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If Air Pressure Had A Choice...  
User currently offlineLehpron From United States of America, joined Jul 2001, 7028 posts, RR: 21
Posted (12 years 9 months 2 weeks 2 days 12 hours ago) and read 1116 times:

This is a question dealing with the aerodynamics of an aerofoil relating induced drag, overall lift, vortices and the purpose there of.

*For certain subsonic and/or supersonic aerofoils, where would the secondary flow, i.e. vortices, occur?

*What would be the shortest path that the flow would go?

Any comments are greatly appreciated. Thank you for your time.

Lehpron



The meaning of life is curiosity; we were put on this planet to explore opportunities.
4 replies: All unread, jump to last
 
User currently offlineLehpron From United States of America, joined Jul 2001, 7028 posts, RR: 21
Reply 1, posted (12 years 9 months 2 weeks 2 days 1 hour ago) and read 1051 times:

Is it really that hard?


The meaning of life is curiosity; we were put on this planet to explore opportunities.
User currently offlineMinuteman From United States of America, joined Aug 2000, 271 posts, RR: 0
Reply 2, posted (12 years 9 months 2 weeks 1 day 3 hours ago) and read 1031 times:

It's really that incomprehensible.

What are you talking about? To which certain airfoils are you referring?

In general, bound vorticies are going to be perpendicular to the lifting-line of an airfoil. This dives into 3D Potential flow. It involves lots of ugly math that ends up being only an approximation anyway.

If you're into that kind of thing, here ya go:
http://www.desktopaero.com/appliedaero/





User currently offlineLehpron From United States of America, joined Jul 2001, 7028 posts, RR: 21
Reply 3, posted (12 years 9 months 2 weeks 1 day ago) and read 1018 times:

I see it as a simple question, any approximation will do as long as it's accurate.

I mean any aerofoil; except for supercritical wings, they all perform similarly in their envelopes. So which way does the air go?

I asks vaguely because I came up with an innovation a few weeks ago that can deal with voticies better than winglets.






The meaning of life is curiosity; we were put on this planet to explore opportunities.
User currently offlineTAA_Airbus From Australia, joined Nov 1999, 726 posts, RR: 0
Reply 4, posted (12 years 9 months 1 week 5 days 23 hours ago) and read 992 times:

basically any aerofoil will produce vortices.

The main way a common vortex is produced is higher pressure air underneith the aerofoil pushing it self out from under the wingtip and then tries to roll up to the low pressure on top of the aerofoil. This is what initiates the spiralling vortex.

The idea of the winglet is to try stop the air forcing its way up and therefore disturbing the spiralling air which is being formed.

Other ways in which vortices are minimized are tip tanks, on light aircraft (eg. Cessna 310) or a blended wing, also on some light aircraft.

I hope thats what you were asking, like minuteman said, the question wasnt very well asked!


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