Voltex EVO in wind tunnel
I though Bernoulli's principle has to do with the increase or decrease of the speed of fluid being directly represented by pressure applied to that fluid. The greater the pressure applied the slower the fluid flows.
Last edited by ch53avitech; Mar 4, 2008 at 06:45 PM. Reason: grammar
a great deal of the flow follows the contour of the rear window. that is the area where the evo suffers. (the wing is catching cleaner air that has not been seduced by the roof line. The stock wing is a little low and a lot of its air is turbulent wash from the roof/rear window. greater airspeed brings some cleaner air to the wing.)
you see the pencil thin smoke line become very large, almost cloud like once it passes the roof line. basically it is a cloud formation area, once the air passes the roof it now has to expand to fill the new area over the trunk. it will need to bring more air in from where ever it can to fill the void. even to the point of pulling air from behind the car.
yarn was the original airstream indicator. don't know if the green line is something developed or just green yarn.
since the wing is an inverted airfoil there is lift pulling down. the air is traveling faster across the bottom surface... assuming air is "attached" to both surfaces and has not let go. while the wing is in the turbulent shadow of the rear window/ roofline very little air follows the airstream of the wing. when air speed has gotten to the point it deflects down more than breaks up is when the wing becomes useful. you can think of the roof line as an airfoil too. it is lifting, in the wrong direction.
you see the pencil thin smoke line become very large, almost cloud like once it passes the roof line. basically it is a cloud formation area, once the air passes the roof it now has to expand to fill the new area over the trunk. it will need to bring more air in from where ever it can to fill the void. even to the point of pulling air from behind the car.
yarn was the original airstream indicator. don't know if the green line is something developed or just green yarn.
since the wing is an inverted airfoil there is lift pulling down. the air is traveling faster across the bottom surface... assuming air is "attached" to both surfaces and has not let go. while the wing is in the turbulent shadow of the rear window/ roofline very little air follows the airstream of the wing. when air speed has gotten to the point it deflects down more than breaks up is when the wing becomes useful. you can think of the roof line as an airfoil too. it is lifting, in the wrong direction.
Already answered, I know, but I'll answer it again in a slightly different way, for anyone who still doesn't get it:
Where the air is moving faster (under the wing) there is less pressure than the force of air above the wing. So it pushes down as the wind moves under it faster and faster which decreases the pressure more and more. Same thing with airplanes only it is reversed. The air over the wing flows faster than under. So the goal is to get lots of really fast air to move under the wing, and as little as possible of air to move over the top.
Where the air is moving faster (under the wing) there is less pressure than the force of air above the wing. So it pushes down as the wind moves under it faster and faster which decreases the pressure more and more. Same thing with airplanes only it is reversed. The air over the wing flows faster than under. So the goal is to get lots of really fast air to move under the wing, and as little as possible of air to move over the top.
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