Vortex Generator Clairification
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From: MA
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From: Raleigh, NC
1) Vortex generators (VGs) were studied to... improve the aerodynamic
characteristics.
(2) Application of the VGs of the optimum shape... showed a 0.006
reduction in both the drag coefficient and lift coefficient.
(3) ...we could predict that VGs cause the pressure of the vehicle’s
entire rear surface to increase therefore decreasing
drag, also the velocity around the rear spoiler to
increase, and the lift to decrease.
^Hope that helps. That's why people say they are effective even without a spoiler. Since they help with the flow characteristics @ our back window they reduce the car's drag.
I'll say it again - i still like the looks of my car more without it
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From: BRATISLAVA (SLOVAKIA)
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I was in another thread and the knowledge, or lack there of just astounded me as to exactly what the purpouse or the idea of a vortex generator was, is and what it does.
I just want the community to know exactly what they are putting on their cars, and even though it looks good, it has a functional purpouse.
The triangle-shaped bumps generate vortices, which have the effect of creating turbulent air keeping air stuck to the car and helping the rear wing do its job better. The result is higher downforce at high speeds. As you all should know, traction is a great benefit. Canards, vortex generators and lips all look really cool, but not because they just look good, because they actually have a functional purpouse at high speeds. An Evo that is stuck to the road is a happy Evo! An Evo with a VG and no wing is just doing it for looks.
If anyone wants to discuss aerodynamics, lets do so and get the miscommunication out of the way on what some aero parts do for the Evo. It does not fly, but by god it almost does
I just want the community to know exactly what they are putting on their cars, and even though it looks good, it has a functional purpouse.
The triangle-shaped bumps generate vortices, which have the effect of creating turbulent air keeping air stuck to the car and helping the rear wing do its job better. The result is higher downforce at high speeds. As you all should know, traction is a great benefit. Canards, vortex generators and lips all look really cool, but not because they just look good, because they actually have a functional purpouse at high speeds. An Evo that is stuck to the road is a happy Evo! An Evo with a VG and no wing is just doing it for looks.
If anyone wants to discuss aerodynamics, lets do so and get the miscommunication out of the way on what some aero parts do for the Evo. It does not fly, but by god it almost does
BTW, its "purpose".
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From: MA
The function of the VG has nothing to do with the spoiler. With or without the spoiler, it does the same thing. Trying to say which set-up is greater is only your opinion. For your car, setting it up as Spoiler+VG could be the best. But for say a drag car, Wingless+VG could be the best. There is no this is better the that, its about figuring out which combination works best on your car for whatever you use it for.
BTW, its "purpose".
BTW, its "purpose".
from your sig
Last edited by EvoBroMA; Aug 21, 2008 at 03:00 PM.
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Of course that's just a theory, I don't believe anyone has tested it. But I would bet money that it could be proven to be fact.
And is that quote in your signature from that guy that left a message on a womans phone? That was a funny as hell.
And is that quote in your signature from that guy that left a message on a womans phone? That was a funny as hell.
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The best aerodynamic profile is a smooth transition from the roof to the rear glass, the Evo does not have this and because of that it has a low pressure zone behind the rear window. This is bad because it creates drag (imagine the area behind the window as a vacuum sucking air into the low pressure zone). The vortex generator helps by reducing the low pressure zone behind the window. An added benefit is smoothing of the airflow (increasing velocity) to the rear wing which in turn increases its pressure difference above and below the wing, creating more downforce. On a car like a Prius with a smooth transition from roof to hatch, VG's wouldn't help, and would probably hurt drag.
Dan
Dan
