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f21_mud - Lecture F21 Mud Airfoils Overview(23 respondents...

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Lecture F21 Mud: Airfoils Overview (23 respondents) 1. Do the negative pressures that act in a forward direction provide thrust? (1 student) Actually, yes. On some parts of the airfoil the pressures push or pull back (drag), an on some they pull or push forward (thrust). For an inviscid flow around an airfoil of any shape, the fore and aft forces cancel exactly, giving a net zero drag. In a real airfoil there is always a net aft drag force. (“Fore” and “aft” here is along the V direction, not along the chord line). 2. What is an airfoil’s “polar”? (3 students) It’s a plot of c versus c d , with being a dummy parameter running along the curve. I’m not sure of the orgin of the word “polar” in this context. 3. What do we interpret from the C L vs C D graph? (1 student) I think I gave a number of examples in recitation and in the following lecture. You will probably get more practice with them next term.
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