Talk:Hypersonic wind tunnel

	Engineering portal This article is within the scope of WikiProject Engineering, a collaborative effort to improve the coverage of engineering on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.EngineeringWikipedia:WikiProject EngineeringTemplate:WikiProject EngineeringEngineering articles
???	This article has not yet received a rating on the project's importance scale.

‹See TfM›

Physics: Fluid Dynamics Mid‑importance

	Physics portal This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics articles
Mid	This article has been rated as Mid-importance on the project's importance scale.
	This article is supported by Fluid Dynamics Taskforce.

This article has a few spelling errors and some awkward grammar. E. Sn0 =31337= 13:00, 9 March 2006 (UTC)[reply]

Why didn't you edit it then instead of just adding a tag?Richyard 14:25, 13 September 2006 (UTC)[reply]

I fixed a spelling error and removed the tag. Gfloner 07:25, 18 February 2007 (UTC)[reply]

Pressure required 3GPa ?

It is stated "Simulations of a flow at 5.5 km/s, 45 km altitude would require tunnel temperatures of as much as 9000 K, and a pressure of 3 GPa.". I think that a pressure of 3 GPa (30 000 atmospheres!!!) is far too high, instead 3 MPa is more realistic (see further sections of the article). Also some quick calculations (adiabatic expansion) show that 9000K and 3MPa is more feasible. Any experts around? Regards NickFr (talk) 20:34, 30 December 2007 (UTC)[reply]

Considering the base of the Stratopause from International_Standard_Atmosphere, we have T=270.65K, p = 110.91Pa. Here, a = 329.71, hence M=16.68. Looking at a compressible flow table[1], at M=16.68, we have T/T0 = 0.1765e-1, p/p0 = 0.7311e-6, giving reservoir conditions of T=15300K, p = 151MPa assuming not heating of the flow. Assuming the flow is only heated in the subsonic region, at M=1, we have T/T0 = 0.8333, p/p0 = 0.5283, giving conditions immediately at the nozzle throat as T=12800K, p = 79.8MPa. The practicality of heating the flow in the supersonic region is not known. Additionally, the above all assumes that the working fluid is a perfect gas, which is a poor assumption at substantially elevated temperatures. — Preceding unsigned comment added by 88.97.163.220 (talk) 15:40, 12 August 2011 (UTC)[reply]

The high total pressure required, 3GPa, is required because of the need to reproduce the binary scaling parameter and Reynolds number in the wind tunnel. The binary scaling parameter is the product of density and length scale. This parameter arises from the the desire to reproduce the binary (two-body) dissociation reactions that are typically encountered in hypervelocity flight ^[1]. 3GPa may seem like an unreasonable total pressure, but reflected-shock tunnels and expansion tunnels are capable (or nearly capable) of these pressure because they are impulse, or ultra short test duration facilities. — Preceding unsigned comment added by 68.192.183.239 (talk) 18:31, 8 February 2014 (UTC)[reply]

References

^ http://www.annualreviews.org/doi/abs/10.1146/annurev.fl.21.010189.000345

External links modified (January 2018)

Hello fellow Wikipedians,

I have just modified one external link on Hypersonic wind tunnel. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://web.archive.org/web/20040822141011/http://www.vki.ac.be/facilities/pdf/longshot.pdf to http://www.vki.ac.be/facilities/pdf/longshot.pdf

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 01:28, 24 January 2018 (UTC)[reply]

[1] ttp://www.annualreviews.org/doi/abs/10.1146/annurev.fl.21.010189.000345

[1]