Random Wind Tunnel and Smoke Pictures Thread

[freebeard]

Another aero-study would be to photo-shop a GM EV-1 roofline onto it. It has a similar counter-intuitive/too radical contour.

[kach22i]

Yea, some sort of design phase GM was going though at the time.

https://driventowrite.com/2015/01/08...mobile-aurora/

1989 Oldsmobile Tube Car: note the Kamm tail and recessed sills. The c-pillar looks weak though.

Apparently the wind tunnel is just now a photo studio prop as a background.

Photo of the Day: Pininfarina H2 Speed in the Wind Tunnel
By Andrew Elliott -
12th May 2016
Photo of the Day: Pininfarina H2 Speed in the Wind Tunnel - GTspirit

The H2 Speed was debuted at this year’s Geneva Motor Show and is the fastest hydrogen-powered car ever designed. According to Pininfarina, the car can reach a top speed of 186 mph.

The sprint from 0-60 mph takes just 3.4 seconds.

Powering the H2 are two electric motors along with a hydrogen fuel cell. It also has a regenerative braking system installed.

Sort of frustrating that there is no rear 3/4 view which would highlight it's aerodynamics. The rear is more important than the front because that's where the drag is, nothing up front except some pressure build-up.

A single rear view, seriously?

Yep, that's it, the one above.

EDIT:

I went to another site to get a better view.

http://www.autoexpress.co.uk/car-new...at-geneva-show


From this angle you can see that the rear end is a bit high, designed more for down force than low Cd. Other than that it looks fairly good.

EDIT-2
Actually, looks like all it needs is a longer tail. I like the way it looks now though.

2 Mar 2016
http://www.autoevolution.com/news/pi...or-105208.html

Aerodynamics was also a key factor in the development of the H2 Speed, .............

It'll also sound special, Pininfarina says - at least for an electric vehicle, that is - and it's apparently down to the compressor technology it uses, which should achieve an almost silent drive. The hydrogen power unit was developed by Swiss specialist GreenGT.

Pininfarina intends to build the car in a limited run, and expects to have no trouble finding customers for the H2 Speed.

[kach22i]

Aero — Superlite Cars

The Aero is powered by a Chevrolet LS3 engine supplied by Katech Performance; the specification includes a new engine fitted with a Dailey 3-stage dry sump, and other parts designed to make the powerplant last under racing conditions. .....................................

Best of all, the Aero is available now, only as a turnkey, ready-to-race car. One price, one package, no options - ready to race at $69,995!

I'd favor a good old fashion wind tunnel and smoke image myself.

Spaghetti.

Aero — Superlite Cars

[gumby79]

^^^why the luvers in the fronnt finders ?
My guss is pressure release or brake cooling.

[freebeard]

maybe they just luv louvres?

That's a very interesting body.



I don't get the orange/green/blue banding that rises vertically off the nose of the car. It appears to be in a too-small tunnel and it's choking off the flow. The CFD model is flawed?

[kach22i]

Originally Posted by gumby79

^^^why the luvers in the fronnt finders ?
My guss is pressure release or brake cooling.

My guess is marketing.

It seems terribly redundant to scallop the wheel openings, and vent the wells from the rear with that vertical slot and to also have louvers.

I mean, that's three different ways the front wheel wells are vented, did the first two ways fail and they resorted to the tried and true louvers?

Or did customers expect to see louvers like on everything else in that market and express disappointment?

Originally Posted by freebeard

I don't get the orange/green/blue banding that rises vertically off the nose of the car. It appears to be in a too-small tunnel and it's choking off the flow. The CFD model is flawed?

I have not been taught/trained to interpret these types of images and find them often suspect. Perhaps because I do not understand them, or they are often just wrong, who knows?

[kach22i]

https://gr8autotech.wordpress.com/20...-aerodynamics/

[botsapper]

BMW tricks and details;

- Active 'kidney' grill opens and closes as required for engine cooling and improved aero.
- Air curtain channeling and speeding up airstream to reduce turbulence around wheel well housings.
- Air breather reduces turbulence and breaks down swirls behind tires.
- Active rear spoiler activated at 110 km/h reduces rear drag, optimized rear traction and retracted at 70 km/h.
- Air blade (CUV) sharp edge extensions to reduce rear pillar wakes.
- Aero wheel design optimized 'turbine blade' design reduce aero disruption around the wheel wells.

https://www.youtube.com/watch?v=z-B-Km5ahwQ

[Vman455]

Originally Posted by kach22i

My guess is marketing.

It seems terribly redundant to scallop the wheel openings, and vent the wells from the rear with that vertical slot and to also have louvers.

I mean, that's three different ways the front wheel wells are vented, did the first two ways fail and they resorted to the tried and true louvers?

Or did customers expect to see louvers like on everything else in that market and express disappointment?

The two fastest LMP1 cars for the past few years, the Audi R18...


...and Porsche 919...


...and Toyota's new LMP1 car, the TS050...


...vent the wheels at the top and rear as well. And I suspect they wouldn't do that unless there was some benefit.

[kach22i]

Originally Posted by Vman455

...vent the wheels at the top and rear as well. And I suspect they wouldn't do that unless there was some benefit.

The more front wheel venting, the better - I guess.

If you have the time, check out the evolution of this Indy race car from the 1960's. I specifically like the image of taking a hacksaw to it. Long story short, started out being enclosed wheel wells, then vented, then a bit open at the top, and then really open at the top. They hacked it up good in the end, but it just kept on getting faster all the while.

No Hot-Linking at this site - sorry:

Dave MacDonald runs Mickey Thompson's Ford powered 83 car in the 1964 Indy 500