil, velocity of air layers over above surface of wing is more than lower surface of wing.

As, \[\frac{1}{2}\rho {{v}^{2}}+p=\text{constant}\]

When v velocity increases, pressure will fall. So, a pressure difference acts on lower surface of wing causing lift of plane.