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Old 10-06-2011, 09:15 AM   #11
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Excellent information. The VG's reduce drag by delaying flow seperation. It also looks like they increase the effectiveness of the rear wing by increasing airflow velocity undearneath the bottom surface.

Now we just need a paper from FHI on the vane spoiler on the STi :D
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Old 10-06-2011, 10:47 AM   #12
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My layman's understanding is that these work similarly to the way the dimples in a golf ball work. That is, they create turbulence. Turbulent airflow is less desirable than laminar airflow, all things being equal, however turbulent airflow tends to "stick" to a surface better and prevent separation, so it's viewed as the lesser of two evils. Separated airflow means you're carrying around a pocket of air that makes the apparent size of your object (a vehicle in this case) larger, increasing your coefficient of drag and making downstream airflow devices (e.g. wings) less effective.
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Old 10-06-2011, 10:51 AM   #13
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Because racecar!!! That's all you need to know.
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Old 10-06-2011, 11:17 AM   #14
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My layman's understanding is that these work similarly to the way the dimples in a golf ball work. That is, they create turbulence. Turbulent airflow is less desirable than laminar airflow, all things being equal, however turbulent airflow tends to "stick" to a surface better and prevent separation, so it's viewed as the lesser of two evils. Separated airflow means you're carrying around a pocket of air that makes the apparent size of your object (a vehicle in this case) larger, increasing your coefficient of drag and making downstream airflow devices (e.g. wings) less effective.
Uh, no, way off in this case. They generate vortices (hence the name), which delay flow seperation from the body of the vehicle. Flow seperation is bad, especially when you have a big wing that you would like to have providing downforce on your rally car.

In the paper, you read from the findings that the generators reduce drag and increase downforce, by delaying flow seperation, and increasing the velocity profile over the wing. The CFD profile plot on page 5 really says it all.

The VG's were sized specifically for this unique application (evo 8) and are most effective with the rear wing.
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Old 10-06-2011, 01:00 PM   #15
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It's just an old airline Boeing training course joke!
I should have known lol.

If anything it would create AC lol
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Old 10-06-2011, 02:10 PM   #16
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Found a vortex generator on a Kia Forte Koup today. Things freakin' clean. I lurve it...apart from the vortex generators...

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Old 10-06-2011, 03:09 PM   #17
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^those were added by the owner.
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Old 10-06-2011, 03:37 PM   #18
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^those were added by the owner.
Yes? And?
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Old 10-06-2011, 03:42 PM   #19
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And it makes them lame, but I believe you already stated you liked the car MINUS the stick on doodads.
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Old 10-06-2011, 04:31 PM   #20
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Oh god, please tell me Pep Boys isn't selling those things in chrome with 3M tape application. I'm afraid to even look online...

EDIT: too late, I caved into my curiosity. Link.
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