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wind tunnel models ?

wind tunnel models ?

RE: wind tunnel models ?

Ummm
Is is a photo from an experiment or is it a project from art class?
Is there value in coating wind tunnel models with fluorescent liquid (help visualize the flow)?



www.sparweb.ca

RE: wind tunnel models ?

This is more like what you expect to see.
Vents to represent the engine intakes, and suction in the support cone.
These are very small models, BTW. Probably less than a meter long (both this example and the "art" project above)

www.sparweb.ca

RE: wind tunnel models ?

Some car manufacturers are happy to quote Cd with the radiators blanked off. There is some method in the madness, as it is a lot easier to initially correlate models with complicated bits blanked off, and then add the complications.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: wind tunnel models ?

Incidentally there was a proprietary round robin of wind tunnel tests all over the world using a couple of standard vehicles. Rather hilariously the same wind tunnel used by two different but associated manufacturers gave different results.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: wind tunnel models ?

(OP)
SW,
the photo was from Flight. yes, your 2nd pic is more what I'd've expected.

I have some really need pix (somewhere!?) of the Eurofighter prototype in a water tunnel.

another day in paradise, or is paradise one day closer ?

RE: wind tunnel models ?

Quote (GregLocock)

same wind tunnel used by two different but associated manufacturers gave different results

Well, gee, yeah, Greg. Wind tunnels are so 20th century. That's why everyone's going to CFD models, now. Everyone can model the same thing and get exactly the same result, every time. glasses

www.sparweb.ca

RE: wind tunnel models ?

Sorry, perhaps I should have said /significantly/ different results, of the order of 10% for Cd. Lift at each axle was worse of course because it seems every tunnel has its own method of creating a moving floor. As for CFD well yes, but that goes for all complex sims.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

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