Random Wind Tunnel and Smoke Pictures Thread

[kach22i]

1987 Oldsmobile Aerotech - Concepts



Car Wind Tunnel Data

[kach22i]

Bugatti EB110: Rise & Fall of a Supercar | Sometimes Interesting

A model of an early Bugatti EB110 prototype is prepared for wind tunnel testing. (courtesy the Bugatti Registry)

[gumby79]

Originally Posted by kach22i

VWVortex.com - Rear roof spoiler - has anyone seen any of these?


Photobucket

Do you think that properly placed VG's would bring the separation point down closer to the bumper?

[kach22i]

Originally Posted by gumby79

Do you think that properly placed VG's would bring the separation point down closer to the bumper?

I assume we are talking the top image - yellow VW Beetle/Bug, right?

I have no idea, I'm on the fence about those things but if they work on aircraft the principal has got to be sound, right?

I guess testing is the only thing we can believe in and I don't see a lot of actual tests published, as in wind tunnel and smoke images.

Seeing is believing.

EDIT: I did find this....................

BMW tests delta / strake style roof mounted vortex generators
http://ecomodder.com/forum/showthrea...rtex-8936.html

https://www.youtube.com/watch?v=fsfKATW73g4

https://forums.nasioc.com/forums/sho...039947&page=19


A comment in that thread above by Crazy_pilot........I agree with him but the U of M video of the Ford Taurus scale model may have the answer we are looking for.

I would really like to see a car driven with a fully tufted rear windshield to see the airflow with and without VGs attached. The theory is sound, but I don't know if it's being applied correctly in most of these aftermarket parts.

[freebeard]

Originally Posted by gumby79

Do you think that properly placed VG's would bring the separation point down closer to the bumper?

Vortex Generators are too much of a kludge. Their action is too localized to move things that far.

Powered solutions could do that — Coanda nozzles or plasma actuators.

[kach22i]

Originally Posted by freebeard

Vortex Generators......action is too localized to move things that far..........

Aft airflow even one inch closer to the rear bumper would be an improvement.

I don't think gumby79 meant all the way down to the rear bumper.

Anyway, the images I posted show tuff attachment on rear windows at similar angles with VG use. Something to ponder.

I wonder if attempts to get aft airflow down to bumper height will meet resistance due to ground pressure wave interference and also from the air flowing under the car/truck.

I'll stick to focusing on getting air to rear spoiler for now, few things bug me more than things attached to the car that do nothing because they don't engage the air flow.

On the VW Bug/Beetle turbo the rear spoiler below the window helps fill out the profile to fit the Aero-Template fairly well I suspect - a good thing.

[freebeard]

"Closer to"... "even an inch"...

I guess I took it too literally. A Coanda nozzle could blow the wake directly onto the bumper.

[kach22i]

I see that you posted that image at least once before, a few other images from that thread.

What to learn (if anything) from wind tunnel smoke lines images?
http://ecomodder.com/forum/showthrea...nes-27660.html




And another thread where it was used, just for future reference.

http://ecomodder.com/forum/showthrea...a-25351-3.html

[freebeard]

I think the Volkhart-Sagitta will always be my favorite VW. 90mph on 25hp.



How do you find the previous postings? Site search? I actually pulled them out of an album.

[kach22i]

Originally Posted by freebeard

How do you find the previous postings? Site search?.......

I got lucky using a Google image search where that little camera icon is, and used your hotlink address with a Copy & Paste.

The first two results were ecomodder links.

The Volkhart-Sagitta is awesome if you like efficiency, and most of us in the forum like efficiency.

https://engineered.thyssenkrupp.com/...e-wind-tunnel/