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Open AccessArticle

Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data

1
School of Engineering, Parsons Building, Trinity College, Dublin 2, Ireland
2
Department of Aerospace and Mechanical Engineering, University of Notre Dame, South Bend, IN 46556, USA
3
Mechanical & Design Engineering School, Dublin Institute of Technology, Dublin 2, Ireland
*
Author to whom correspondence should be addressed.
Actuators 2018, 7(4), 67; https://doi.org/10.3390/act7040067
Received: 31 August 2018 / Revised: 24 September 2018 / Accepted: 26 September 2018 / Published: 28 September 2018
(This article belongs to the Special Issue Synthetic Jet Actuators)
Synthetic jet actuators (SJA) are emerging in various engineering applications, from flow separation and noise control in aviation to thermal management of electronics. A SJA oscillates a flexible membrane inside a cavity connected to a nozzle producing vortices. A complex interaction between the cavity pressure field and the driving electronics can make it difficult to predict performance. A reduced-order model (ROM) has been developed to predict the performance of SJAs. This paper applies this model to a canonical configuration with applications in flow control and electronics cooling, consisting of a single SJA with a rectangular orifice, emanating perpendicular to the surface. The practical implementation of the ROM to estimate the relationship between cavity pressure and jet velocity, jet velocity and diaphragm deflection and applied driving voltage is explained in detail. Unsteady Reynolds-averaged Navier Stokes computational fluid dynamics (CFD) simulations are used to assess the reliability of the reduced-order model. The CFD model itself has been validated with experimental measurements. The effect of orifice aspect ratio on the ROM parameters has been discussed. Findings indicate that the ROM is capable of predicting the SJA performance for a wide range of operating conditions (in terms of frequency and amplitude). View Full-Text
Keywords: synthetic jet; reduced-order model; lumped-element model; gas dynamics; Helmholtz resonance; piezoelectric actuator; electromagnetic actuator; computational fluid dynamics synthetic jet; reduced-order model; lumped-element model; gas dynamics; Helmholtz resonance; piezoelectric actuator; electromagnetic actuator; computational fluid dynamics
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Persoons, T.; Cressall, R.; Alimohammadi, S. Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data. Actuators 2018, 7, 67.

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