characterization and flow physics of plasma synthetic jet actuators PDF
Preview characterization and flow physics of plasma synthetic jet actuators
UUnniivveerrssiittyy ooff KKeennttuucckkyy UUKKnnoowwlleeddggee University of Kentucky Doctoral Dissertations Graduate School 2007 CCHHAARRAACCTTEERRIIZZAATTIIOONN AANNDD FFLLOOWW PPHHYYSSIICCSS OOFF PPLLAASSMMAA SSYYNNTTHHEETTIICC JJEETT AACCTTUUAATTOORRSS Arvind Santhanakrishnan University of Kentucky, [email protected] RRiigghhtt cclliicckk ttoo ooppeenn aa ffeeeeddbbaacckk ffoorrmm iinn aa nneeww ttaabb ttoo lleett uuss kknnooww hhooww tthhiiss ddooccuummeenntt bbeenneefifittss yyoouu.. RReeccoommmmeennddeedd CCiittaattiioonn Santhanakrishnan, Arvind, "CHARACTERIZATION AND FLOW PHYSICS OF PLASMA SYNTHETIC JET ACTUATORS" (2007). University of Kentucky Doctoral Dissertations. 545. https://uknowledge.uky.edu/gradschool_diss/545 This Dissertation is brought to you for free and open access by the Graduate School at UKnowledge. It has been accepted for inclusion in University of Kentucky Doctoral Dissertations by an authorized administrator of UKnowledge. For more information, please contact [email protected]. ABSTRACT OF DISSERTATION Arvind Santhanakrishnan The Graduate School University of Kentucky 2007 CHARACTERIZATION AND FLOW PHYSICS OF PLASMA SYNTHETIC JET ACTUATORS ABSTRACT OF DISSERTATION A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering in the College of Engineering at the University of Kentucky By Arvind Santhanakrishnan Lexington, Kentucky Director: Dr. Jamey D. Jacob, Associate Professor of Mechanical and Aerospace Engineering Oklahoma State University, Stillwater, Oklahoma 2007 Copyright (cid:13)c by Arvind Santhanakrishnan 2007 ABSTRACT OF DISSERTATION CHARACTERIZATION AND FLOW PHYSICS OF PLASMA SYNTHETIC JET ACTUATORS Plasmasyntheticjetactuatorsareinvestigatedexperimentally,inwhichthegeometrical designofsingledielectricbarrierdischarge(SDBD)plasmaactuatorsismodifiedtoproduce zero-mass flux jets similar to those created by mechanical devices. The SDBD plasma actuator consists of two rectangular electrodes oriented asymmetrically and separated by a layerofdielectricmaterial. Underaninputofhighvoltage,highfrequencyACorpulsedDC, a region of plasma is created in the interfacial air gap on account of electrical breakdown of the ambient air. A coupling between the electric field in the plasma and the neutral air near the actuator is introduced, such that the latter experiences a net force which results in a horizontal wall jet. This effect of the actuator has been demonstrated to be useful in mitigating boundary layer separation in aerodynamic flows. To increase the impact that a plasma actuator may have on the flow field, this research investigates the development and characterization of a novel flow control device, the plasma synthetic jet actuator, which tailors the residual air in the form of a vertical jet resembling conventional continuous and synthetic jets. This jet can be either three dimensional using annular electrode arrays, or nearly two dimensional using two rectangular strip exposed electrodes and one embedded electrode. Detailed measurements on the isolated plasma synthetic jet reveal that pulsed operation of the actuator results in the formation of multiple counter- rotating vortical structures in the flow field. The output jet velocity and momentum are found to be higher for unsteady pulsing as compared to steady operation. In the case of flow over a flat plate, the actuator is observed to create a localized interaction region within which the baseline flow direction and boundary layer characteristics are modified. The efficiency of the actuator in coupling momentum to the neutral air is found to be related to the plasma morphology, pulsing frequency, actuator dimension, and input power. An analytical scaling model is proposed to describe the effects of varying the above variables on the output jet characteristics and actuator efficiency, and the experimental data is used for model validation. KEYWORDS: Active Flow Control, Plasma Actuators, Synthetic Jets, Particle Image Ve- locimetry, Jet Flows. Arvind Santhanakrishnan August 31, 2007 CHARACTERIZATION AND FLOW PHYSICS OF PLASMA SYNTHETIC JET ACTUATORS By Arvind Santhanakrishnan Dr. Jamey D. Jacob (Director of Dissertation) Dr. L. S. Stephens (Director of Graduate Studies) August 31, 2007 (Date) RULES FOR THE USE OF DISSERTATIONS UnpublisheddissertationssubmittedfortheDoctor’sdegreeanddepositedintheUniversity of Kentucky Library are as a rule open for inspection, but are to be used only with due regard to the rights of the authors. Bibliographical references may be noted, but quotations or summaries of parts may be published only with the permission of the author, and with the usual scholarly acknowledgments. Extensive copying or publication of the dissertation in whole or in part requires also the consent of the Dean of The Graduate School of the University of Kentucky. A library which borrows this dissertation for use by its patrons is expected to secure the signature of each user. Name Date DISSERTATION Arvind Santhanakrishnan The Graduate School University of Kentucky 2007 CHARACTERIZATION AND FLOW PHYSICS OF PLASMA SYNTHETIC JET ACTUATORS DISSERTATION A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering in the College of Engineering at the University of Kentucky By Arvind Santhanakrishnan Lexington, Kentucky Director: Dr. Jamey D. Jacob, Associate Professor of Mechanical and Aerospace Engineering Oklahoma State University, Stillwater, Oklahoma 2007 Copyright (cid:13)c by Arvind Santhanakrishnan 2007 This dissertation is dedicated to the loving memory of my grandparents, Lakshmi and Parthasarathy. Thank you for always watching over me.
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