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http://hdl.handle.net/10397/5282
Title: | Closed-loop controlled vortex-airfoil interactions | Authors: | Zhang, MM Cheng, L Zhou, Y |
Issue Date: | Apr-2006 | Source: | Physics of fluids, Apr. 2006, v. 18, no. 4, 046102, p. 1-12 | 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. | Keywords: | Vortices Aerodynamics Noise abatement Flow control Flow visualisation Closed loop systems Feedback Blades |
Publisher: | American Institute of Physics | Journal: | Physics of fluids | 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 |
Appears in Collections: | Journal/Magazine Article |
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Zhang_Closed-loop_Vortex-airfoil_Interactions.pdf | 836.95 kB | Adobe PDF | View/Open |
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