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Unformatted text preview: Lecture F2 Mud: Thin Airfoil Theory Symmetric Airfoil ( respondents) 1. How thin does the airfoil have to be for this to apply? (1 student) It depends what youre after. If you just want overall c and c m , TAT is remarkably accurate even for not-so-thin airfoils. For accurate detailed surface C p ( x ) distributions, the airfoil must be quite thin. In the PSs you will investigate this. 2. What do you mean by real ow and vortex-sheet model are equivalent? (1 student) They are equivalent when the model duplicates the velocity field V ( x, z ) of the real ow. 3. Whats , d . . . ? Same as vorticity? Whats x ? (5 students) is a location along the x-axis where the d-piece of the vortex sheet is. The sheet strength at that location is ( ), and the circulation around the piece is d = d . x is a different location, where the velocity w ( x ) is being computed. The difference x is just the distance between the sheet-piece location and the velocity-calculation...
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- Fall '05