Linear Stability Analysis of Chevron Jet Profiles
- Creators
- Gudmundsson, Kristjan
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Colonius, Tim
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.
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.Attached Files
Published - 0ccbd61dfbb636eded89d2180f4df1dc45a3.pdf
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Additional details
- Eprint ID
- 92915
- Resolver ID
- CaltechAUTHORS:20190214-074713989
- Ohio Aerospace Institute
- Created
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2019-02-14Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field