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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 you’re 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 PS’s you will investigate this. 2. What do you mean by “real ﬂow and vortex-sheet model are equivalent”? (1 student) They are equivalent when the model duplicates the velocity field π V ( x, z ) of the real ﬂow. 3. What’s , d . . . ? Same as vorticity? What’s 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 α ( ), and the circulation around the piece is d = α 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
- Airfoil, symmetric airfoil, vortex sheet