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

被引：0

作者：

Oda, Manabu ^{[1
]}

Yamamoto, Yoshihisa ^{[1
]}

Takaki, Atsushi ^{[1
]}

Furukawa, Masato ^{[1
]}

Inoue, Masahiro ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Kyushu University, 6-10-1 Hakozaki, Fukuoka-shi, Fukuoka, 821-8581, Japan

来源：

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2004年 / 70卷 / 691期

关键词：

Actuators - Flow control - Fluid dynamics - Mechanical engineering - Piezoelectric devices - Vibrations (mechanical) - Vortex shedding - Wakes;

D O I：

10.1299/kikaib.70.579

中图分类号：

学科分类号：

摘要：

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.

引用

页码：579 / 585