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Title: Towards the noise reduction of piezoelectrical-driven synthetic jet actuators
Authors: Jabbal, M
Kykkotis, S
Keywords: Noise reduction;Piezoelectrical;Synthetic jet actuators
Issue Date: 2014
Publisher: American Institute of Aeronautics and Astronautics Inc.
Citation: 32nd AIAA Applied Aerodynamics Conference, 16-20 June 2014, Atlanta, GA
Abstract: This paper details an experimental investigation aimed at reducing the noise output of piezoelectrical-driven synthetic jet actuators without compromising peak jet velocity. Specifically, the study considers double-chamber ('back-to-back') actuators for anti-phase noise suppression and corrugated-lobed orifices as a method to enhance turbulent mixing of the jets to suppress jet noise. The study involved the design, manufacture and bench test of interchangeable actuator hardware. Hot-wire anemometry and microphone recordings were employed to acquire velocity and noise measurements respectively for each chamber configuration and orifice plate across a range of excitation frequencies and for a fixed input voltage. The data analysis indicated a 32% noise reduction (20 dBA) from operating a singlechamber, circular orifice SJA to a double-chamber, corrugated-lobed orifice SJA at the Helmholtz resonant frequency. Results also showed there was a small reduction in peak jet velocity of 7% (~3 m/s) between these two cases based on orifices of the same discharge area. Finally, the electrical-to-fluidic power conversion efficiency of the double-chamber actuator was found to be 15% across all orifice designs at the resonant frequency; approximately double the efficiency of a single-chamber actuator. This work has thus demonstrated feasible gains in noise reduction and power efficiency through synthetic jet actuator design.
ISBN: 9781624102882
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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