Answered: At subsonic speeds, how do the lift…

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At subsonic speeds, how do the lift coefficient CL and drag coefficientCD for a wing vary with angle of attack α?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.68P

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Question

At subsonic speeds, how do the lift coefficient C_L and drag coefficient
C_D for a wing vary with angle of attack α?

Expert Solution

Step 1

When the angle of attack increases, the flow separation on the upper surface of the wing becomes more pronounced, and that causes a reduction in the rate of increase in the wing's lift coefficient. Therefore, the lift coefficient reaches to a maximum and then decreases when the angle of attack is increased further. The angle of attack for which the lift coefficient is maximum is known as the critical angle of attack or the stall angle of attack.

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