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A Study of the Role of Organized Structures in Jet Noise Generation

Reba, R. and Narayanan, S. and Colonius, T. and Dunlop, M. J. (2003) A Study of the Role of Organized Structures in Jet Noise Generation. In: 9th AIAA/CEAS Aeroacoustics Conference and Exhibit, 12-14 May 2003, Hilton Head, SC.

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We present analytical, experimental and computational studies aimed at understanding the role of large-scale, organized structures in noise generation from high-speed, compressible jets. Two-point near-field pressure data from experiments are analyzed and used to identify parameters in a wave-packet based model for noise generation from organized, large-scale structures. The statistical spectrum of far field pressure is expressed in terms of two-point space-time correlations of the near-field pressure on a surface enclosing the jet. The surface is assumed to be sufficiently near the turbulent region tobe dominated by non-propagating hydrodynamic disturbances, yet sufficiently far such that linear behavior can be assumed in extending the near-field pressure to the far field. Validity of such assumptions is investigated by interrogating the jet DNS database of Freund [J. Fluid Mech. 438:277-305 2001]. The DNS data analysis is also used to investigate the impact of limited spatial resolution in the experiments. The analytical model is used to study far field noise generation from organized structures. Results show that, for sufficiently short structure lifetime, aft angle far field pressure spectra tend to exhibit frequency scaling with Helmholtz number, rather than Strouhal number.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Paper Paper
Colonius, T.0000-0003-0326-3909
Additional Information:© 2003 by United Technologies Corporation. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 4 Nov 2012. This work is jointly funded by United Technologies Research Center and Pratt & Whitney. The authors would like to thank R. Schlinker and W. Lord for their support and fruitful discussions, Dr. Takao Suzuki for his assistance with signal processing of the DNS data, and Prabir Barooah and Keith Post for their assistance in acquiring the experimental data. The authors are grateful to Prof. Jon Freund for access to his database for the turbulent Mach 0.9 jet.
Funding AgencyGrant Number
United Technologies Research CenterUNSPECIFIED
Pratt & WhitneyUNSPECIFIED
Subject Keywords:Aeroacoustics
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AIAA Paper2003-3314
Record Number:CaltechAUTHORS:20190718-165128014
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97275
Deposited By: Melissa Ray
Deposited On:26 Jul 2019 18:20
Last Modified:16 Nov 2021 17:30

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