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About 4,418 papers for “Vortex ring”
Zaremba, Matouš · Brno University of Technology Digital Library (Brno University of Technology) · 2011
Cílem práce je navrhnout zařízení na tvorbu vírových prstenců. V práci se zabývám konstrukčním řešením zařízení, výrobou a experimentálním ověřením funkčnosti pomocí několik experimentů s vírovými kroužky. V práci je zahrnuta také teoretická část, která matematicky popisuje pohyb vírového prstence.
Cited by 0Open access
Dongqing Li Prof. · 2008
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Matouš Zaremba · Digital Repository (National Repository of Grey Literature) · 2011
The aim is to design equipment for the production of a vortex ring. The work deals with design of equipment, manufacturing and experimental verification of the functionality of some experiments with vortex rings. The work also includes a theoretical part which mathematically describes the motion of the vortex ring.
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Matouš Zaremba · Digital Repository (National Repository of Grey Literature) · 2011
The aim is to design equipment for the production of a vortex ring. The work deals with design of equipment, manufacturing and experimental verification of the functionality of some experiments with vortex rings. The work also includes a theoretical part which mathematically describes the motion of the vortex ring.
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2014
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Hitoshi Ishikawa, Seiichiro Izawa, Osamu MOCHIZUKI et al. · TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B · 2002
Numerical simulations of the interaction between the vortex ring and the vortex tube was performed, with the aim of control of tumbulent mixing layer. The vortex tube is the simple model of the rolling-up vortices in the mixing layer. The simulation was made by the three-dimensional vortex blob method. The ratio of circulation of vortex tube to vortex ring ΓR/ΓF was varied in the range of 0.5-2.0. If ΓR/ΓF=0.5 the vortex was stretched and involved into the vortex tube. If ΓR/ΓF=1.0 the cut and reconnection occurred between a part of the vortex ring and a part of the vortex tube. But if ΓR/ΓF exceeds about 1.5 the vortex ring was found to pass through the vortex tube. The initial position of the vortex ring has significant effects on the interaction. A portion in the vortex ring whose circulation is the same sign as the vortex tube, combined with the vortex tube to generate the large vortex. On the other hand, another portion in the vortex ring of the opposite sign generate a new vortex pair.
Cited by 5Open access
P. V. E. McClintock · Lancaster EPrints (Lancaster University) · 1972
The experimcnt of Gamota and Barmatz (Phys. Rev. Lett. 22, 874; 1969) did not, as had been supposed, measure the impulse of a beam of quantized vortex rings, according to a recent paper by Huggins (Phys. Rev. Lett. 29, 1067; 1972).
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V. (Václav) Tesař · ASEP · 2012
Paper discusses an almost unknown and yet interesting operating principle of fluidic nomoving-part devices for flow control. The principle is based on the properties of vortex rings. A standing vortex ring is kept in a semi-toroidal recession positioned opposite to an annular nozzle from whichissues an annular fluid jet. The ring can exist in the recession with two alternative senses of rotation so that the annular jet is led to either the central exit through the centre of the vortex, or to the outer spacepast the outer vortex circumference.
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Yifei Yu, Chaoqun Liu · Synthesis lectures on engineering, science, and technology · 2024
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Václav Tesa · 2012
Paper discusses an almost unknown and yet interesting operating principle of fluidic no- moving-part devices for flow control. The principle is based on the properties of vortex rings. A standing vortex ring is kept in a semi-toroidal recession positioned opposite to an annular nozzle from which issues an annular fluid jet. The ring can exist in the recession with two alternative senses of rotation so that the annular jet is led to either the central exit through the centre of the vortex, or to the outer space past the outer vortex circumference.
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Philippe Chatelain, Demosthenes Kivotides, Anthony Leonard · arXiv (Cornell University) · 2002
We investigate numerically the Navier-Stokes dynamics of reconnecting vortex rings at small $Re$ number. We find that reconnections are dissipative due to the smoothing of vorticity gradients at reconnection kinks and to the formation of secondary structures of stretched anti-parallel vorticity which transfer kinetic energy to small scales where it is subsequently dissipated efficiently. In addition, the relaxation of the reconnection kinks excites Kelvin waves which due to strong damping are of low wavenumber and affect directly only large scale properties of the flow.
Cited by 0Open access
George K. Lucey, Louis E. Jasper · 1998
Abstract : The U.S. Marine Corps Joint Nonlethal Weapons Directorate tasked the U.S. Army to demonstrate a means of quickly converting the Navy MK19-3 automatic 40-mm grenade launcher between lethal and nonlethal modes of operation. The Army Research Laboratory (ARL) teamed with the Armament Research and Development Engineering Center (ARDEC) to demonstrate a kit for retrofitting to the weapons already stockpiled by all services. The kit enables the weapon to apply flash, concussion, vortex ring impacts, marker dyes, and malodorous pulses onto a target at frequencies approaching the resonance of human body parts. Two goals are to provide a demonstration to the U.S. Army Training and Doctrine Command in 1998 and to transition from technology base research to PM Small Arms development in 2000. This paper describes the concepts proposed for nonlethal crowd control, gaps in technology that inhibit fielding, and proposed approaches to resolution. Organizations in government, industry, or academe with common interests and active vortex ring programs are encouraged to coordinate with ARL to share resources and avoid duplication of effort.
Cited by 4
Danaila, Ionut, Kaplanski, F., Sazhin, Sergei · University of Brighton Repository (University of Brighton) · 2021
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Ionut Danaila, F. Kaplanski, С.С. Сажин · Mathematical engineering · 2021
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CASCIOLA, Carlo Massimo, PIVA, Renzo · IRIS Research product catalog (Sapienza University of Rome) · 1993
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Nguyen, VanLuc · Figshare · 2025
Figures showing the oblique collision between a vortex ring and a vortex tube.
Cited by 0Open access
Ionut Danaila, F. Kaplanski, С.С. Сажин · Mathematical engineering · 2021
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Dipendra Gupta (18990614), Sanjay P. Sane (7244381), Jaywant H. Arakeri (5841758) · Figshare · 2024
<p>The input signal to the DAQ (top) is a trapezoidal wave with voltage amplitude V, rising time t1, constant duration t2-t1 and fall time t3-t2-t1. This signal is converted into analog form, amplified and fed to the speaker for vortex ring generation. Fog particles were injected into nozzle through fog injection port (FIP), and a high speed camera was placed horizontal to record the lateral view of the vortex ring as it propagates. In experiments with flies, we used two high-speed cameras to capture the 3D trajectories for the flies. All dimensions are in cm.</p>
Cited by 0Open access
Mammetti, Marco · OpenGrey (Institut de l'Information Scientifique et Technique) · 1999
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Nguyen, VanLuc · Figshare · 2025
Figures showing the oblique collision between a vortex ring and a vortex tube.
Cited by 0Open access