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Old   May 15, 2003, 14:10
Default A different view
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Consider the "visuals" of the following:

1/ "Standard" wind tunnel wing c/w streamlines. - At low AoA the air is leaving the trailing edge at an angle of -say- 15 degrees below horizontal

2/ A helicopter rotor in the horizontal plane. - At low blade AoA the airflow is STRAIGHT DOWN

So why the difference?

In 1/ the air is moving over the stationary wing

In 2/ the wing is "cutting" through the stationary air

Why in "all" textbooks is option 1/ chosen? Maybe this was the "standard" and "only" option before CFD visuals.

Why not use CFD to promote the visuals of option 2 which in my opinion is the more "truthful" option since in the end lift is the reaction force to air being "forced" vertically downward by the "wing".
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Old   May 27, 2003, 15:11
Default Re: A different view
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OP again.

Support for this "view" can be found in this excellent paper BUT no CFD support to produce option 2/ views.
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