Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32944
Title: Closed-loop control of vortex-airfoil interaction noise
Authors: ZHANG, Mm
Cheng, L 
ZHOU, Y
Keywords: Active control
Blade-vortex interaction
Perturbation technique
Issue Date: 2006
Publisher: Elsevier
Source: Journal of hydrodynamics, Ser.B, 2006, v. 18, no. 3 SUPPL., p. 430-437 How to cite?
Journal: Journal of hydrodynamics, Ser.B 
Abstract: 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. Piezo-ceramic 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. While 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/10397/32944
ISSN: 1001-6058
DOI: 10.1016/S1001-6058(06)60089-9
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

Page view(s)

33
Last Week
1
Last month
Checked on Aug 13, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.