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Originally Posted by MrInstrument
On a car however, Z strips are all but useless because cars are not designed with laminar flow in mind but flow more so related to the old cumbersome wings you see on 30 plus year old airplanes.
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Even 1mm or 1/24" high dimple tape works on the front of a car.
(mirrors, top of the windscreen, A-pillar)
Empirical testing by myself showed they reduced wind noise and altered the wind / rain pattern on the side windows.
It's likely not enough to improve fuel consumption beyond the daily variation, but they DO have an effect.
No effect observed @ rear of vehicle.
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we can now take this energy imparting device and strategically place it to "create" the boat tail the adds to aerodynamic efficiency.
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That's the holy grail of VG placement.
Can you prove it ?
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In contrast, VG's are not hard mods but merely imparting controlled energy into the air.
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They're easy mods by themselves, but hard to make efficient ... hard to control.
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Therefore if we are generating energy from the air,
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You're not creating any energy with VGs.
They are COSTING energy.
The only way to make 'm work is applying them in such a way that the vortices result in an overall improvement, despite the drag they or the induced vortices cause themselves.
That'd require a lot of trial and error experimentation for most, or lots of wind tunnel research by the happy few with access to one.
As a result, adding VGs won't be a
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quick, inexpensive flow control, with $$$ benefits, VG's are the way to go.
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Why do I expect you to pop up and start advertising some miraculous VGs
