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Engineering
General Engineering
Airfoil Explained for 16-Year-Old Confused By It
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[QUOTE="boneh3ad, post: 5469605, member: 268837"] All of that air in the vicinity of an airfoil gets bent downward (in the case of positive lift, anyway). For the air on the bottom, you can (sort of) imagine it like the air is hitting the bottom and being deflected downward, though this is only partially true, as it doesn't take into account the influence of the upper half (as mentioned in the article with the skipping stone fallacy). Still, it may be useful to visualize. For the top, consider that if the air flew over the top of an airfoil with positive angle of attack and did not bend downward, there would be a void created. This void would be at zero pressure, while the free stream is at some higher pressure, so it would tend to push the air flow back down against the wing. In reality that void never forms in the first place and the air "simply" bends down to follow the contour of the surface. Those are the simplistic, half-truth answers that ought to help with visualizing what is actually occurring. The truth is, though, that the flow over and under the wing affect each other. They are one system where changes to one will affect changes to the other. In other words, you can't [I]really[/I] treat the upper and lower regions separately like I just did any get the correct answer, but it ought to help with qualitatively understanding what is going on. [/QUOTE]
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Airfoil Explained for 16-Year-Old Confused By It
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