Formation process of vortex ring generated by a pulsating jet flow

Fujio Akagi, Yuuki Okuzono, Youichi Ando, Sumio Yamaguchi, Masato Furukawa

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

The formation process of a vortex ring generated by a pulsating jet flow, which is called the cyclic vortex ring, is investigated experimentally with PIV measurement. The waveform of the jet flow is conducted using sine curves by changing the amplitude of Reynolds' numbers Re 0 of 1200∼5040 and Womersley numbers a of 12.5∼24.4. The results indicate that the formation process of the cyclic vortex ring is different from the laminar vortex ring Another vortex ring which is formed from separated wall boundary layers in the nozzle during the suction period, which is called the separation vortex ring, is transported toward the nozzle exit during the discharge period. This separation vortex ring interferes with the formation process of the cyclic vortex ring at the nozzle exit plane. The circulation of the separation vortex ring depends on the pulsating conditions of the jet flow. Distribution of the vorticity around the core center of the cyclic vortex ring is in good agreement with the Oseen vortex model. The formation process of the cyclic vortex ring is classified into three categories, depending on Strouhal number.

本文言語英語
ページ(範囲)546-556
ページ数11
ジャーナルNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
77
775
DOI
出版ステータス出版済み - 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

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