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Ok, so there is a low pressure field above the wing,
and the wing is pressed up from underneath. So, just out of curiosity, what happens to the air that was in the low pressure field above the wing - after the wing passes? Does it just magically co back to it's old ways (and places)? And the air that was in the high pressure field under the wing? After the wing passes, is it unaffected as well? |
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cavelamb wrote:
Ok, so there is a low pressure field above the wing, and the wing is pressed up from underneath. So, just out of curiosity, what happens to the air that was in the low pressure field above the wing - after the wing passes? Does it just magically co back to it's old ways (and places)? And the air that was in the high pressure field under the wing? After the wing passes, is it unaffected as well? It's all a slowly descending smoke ring. If the earth was "the only thing that finally stops it" as Alan says, none of the ring's energy would be lost as it pushes through the surrounding air to reach the earth. http://www.av8n.com/how/htm/airfoils.html#sec-circulation-vortices Figure 3.27 ties the wingtip vortices in with the rest of the circulation pattern, showing the whole smoke ring in red. Also look up at section Section 3.11, http://www.av8n.com/how/htm/airfoils.html#sec-spinners Add the Fluttering Card circulation, Figure 3.25, to familiar tip vortices, and you get the whole ring. Other articles do a nice job explaining tip vortices or downwash behind the wing as isolated subjects, but that's where they end their stories. |
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Beryl wrote:
cavelamb wrote: Ok, so there is a low pressure field above the wing, and the wing is pressed up from underneath. So, just out of curiosity, what happens to the air that was in the low pressure field above the wing - after the wing passes? Does it just magically co back to it's old ways (and places)? And the air that was in the high pressure field under the wing? After the wing passes, is it unaffected as well? It's all a slowly descending smoke ring. If the earth was "the only thing that finally stops it" as Alan says, none of the ring's energy would be lost as it pushes through the surrounding air to reach the earth. http://www.av8n.com/how/htm/airfoils.html#sec-circulation-vortices Figure 3.27 ties the wingtip vortices in with the rest of the circulation pattern, showing the whole smoke ring in red. Also look up at section Section 3.11, http://www.av8n.com/how/htm/airfoils.html#sec-spinners Add the Fluttering Card circulation, Figure 3.25, to familiar tip vortices, and you get the whole ring. Other articles do a nice job explaining tip vortices or downwash behind the wing as isolated subjects, but that's where they end their stories. I've seen the results first hand. Flying along just above a smooth cloud surface at high subsonic, the "wake" behind the leader makes a shallow trough in the cloud, then the edges swirl back up into the tip vortices. The high pressure air underneath rebounds up, and the low pressure field above the wing rebounds back down. Net result = zero. |
#4
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In article ,
cavelamb wrote: Beryl wrote: cavelamb wrote: Ok, so there is a low pressure field above the wing, and the wing is pressed up from underneath. So, just out of curiosity, what happens to the air that was in the low pressure field above the wing - after the wing passes? Does it just magically co back to it's old ways (and places)? And the air that was in the high pressure field under the wing? After the wing passes, is it unaffected as well? It's all a slowly descending smoke ring. If the earth was "the only thing that finally stops it" as Alan says, none of the ring's energy would be lost as it pushes through the surrounding air to reach the earth. http://www.av8n.com/how/htm/airfoils.html#sec-circulation-vortices Figure 3.27 ties the wingtip vortices in with the rest of the circulation pattern, showing the whole smoke ring in red. Also look up at section Section 3.11, http://www.av8n.com/how/htm/airfoils.html#sec-spinners Add the Fluttering Card circulation, Figure 3.25, to familiar tip vortices, and you get the whole ring. Other articles do a nice job explaining tip vortices or downwash behind the wing as isolated subjects, but that's where they end their stories. I've seen the results first hand. Flying along just above a smooth cloud surface at high subsonic, the "wake" behind the leader makes a shallow trough in the cloud, then the edges swirl back up into the tip vortices. The high pressure air underneath rebounds up, and the low pressure field above the wing rebounds back down. Net result = zero. Sorry, but wrong. -- Alan Baker Vancouver, British Columbia http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg |
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