Hydrodynamic Stability of a Periodically Unsteady Swirling Jet
Publication: Journal of Engineering Mechanics
Volume 135, Issue 9
Abstract
The stability characteristics of a jet with a low-frequency time-dependent periodic swirl are determined. An analytical dispersion relation for the perturbations is obtained and solved numerically. Growth rates and celerities determined from this formulation are compared with predictions based on applying steady state analysis to instantaneous velocity profiles, i.e., the quasisteady approach. The results show that periodic unsteadiness in the swirl causes variations in the growth rates and celerities of the unstable modes. Furthermore, it is shown that the quasisteady approach is not applicable and fails to predict the magnitudes of these variations.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 135 • Issue 9 • September 2009
Pages: 1000 - 1005
Copyright
© 2009 ASCE.
History
Received: Jun 20, 2008
Accepted: Jan 15, 2009
Published online: Mar 6, 2009
Published in print: Sep 2009
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