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Wind Tunnel question

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Monstrobolaxa
Monstrobolaxa
1
Joined: 28 Dec 2002, 23:36
Location: Covilhã, Portugal (and sometimes in Évora)

Post

There is a windtunnel facility that can reach Mach 9 for under 30 seconds.... (not completly sure if it was 7 or 9 the mach number)

To confirm the number if anyone has the book "Introduction to Flight" Anderson.....I think I read it in there.
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Monstrobolaxa
Monstrobolaxa
1
Joined: 28 Dec 2002, 23:36
Location: Covilhã, Portugal (and sometimes in Évora)

Post

There is a windtunnel facility that can reach Mach 9 for under 30 seconds.... (not completly sure if it was 7 or 9 the mach number)

To confirm the number if anyone has the book "Introduction to Flight" Anderson.....I think I read it in there.
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Monstrobolaxa
Monstrobolaxa
1
Joined: 28 Dec 2002, 23:36
Location: Covilhã, Portugal (and sometimes in Évora)

Post

http://facilities.grc.nasa.gov/1x1/

Here is a link for a mach 6 wind tunnel at nasa....still looking for the mach 9 one....at my university we only have a mach 1 :(
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CFDruss
CFDruss
0
Joined: 08 Sep 2003, 18:47
Location: Tamworth (nr Birmingham) UK

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maybe so.........thats not a task beyond our technological field. However, you try reaching these speed at full scale analysis, and are these tunnel climatic controled!!!!
CFD is by far the best bet for sure calculations.

Wouldnt mind having a go in a hypersonic vehicle either when they get developed....haha. Im sure I will be long gone by then though!!! :(
Russell Harrison
Forced Convection Design Engineer, Comair Rotron Europe Ltd
CFD is based around assumptions; the accuracy of the solution depends not only on the knowledge of the mathematics behind the software but the assumptions the user makes!!!
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Monstrobolaxa
Monstrobolaxa
1
Joined: 28 Dec 2002, 23:36
Location: Covilhã, Portugal (and sometimes in Évora)

Post

Well just wondering can CFD do a hyersonic study?

I'm still into CATIA....I'll be going to CFD in October/November....but we could try doing something in the hypersonic region if the CFD can do it... :wink:
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CFDruss
CFDruss
0
Joined: 08 Sep 2003, 18:47
Location: Tamworth (nr Birmingham) UK

Post

as im aware (may be incorrect) CFD is not quite capable of hypersonic flow regimes, however, I believe that developers are close to moderatly accurate solution. CFD has a better chance of hypersonic flow than windtunnel!!!! Shame really, would be quite a feeling to stand in a hypersonic tunnel!!! hehe......wonder what would happen to you!!!! :shock: :shock: :shock:
Russell Harrison
Forced Convection Design Engineer, Comair Rotron Europe Ltd
CFD is based around assumptions; the accuracy of the solution depends not only on the knowledge of the mathematics behind the software but the assumptions the user makes!!!
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asphodel
asphodel
0

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The fastest wind tunnel I am aware of is at the University of Queensland where they specialise in Hypersonics. Check out http://www.mech.uq.edu.au/hyper/.
I think they get to Mach 10 but it will only last 1 millisecond. At that speeds, Commerical CFD using Navier-Stokes isnt that useful so they use their own codes.
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StiK
StiK
0
Joined: 31 May 2004, 20:43
Location: Portugal

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Well it seems that the hypersonic regime studies are going to have a hard time. First: the current wind tunnel facilities aren't good enough for detailed testing and they are very expensive to operate and second: how do you validate the CFD code without enough data from wind tunnel !?
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dumrick
dumrick
0
Joined: 19 Jan 2004, 13:36
Location: Portugal

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StiK wrote:how do you validate the CFD code without enough data from wind tunnel !?
Yeah, that's what I was thinking. :)
Are the readings obtained til now in prototype crafts enough to create a model??? :?
How the hell could anyone make CFD studies for those conditions? :shock:
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