wind tunnel models ?

[rb1957]

this, from Flight International, surprised me. It's a model of the latest UK fighter, Tempest. Appears to show the engine intakes as being blocked off, rather than allowing airflow into the engines ?



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[Sparweb]

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)?

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[Sparweb]

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)

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[GregLocock]

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


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[GregLocock]

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


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[rb1957]

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 ?

 

[Sparweb]

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.

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[GregLocock]

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


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