Towards the noise reduction of piezoelectrical-driven synthetic jet actuators

Jabbal, Mark; Jeyalingam, Jonne

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.

• Journal Article Type: Article
• Acceptance Date: Sep 20, 2017
• Online Publication Date: Sep 22, 2017
• Publication Date: Oct 15, 2017
• Deposit Date: Sep 29, 2017
• Publicly Available Date: Sep 23, 2018
• Journal: Sensors and Actuators A: Physical
• Print ISSN: 0924-4247
• Electronic ISSN: 0924-4247
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 266
• DOI: https://doi.org/10.1016/j.sna.2017.09.036
• Keywords: Synthetic jet actuator; Noise reduction; Dipole; Lobed orifice
• Public URL: https://nottingham-repository.worktribe.com/output/887785
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0924424717301929