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venturi tunnels, diffusers and wings- question
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CarGuru > Formula-1 > venturi tunnels, diffusers and wings- question 7 June 2007 05:59:25
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venturi tunnels, diffusers and wings- question

Patrick Mitchel 7 March 2005 15:22:42
 Of the 3, which of these downforce devices is least affected by turbulence
from a car in front of a car the devices would be mounted on? I seem to
recall that when venturi tunnels were used, they worked independently of the
affects of a leading car, but that they were affected by ride height and
angle of attack( the were sensetive to porpoising). Diffusers work at the
butt end of things. Do they affect downforce of the car at the aft end
solely such that they must be balanced by forewings? Am beginning to think
that sucker cars all, would be preferable to all the aero contrivances that
reduce the ability to overtake going into or out of turns. Just curious
Pat


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Phil Newnham 7 March 2005 17:11:05 [ permanent link ]
 patrick mitchel wrote:> Of the 3, which of these downforce devices is least affected by turbulence> from a car in front of a car the devices would be mounted on? I seem to> recall that when venturi tunnels were used, they worked independently of the> affects of a leading car, but that they were affected by ride height and> angle of attack( the were sensetive to porpoising).

The venturis tend to "suck" the car onto the track, which can
dramatically reduce the gap between car and road, which reduces the
amount of air going under the car, shutting off the flow, which then
stagnates somewhat under the car, which means the venturi stops working,
and the car rises again.
Diffusers work at the> butt end of things. Do they affect downforce of the car at the aft end> solely such that they must be balanced by forewings?

Diffusers tend to produce downforce in the middle of the car, so they do
not need to be balanced by a front wing, generally. They are however
very effective devices, and they are said to generate a lot of the
swirling air that affects the next car - I still want to do some kind of
experiment to show this, or not, using CFD, but I don't currently have
access to the right software or the knowledge to do it - the grid would
have to be extremely complex to model at least 1.5 F1 cars.
Am beginning to think> that sucker cars all, would be preferable to all the aero contrivances that> reduce the ability to overtake going into or out of turns. Just curious

The cars seemed more able to follow closely before the introduction of
ground effect type aerodynamics, and even after, while it was not well
understood. It would appear that increasing diffuser efficiency has
reduced the ability of the next car to follow closely - of course, the
rear wings have also changed, but they have been simplified by strict
rules in more recent times to no apparent effect.

--

Phil
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Mzero8 7 June 2007 05:59:25 [ permanent link ]
 All devices close to ground are affected most by proximity to ground, i.e. ground clearance, so front wings are mostly quite low and some limits have been put on their position, to try to limit their effectiveness.
Also, front wings will suffer most from turbulence because they are wings, and as at front they are closest to source. And you can not control the turbulence off the car ahead except the closer you get the worse it gets.
Venturi tunnels work in a somewhat more controlled environment because the turbulence they are in is from the front bits of your own car, and you can perhaps control flow, clearances and rake.
Rear wings are most under your control because least affected by outside influences, and high up.
But hey, I'm more interested in enclosed-wheel aero, and would really appreciate help on that.
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CarGuru > Formula-1 > venturi tunnels, diffusers and wings- question 7 June 2007 05:59:25
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