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Science & Technology
Question about airfoil (wing) – aerodynamics
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<blockquote data-quote="start at edge" data-source="post: 206059" data-attributes="member: 11971"><p>Thanks a lot for you reply, that was very kind of you.</p><p>Yes, up in the sky, whether you push an airplane or pull it, it makes almost no difference to the airflow above (and below) the wing, that is true. However, common sense and also the so far gathered information (as I am very interested in this subject) tell me that inside a wind tunnel things happen slightly different.</p><p>I would be happy to have access to a small scale wind tunnel, to do this testing myself … but I don’t.</p><p>A better way to make myself understood is to explain as simple as possible where I am heading, as an image of that would be too large to post here on the site, so here it goes:</p><p>If inside a (long) wind tunnel, I have more airfoil profiles placed one behind the other, would I have maximum sum of lift (all airfoils combined) if I place the air pressure device in front of all those or behind them (behind the last one) ??</p><p>Without an actual small scale site (tunnel), I can only assume that if the air is pulled from the back (end “B” in the previous images), the airflow would be “straightened” after passing each wing (as there are also disturbances and vortexes created once it leaves the wing surface) and forced to hit the next wing under the same angle it hit the previous one.</p><p>I think that an accurate result of this could be much easier obtained if actually testing, rather than doing calculations. That is why an actual tunnel (even a small sized one) would be the best choice.</p></blockquote><p></p>
[QUOTE="start at edge, post: 206059, member: 11971"] Thanks a lot for you reply, that was very kind of you. Yes, up in the sky, whether you push an airplane or pull it, it makes almost no difference to the airflow above (and below) the wing, that is true. However, common sense and also the so far gathered information (as I am very interested in this subject) tell me that inside a wind tunnel things happen slightly different. I would be happy to have access to a small scale wind tunnel, to do this testing myself … but I don’t. A better way to make myself understood is to explain as simple as possible where I am heading, as an image of that would be too large to post here on the site, so here it goes: If inside a (long) wind tunnel, I have more airfoil profiles placed one behind the other, would I have maximum sum of lift (all airfoils combined) if I place the air pressure device in front of all those or behind them (behind the last one) ?? Without an actual small scale site (tunnel), I can only assume that if the air is pulled from the back (end “B” in the previous images), the airflow would be “straightened” after passing each wing (as there are also disturbances and vortexes created once it leaves the wing surface) and forced to hit the next wing under the same angle it hit the previous one. I think that an accurate result of this could be much easier obtained if actually testing, rather than doing calculations. That is why an actual tunnel (even a small sized one) would be the best choice. [/QUOTE]
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Question about airfoil (wing) – aerodynamics
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