Parabolized Stability Equation Models for Turbulent Jets and Their Radiated Sound
- Creators
- Gudmundsson, Kristjan
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Colonius, Tim
Abstract
In this paper we present several refinements to a wave-packet model of sound generation from large-scale turbulence. We examine heated and unheated jets at Mach numbers of 0.5 and 0.9. Pressure fluctuations associated with large-scale structures are modeled with the Parabolized Stability Equations (PSE) for linear disturbances to the turbulent mean-flow. We show that PSE provides better agreement with near-field microphone-array data at low frequencies than previous models based on linear stability theory. We examine the extent to which microphone data is contaminated by fluctuations uncorrelated with largescale structures. By filtering out the uncorrelated fluctuations, via the proper orthogonal decomposition (POD), better agreement between data and theory is obtained.
Additional Information
© 2009 by Kristjan Gudmundsson and Tim Colonius. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 4 Nov 2012. This work was supported by NAVAIR/TTC Technologies. We would like to express great appreciation to Dr. James Bridges and colleagues at the NASA Glenn Research Center for providing us with their data, as well as to Dr. Takao Suzuki for help with data processing.Attached Files
Published - GuhmundssonColonius2009.pdf
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Additional details
- Eprint ID
- 97198
- Resolver ID
- CaltechAUTHORS:20190717-102318476
- Naval Air Systems Command (NAVAIR)
- TTC Technologies
- Created
-
2019-07-18Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Other Numbering System Name
- AIAA Paper
- Other Numbering System Identifier
- 2009-3380