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Linear Stability Analysis of Chevron Jet Profiles

Gudmundsson, Kristjan and Colonius, Tim (2006) Linear Stability Analysis of Chevron Jet Profiles. In: ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Vol.2. American Society of Mechanical Engineers , New York, NY, pp. 497-504. ISBN 0-7918-4751-9. https://resolver.caltech.edu/CaltechAUTHORS:20190214-074713989

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Abstract

We investigate the linear stability characteristics of the mean velocity profiles produced by chevron nozzles. We show that chevron instability waves can be decomposed into azimuthal modes analogously to those of round jets. This facilitates a direct comparison of growth rates and mode structure between different nozzles. We find that the three nozzles used in this study share a set of modes, referred to as primary modes. In addition, we find that there exist modes unique to the chevrons nozzles, termed secondary modes. While chevron jets possess a much larger number of unstable modes, the modes with lowest azimuthal structure show strong suppression of growth rates in two different chevron jets. Some preliminary implications on sound generation are discussed.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1115/FEDSM2006-98485DOIArticle
ORCID:
AuthorORCID
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2006 by ASME. The authors acknowledge the support of an AearoAcoustics Research Consortium (AARC) grant from the Ohio Aerospace Institute (OAI). In addition, we would like to express great appreciation to Dr. James Bridges and colleagues at the NASA Glenn Research Center for collecting and providing the data used in this study. In addition, we would like to thank Dr. Takao Suzuki for useful discussions.
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Funding AgencyGrant Number
Ohio Aerospace InstituteUNSPECIFIED
Record Number:CaltechAUTHORS:20190214-074713989
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190214-074713989
Official Citation:Gudmundsson K, Colonius T. Linear Stability Analysis of Chevron Jet Profiles. ASME. Fluids Engineering Division Summer Meeting, Volume 2: Fora: 497-504. doi:10.1115/FEDSM2006-98485
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92915
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Feb 2019 15:53
Last Modified:03 Oct 2019 20:49

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