Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5282
Title: Closed-loop controlled vortex-airfoil interactions
Authors: Zhang, MM
Cheng, L 
Zhou, Y
Keywords: Vortices
Aerodynamics
Noise abatement
Flow control
Flow visualisation
Closed loop systems
Feedback
Blades
Issue Date: Apr-2006
Publisher: American Institute of Physics
Source: Physics of fluids, Apr. 2006, v. 18, no. 4, 046102, p. 1-12 How to cite?
Journal: Physics of fluids 
Abstract: Closed-loop controlled interactions between an airfoil and impinging vortices were experimentally investigated. This work aims to minimize the fluctuating flow pressure (p) at the leading edge of the airfoil, which is a major source of the blade-vortex interaction noises commonly seen in rotorcrafts. Piezoceramic actuators were used to create a local surface perturbation near the leading edge of the airfoil in order to alter the airfoil-vortex interaction. Two closed-loop control schemes were investigated, which deployed p and the streamwise fluctuating flow velocity (u) as the feedback signal, respectively. As the control effect on p was measured using a fast response pressure transducer, the oncoming vortical flow was monitored using a particle image velocimetry and a hot wire. It was found that the control scheme based on the feedback signal u led to a pronounced impairment in the strength of oncoming vortices and meanwhile a maximum reduction in p by 39%, outperforming the control scheme based on the feedback signal p. Physics behind the observations is discussed.
URI: http://hdl.handle.net/10397/5282
ISSN: 1070-6631 (print)
1089-7666 (online)
DOI: 10.1063/1.2189287
Rights: © 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in M. M. Zhang, L. Cheng & Y. Zhou, Physics of Fluids 18, 046102 (2006) and may be found at http://link.aip.org/link/?phf/18/046102
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