The vortex ring impinging onto a flat plate (vertical cross section and the velocity field)

Taiichi Nagata, Shinnosuke Obi, Shigeaki Masuda

Research output: Contribution to journalArticle

Abstract

As a part of the laboratory experiment on an isolated microburst, the instantaneous velocity fields of an impulse-driven vortex ring impinging onto a normal wall were investigated. Vortex rings were visualized by filling ethylene glycol smoke. In this paper, as the sequel of the previous paper (Nagata et al., 2000), by employing PIV, the vertical cross-section of the velocity fields was reported. It was shown that the central downward flow as well as the entrainment above the vortex ring agrees qualitatively with numerical simulation of atmospheric microburst (Proctor, 1984). The roles of vortex ring in the velocity field of microburst was discussed. The time evolution of the total circulation in vertical cross section could be fitted to the theoretical equation for that of incompressible viscous vortex.

Original languageEnglish
Pages (from-to)733-739
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number667
Publication statusPublished - 2002 Mar
Externally publishedYes

Fingerprint

vortex rings
flat plates
Vortex flow
velocity distribution
cross sections
smoke
entrainment
particle image velocimetry
impulses
glycols
Ethylene glycol
ethylene
Smoke
vortices
Computer simulation
simulation
Experiments

Keywords

  • Digital image processing
  • Flow visualization
  • Microburst
  • PIV
  • Velocity distribution
  • Vortex ring

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "As a part of the laboratory experiment on an isolated microburst, the instantaneous velocity fields of an impulse-driven vortex ring impinging onto a normal wall were investigated. Vortex rings were visualized by filling ethylene glycol smoke. In this paper, as the sequel of the previous paper (Nagata et al., 2000), by employing PIV, the vertical cross-section of the velocity fields was reported. It was shown that the central downward flow as well as the entrainment above the vortex ring agrees qualitatively with numerical simulation of atmospheric microburst (Proctor, 1984). The roles of vortex ring in the velocity field of microburst was discussed. The time evolution of the total circulation in vertical cross section could be fitted to the theoretical equation for that of incompressible viscous vortex.",
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AU - Obi, Shinnosuke

AU - Masuda, Shigeaki

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N2 - As a part of the laboratory experiment on an isolated microburst, the instantaneous velocity fields of an impulse-driven vortex ring impinging onto a normal wall were investigated. Vortex rings were visualized by filling ethylene glycol smoke. In this paper, as the sequel of the previous paper (Nagata et al., 2000), by employing PIV, the vertical cross-section of the velocity fields was reported. It was shown that the central downward flow as well as the entrainment above the vortex ring agrees qualitatively with numerical simulation of atmospheric microburst (Proctor, 1984). The roles of vortex ring in the velocity field of microburst was discussed. The time evolution of the total circulation in vertical cross section could be fitted to the theoretical equation for that of incompressible viscous vortex.

AB - As a part of the laboratory experiment on an isolated microburst, the instantaneous velocity fields of an impulse-driven vortex ring impinging onto a normal wall were investigated. Vortex rings were visualized by filling ethylene glycol smoke. In this paper, as the sequel of the previous paper (Nagata et al., 2000), by employing PIV, the vertical cross-section of the velocity fields was reported. It was shown that the central downward flow as well as the entrainment above the vortex ring agrees qualitatively with numerical simulation of atmospheric microburst (Proctor, 1984). The roles of vortex ring in the velocity field of microburst was discussed. The time evolution of the total circulation in vertical cross section could be fitted to the theoretical equation for that of incompressible viscous vortex.

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