Active control of vortex shedding and fluid-dynamic forces on a square cylinder by micro-excitation of sidewall surfaces

Manabu Oda, Yoshihisa Yamamoto, Atsushi Takaki, Masato Furukawa, Masahiro Inoue

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

The experimental studies on active control of vortex shedding frequency were conducted to suppress fluid-dynamic forces of a square cylinder. Each sidewall of the cylinder consists of four vibrating side-plates equipped with piezoelectric actuators. The vortex shedding frequency was controlled by means of a lock-in phenomenon that was caused by vibrating the side-plates transversely with amplitude less than 100 μm. The results are summarized as follows: (1) the spanwise synchronous excitation brings about reduction of the time-averaged drag coefficient Cd. It is reduced by approximately 20% of the natural condition. (2) When a half span of sidewall surface is vibrated with 180 degrees differential phase against the other half span, the vortices shed from each half span in the reversal phase mode. The fluctuating lift coefficient Ci' is reduced by approximately 70% of the natural condition with the reversal phase mode.

本文言語英語
ページ(範囲)579-585
ページ数7
ジャーナルNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
70
691
DOI
出版ステータス出版済み - 3 2004

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 機械工学

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