Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/38635
Title: Active control of vortex-airfoil interaction
Authors: Zhang, MM
Zhou, Y
Cheng, L 
Issue Date: 2004
Source: 15th Australian Fluid Mechanics Conference, The University of Sydney, Sydney, 13-17 Dec, 2004 (CD-ROM) How to cite?
Abstract: It is well known that interactions between the leading edge of a blade and incoming vortical structures produce a sharp rise in pressure, contributing significantly to the noise production in fans, turbine machines, etc. Active control of interactions between an airfoil and incoming cylinder-generated vortices has been presently investigated. The essence of the control is to create a local perturbation, using piezo-ceramic actuators, on the surface near the leading edge of the airfoil, thus modifying the airfoil-vortex interactions. Both open- and closed-loop controls are used, where the surface perturbation was controlled by an external sinusoidal wave and a feedback pressure signal from a pressure transducer installed at the leading edge, respectively. Experiments were carried out in a wind tunnel. It was observed that the closed-loop control was superior to the open-loop one; the closed- and open-loop controls achieve a maximum reduction in the pressure fluctuation at the dominant vortex frequency by 73% and 44%, respectively.
URI: http://hdl.handle.net/10397/38635
Appears in Collections:Conference Paper

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