vortex ring


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vortex ring

[′vȯr‚teks ‚riŋ]
(fluid mechanics)
A line vortex in which the line of concentrated vorticity is a closed curve. Also known as collar vortex; ring vortex.
References in periodicals archive ?
The pilot considered he then entered a Vortex Ring situation and due to the low altitude was unable to recover before the helicopter landed heavily.
I had thought we had a flight-control malfunction; we still weren't recognizing the effects of vortex ring state.
Finally, the timing of entering IMC and the onset of the vortex ring state made the situation stressful.
The V-22 is much less susceptible to Vortex Ring State [than a helicopter]," Schultz said.
These guidelines are extremely conservative and do not reflect differences in aircraft characteristics, nor do they account for the actual mechanism leading to the vortex ring state.
The severe vortex ring state can be expected when reaching approximately 1,900 fpm at a horizontal speed of approximately 20 knots.
When a wing accelerates suddenly through a fluid (as a plane's wing does through air), two vortex rings form around it.
The scientists hit on an idea by watching a YouTube video of dolphins creating and manipulating vortex rings in a tank at an aquarium.
The structure of vortices and vortex rings in Bose-Einstein condensates (BECs) has been a subject of intense interest during the past few years and has been studied experimentally at JILA and theoretically in Gaithersburg.
Laboratory experiments, using cylindrical pipes in still water, showed that vortex rings provide efficient propulsion, so engineers presumed squid took advantage of them.
In addition, the visualization also discovered an unanticipated structure of concentric vortex rings, shown in Fig.