Some Insights into Synthetic Jet Actuation From Analytical Modelling

Sharma, R. N. (2007). Some Insights into Synthetic Jet Actuation From Analytical Modelling. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (1242-1248). 3-7 December, 2007.

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Author Sharma, R. N.
Title of paper Some Insights into Synthetic Jet Actuation From Analytical Modelling
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 1242
End page 1248
Total pages 7
Collection year 2007
Language eng
Abstract/Summary An analytical model based on the laws of fluid dynamics for synthetic jet actuation into quiescent air as well as into external flow fields is presented. A synthetic jet actuator consists of a cavity with a driven wall and an orifice. Under actuation, the wall is oscillated resulting in an oscillatory flow through the orifice. In the model, the driven wall is modelled as a single degree of freedom mechanical system, which is pneumatically coupled to the cavity-orifice arrangement acting as a Helmholtz resonator. The latter has been modelled using the unsteady form of the continuity and Bernoulli equations with a loss term. External flow field effects are represented by fluctuating external pressure at the actuator orifice. The model has been validated against experimental data available in the published literature, and excellent agreement is obtained between the predicted and measured frequency responses as well as the phase relationships between velocities and pressures. The model and analysis based on it provides valuable insights into the behaviour of synthetic jet actuators, and reveals amongst other things, that air in the actuator cavity exhibits compressibility at all frequencies beyond the Helmholtz resonance frequency. Furthermore, the actuator output velocity is maximised when cavity Helmholtz and wall natural frequencies are brought together. The presence of an external flow field could either aid or hinder actuation depending on the phase relationship between, and the relative frequencies of, the wall forcing and external pressure fluctuations.
Subjects 290501 Mechanical Engineering
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

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Created: Wed, 19 Dec 2007, 14:45:51 EST by Laura McTaggart on behalf of School of Engineering