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Is viscosity effects the pitching moments?

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+1 vote
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in Aerodynamics by (773k points)
Is viscosity effects the pitching moments?

(a) True

(b) False

The question was posed to me during an online exam.

I'm obligated to ask this question of Viscous Flow in chapter Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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by (720k points)
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Best answer
The correct choice is (a) True

The best I can explain: Viscosity also affects the pitching moments of an airfoil. The pitching moment coefficient of an airfoil about chord point, potential flow theory states that this coefficient about this point is zero. In reality, a nose down pitching moment develops at a high angle of attack as the lift distributed over the nose part of the airfoil decrease due to viscous effects.

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