Discussion
Which quantity is unaffected by a change in Reynolds number in inviscid theory?
Answer: B
Correct answer: The lift curve slope predicted by thin airfoil theory
Thin airfoil theory is inviscid, and Reynolds number is a ratio of inertial to viscous forces, so it cannot appear in the result - the theory gives a slope of \( 2\pi \) per radian regardless. The other three all depend on viscosity: transition, maximum lift, and skin friction are all boundary layer phenomena.
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