Enabling Micro Synthetic Jet Actuators in Boundary Layer Separation Control Using Flow Instability

Hong, Guang (2007). Enabling Micro Synthetic Jet Actuators in Boundary Layer Separation Control Using Flow Instability. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, Mee, David, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (887-891). 3-7 December, 2007.

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Author Hong, Guang
Title of paper Enabling Micro Synthetic Jet Actuators in Boundary Layer Separation Control Using Flow Instability
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
Mee, David
Rose Clements
Richard Morgan
Charles Lemckert
Start page 887
End page 891
Total pages 5
Collection year 2007
Language eng
Abstract/Summary Research on synthetic jet actuators (SJAs) has shown great potential of using SJAs in control of boundary layer flow separation to reduce the drag and increase the efficiency of aerodynamic devices. The challenge lies in developing an actuator not only small, light, robust and economic, but also capable of reaching the control objectives. This paper presents an idea of using the flow instability to enhance the actuation of a SJA. In the case of controlling laminar separation, the SJA is used to trigger frictional Tollmien-Schlichting (T-S) instability. At a forcing frequency strategically determined, the triggered T-S instability which is originally weak can be enhanced by the frictionless Kelvin- Helmholtz (K-H) instability of the baseline flow, until the T-S instability becomes substantially strong to resist the separation. The effective actuation of a SJA in resisting laminar separation caused by adverse pressure gradient in a boundary layer is demonstrated by experimental results of profiles of mean and fluctuating velocities. The orifice diameter, which is the characteristic dimension, of the SJA is 500 μm. The forcing voltage is only ±7.5V., and the forcing frequency is 100 Hz. The Reynolds number is in a range of 1.78x105~2.24x105. Boundary layer properties are used to understand the associated physics, and disturbance intensity is first time used to evaluate the effectiveness of the SJA. Analysis of the experimental results led to the conclusion that flow instability plays a critical role in enabling a micro SJA and also in making the control effectiveness less dependent or independent of the detailed structure and size of the actuator.
Subjects 290000 Engineering and Technology
Keyword synthetic jet actuators
aerodynamic devices
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: 16th Australasian Fluid Mechanics Conference
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Created: Thu, 20 Dec 2007, 09:11:11 EST by Bikash Das on behalf of School of Engineering