Towards the noise reduction of piezoelectrical-driven synthetic jet actuators

Jabbal, Mark and Jeyalingam, Jonne (2017) Towards the noise reduction of piezoelectrical-driven synthetic jet actuators. Sensors and Actuators A: Physical, 266 . pp. 273-284. ISSN 0924-4247

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Abstract

This work details an experimental investigation aimed at reducing the noise output of piezoelectrical-driven synthetic jet actuators while minimising peak jet velocity reduction. The study considers double-chamber actuator for anti-phase noise suppression and lobed orifice as a method to enhance jet turbulent mixing 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 sound pressure level measurements respectively across a range of excitation frequencies for a fixed diaphragm clamping and input voltage. The data analysis indicated a 26% noise reduction (16 dB) from operating a single-chamber, round orifice actuator to a double-chamber, lobed orifice one at the synthetic jet 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. The electrical-to-fluidic power conversion efficiency of the double-chamber actuator was found to be 15% for both orifice types at the resonant frequency; approximately double the efficiency of a single-chamber actuator.

Item Type: Article
Keywords: Synthetic jet actuator; Noise reduction; Dipole; Lobed orifice
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: 10.1016/j.sna.2017.09.036
Depositing User: Jabbal, Mark
Date Deposited: 29 Sep 2017 12:06
Last Modified: 14 Oct 2017 08:48
URI: http://eprints.nottingham.ac.uk/id/eprint/46743

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