This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||
|
This article is written in American English, which has its own spelling conventions (color, defense, traveled) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus. |
will try to create a simple diagram soon. this is a pretty hard physical construction to describe verbally. mnemonic 22:52, 2004 Jul 15 (UTC)
Added a link which includes some graphs showing where a helicopter will enter vortex ring state. I didn't check copyright status, but maybe someone else can see if maybe they ca plot similar graphs or so from scratch at least?
Kim Bruning 12:19, 25 Jun 2005 (UTC)
Hi Guys,
I've tried to add a more general intro to vortex rings and have put the helo-effect as a subheading. I also tried to intuitively explain how the ring may form, but I need some one in the know to check it.
thanks Kghose 15:02, 20 October 2005 (UTC)
Hi,
While looking into flight test data on an early VTOL aircraft Short SC.1, I came across a research memorandum which refers to the losses in vertical thrust due to what is referred to there as "ground effect". This seemed fine, since this is how I would have described it, so I added the appropriate link to the article. Looking at ground effect however, I discovered that this refers to a net gain in lift experienced by some conventional aircraft wing types when flying close to the ground.
There is a potential confusion here, which I would like to sort out.
Is "vortex ring" specific to rotary wing aircraft?
Is "vortex ring" perhaps the U.S. term, "ground effect" the British term for the same thing?
Here is the reference: Discussion of ground effect w.r.t. the Short SC.1
Thanks TraceyR 19:55, 12 January 2007 (UTC)
Hello Tracey R. The article which you read may have been referring not necessarily to ground effect but of hot gas re-ingestion into the engine. As VTOL aircraft hover close to the ground, hot exhaust gases may be 'sucked' back into the engine intakes which would increase the temperature of the intake air and reduce thrust. Ground effect is an increase in lift that is experienced when an aircraft flies close to the ground, if I recall correctly (been a while since I've flown), within about the distance of a wing span. Oversimplifying the phenomenon, the air underneath the aircraft becomes a 'cushion' that the aircraft rests on increase the net lift. Vortex ring state is as has been described in the article and as far as I know is limited to rotary wing aircraft and is definitely not the same as ground effect or hot gas re-ingestion. Cheers, Angmi —Preceding signed but undated comment was added at 04:37, 20 September 2007 (UTC) Article cited on the SC.1 does not appear to discuss effects of hot gas re-ingestion.-- Angmi ( talk) 10:23, 13 April 2008 (UTC)
I think that the page Vortex ring toys provides redundant information, and a new section in Vortex ring would better suit the proper formatting of wikipedia. Thusly, I have added merger templates to the start of both pages. What do y'all think? Mmoople ( talk) 22:32, 21 March 2009 (UTC)
I cannot find any reference to Shafranov regarding the similarity of steady Euler flow to the MHD equations, but I did find a reference in a footnote in Saffman (Vortex Dynamics) to a 1986 paper, H.K. Moffatt, "On the existence of localized rotational disturbances which propagate without change of structure in an inviscid fluid", J. Fluid Mech. 173, 289-302. Since Hill's spherical vortex is a very specific vortex ring, and its relation to MHD tenuous (without a reference), it seems like this is a trivial inclusion, and should probably be axed. Markstock ( talk) 00:59, 18 October 2010 (UTC)
Lord Kelvin says that:
Unfortunately it's not clear to me whether he's talking about two conserved quantities, (length divided by angular velocity; and length times cross-sectional area; implying a third that's angular velocity times cross-sectional area) or one, angular velocity times cross-sectional area divided by length. Documenting the conserved quantities of a vortex line would be a good addition to this page. There must also be some relationship between the conserved quantities and the properties of the fluid: pressure, temperature, density and perhaps specific heat capacity. Documenting any such relationships would also be constructive. 84.215.6.188 ( talk) 14:08, 14 February 2011 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Vortex ring. 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:
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).
Cheers.— InternetArchiveBot ( Report bug) 02:48, 22 May 2017 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Vortex ring. 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:
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).
Cheers.— InternetArchiveBot ( Report bug) 22:39, 22 January 2018 (UTC)