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Active flow control of a precessing jet Open Access


Other title
Jet actuation
Active flow control
Real time monitoring
Stereoscopic PIV
Phase plane
Precessing jet
Type of item
Degree grantor
University of Alberta
Author or creator
Babazadeh, Hamed
Supervisor and department
Nobes, David S. (Mechanical Engineering)
Koch, Charles Robert (Mechanical Engineering)
Examining committee member and department
Kresta, Suzanne M. (Chemical and Materials Engineering)
Flynn, Morris R. (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
Master of Science
Degree level
Active flow control of a precessing jet is the focus of this work. A round jet confined by a round cavity exhibits a self-excited rotational motion, precession, for a specific range of cavity lengths. Active flow control of this unstable flow provides the ability to control near-field mixing of the precessing jet. Twelve micro-jets on the periphery of the nozzle inlet are used as actuation and near-field pressure data is measured by four pressure probes at the chamber exit to monitor the flow behavior. A phase plane, based on pressure signals, is used to find a Reynolds number and actuation frequency range where actuation stabilizes the flow motion. Phase-locked stereoscopic PIV is also used to validate the pressure processing tool. The results confirm the pressure measurement and micro-jet actuation can be employed to develop a future closed-loop flow control on a precessing jet.
License granted by Hamed Babazadeh ( on 2010-12-01T22:07:42Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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