Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15330
Title: Asynchronous control of vortex-induced acoustic cavity resonance using imbedded piezo-electric actuators
Authors: Zhang, MM
Cheng, L 
Zhou, Y
Issue Date: 2009
Source: Journal of the Acoustical Society of America, 2009, v. 126, no. 1, p. 36-45
Abstract: This paper presents an experimental investigation of the control of a vortex-induced acoustic cavity resonance from flow over a bluff body using embedded piezo-ceramic actuators in order to alter the resonant flow-acoustic interactions. The action of the actuators was asynchronous. Experiments were mainly conducted at the flow velocity of acoustic resonance, where the vortex shedding frequency from the upstream bluff body approached the frequency of the first acoustic mode of two downstream cavities. The fluctuating acoustic pressure was measured using a microphone. The perturbed flow field around the bluff body was monitored using two single hot wire anemometers and one X -wire. It was found that the induced transverse vibrations were effective to reduce the acoustic resonance. The cavity sound pressure level at resonance was reduced by 8.2 dB in presence of actuation. The physics behind the control mechanism is discussed.
Publisher: Acoustical Society of America
Journal: Journal of the Acoustical Society of America 
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.3143784
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