If wheels had fan like blades should they pull or push air?

[Big time]

If wheels had fan like blades should they pull air in the car wheelwells or push it out of the car?

I think for brake cooling they should push air out of the car.
Some racecars use ducts that route air out of the car.

For lower aero drag Would pulling air into the wheelwells reduce drag as it removes the boundary layer and turbulence outside the wheels?

[backpacker3]

I believe it would depend on the direction the wheels were rotating (e.g. Forward or reverse) and how the blades were setup. Think of a ceiling fan they usually have a switch that let's them rotate either clockwise or counter clockwise and therefore "push" or "pull" air

[kach22i]

I always thought that they pulled the air in but I could be mistaken.

File:Porsche 956 962 (935?) tires and wheels (7526211220).jpg
http://commons.wikimedia.org/wiki/Fi...526211220).jpg


Bump steer: BBS..............









Common to duct from under the car or opening in the front valance, and cool though a port in the backing plate on the backside.

http://www.patrickmotorsports.com/pr...e-911-rsr-38l/


http://www.paragon-products.com/Brak...-pbscbp78k.htm

[Frank Lee]

Tesla has or had fan blade wheels. They went in every direction.

[doviatt]

Originally Posted by kach22i

I always thought that they pulled the air in but I could be mistaken.

File:Porsche 956 962 (935?) tires and wheels (7526211220).jpg
File:Porsche 956 962 (935?) tires and wheels (7526211220).jpg - Wikimedia Commons


Bump steer: BBS..............

All of these seems to centrifugal fan design. The spinning would push air out/pull air from inside the wheel well.

[kach22i]

The below is a Copy & Paste of an old post of mine.

http://ecomodder.com/forum/showthrea...deo-27446.html
EDIT-1: Hummgh.........strange...
F1: Sandbagging, Strange Appendages and Other News | Fake News from the Scuderia Stables

It is still a matter of debate whether these strange wheel attachments are indeed an aero device, a measuring device, a satelite system, or a tv signal booster, perhaps only time will tell. Personally we were hoping for some spikes out the side to shred the oppositions tyres, but you know we can’t have it all and we are prone to getting carried away with things on the odd occasion.

Edit-2..................it's about brake cooling.
Wheel Shrouds

We witnessed significant rule change for 2010. The wheel shrouds have been banned after a couple of incidents last season where they came off at speed.

Originally Posted by ennored

I think you're all missing the basics. Relative to the ground (and air) the top of a wheel is traveling at twice the road speed. The bottom is not moving.

Fairing the top half will have MUCH higher gains than doing the bottom.

It would be interesting if the flow were straightened, just saying.

As it is now, I cannot even start to separate out the different forces and reach a conclusion.

[kach22i]

Originally Posted by doviatt

All of these seems to centrifugal fan design. The spinning would push air out/pull air from inside the wheel well.

I'd agree, but this single image below seems to be counter to that for some reason.

In this F1 design the air gets drawn in, not so sure about the Porsche.

http://fakeferrarinews.wordpress.com...nd-other-news/


Centrifugal fans can suck or blow, I guess we would have to know more about the specific design the original poster had in mind. He offered no images at all, could be on a wild goose chase again.

All I've done so far is completely confuse myself on the topic.

[elhigh]

The only way to make a wheel blow in would be to make its spoke into axial blades, which for our purposes would be burning a lot of power to move air that might not need to be moved. For that matter the centrifugal blower setups wouldn't help us either. If you're in the 24 Hours of LeMons, that might be another matter but for somebody trying to eke every inch out of every drop, not so much.

[backpacker3]

It can do both though it will depend on blade shape and which way the wheels are turning if you want it to suck air into the wheels or blow air out of them you could make either way work.

[kach22i]

Originally Posted by backpacker3

It can do both though it will depend on blade shape and which way the wheels are turning if you want it to suck air into the wheels or blow air out of them you could make either way work.

Assuming we want cooling while the car is moving forward, and we can make it either suck in or blow out, which is going to be best aerodynamically?

Post #1022 in the link below has some interesting tires which may be too much to include in this conversation at this point in time. However it may also provide a bigger view of the issues being faced.

http://ecomodder.com/forum/showthrea...11732-103.html