Abstract
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 C d . 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 C i ' is reduced by approximately 70% of the natural condition with the reversal phase mode.
| Original language | English |
|---|---|
| Pages (from-to) | 579-585 |
| Number of pages | 7 |
| Journal | Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 70 |
| Issue number | 691 |
| DOIs | |
| Publication status | Published - Jan 1 2004 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
Cite this
Active control of vortex shedding and fluid-dynamic forces on a square cylinder by micro-excitation of sidewall surfaces. / Oda, Manabu; Yamamoto, Yoshihisa; Takaki, Atsushi; Furukawa, Masato; Inoue, Masahiro.
In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 70, No. 691, 01.01.2004, p. 579-585.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Active control of vortex shedding and fluid-dynamic forces on a square cylinder by micro-excitation of sidewall surfaces
AU - Oda, Manabu
AU - Yamamoto, Yoshihisa
AU - Takaki, Atsushi
AU - Furukawa, Masato
AU - Inoue, Masahiro
PY - 2004/1/1
Y1 - 2004/1/1
N2 - 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 C d . 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 C i ' is reduced by approximately 70% of the natural condition with the reversal phase mode.
AB - 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 C d . 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 C i ' is reduced by approximately 70% of the natural condition with the reversal phase mode.
UR - http://www.scopus.com/inward/record.url?scp=2942627954&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2942627954&partnerID=8YFLogxK
U2 - 10.1299/kikaib.70.579
DO - 10.1299/kikaib.70.579
M3 - Article
VL - 70
SP - 579
EP - 585
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 691
ER -