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Identification of Jet Instability Waves and Design of a Microphone Array

Suzuki, Takao and Colonius, Tim (2004) Identification of Jet Instability Waves and Design of a Microphone Array. In: 10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester, United Kingdom.

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We propose a diagnostic technique to detect instability waves in a round jet using a conical microphone array. The detection algorithm is analogous to the beam-forming technique, which is used with a far-field microphone array to localize noise sources. By replacing the reference solutions used in the conventional beam-forming with eigenfunctions from a linear stability analysis, the amplitude of the low-frequency azimuthal instability waves can be inferred. We use a DNS database and experimental measurements of the mean flow to design a phased microphone array which is placed just outside the shear layer near the nozzle exit. We validate the technique in experiments by checking for consistency of the radial decay, phase correlation, and streamwise evolution of the hydrodynamic pressure. The comparison between the experiment and linear stability analysis shows good agreement, particularly near the most amplified frequency of each azimuthal mode.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2004 by Takao Suzuki and Tim Colonius. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 11 Nov 2012. The authors would like to acknowledge partial support of the AeroAcoustics Research Consortium (AARC) grant from the Ohio Aerospace Institute (OAI). We sincerely appreciate the experiments conducted by Drs. J. Bridges, S.-S. Lee, and their colleagues at NASA Glenn Research Center as well as fruitful discussion with their group. We also thank Prof. J. Freund at the University of Illinois for the DNS database and Drs. S. Narayanan, R. Reba, and R. Schlinker at the United Technologies Research Center for technical discussion regarding jet noise experiments.
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Ohio Aerospace InstituteUNSPECIFIED
Subject Keywords:Aeroacoustics
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AIAA Paper2004-2960
Record Number:CaltechAUTHORS:20190718-165127351
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97272
Deposited By: Melissa Ray
Deposited On:25 Jul 2019 21:27
Last Modified:16 Nov 2021 17:30

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