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Toward Active Control of Noise from Hot Supersonic Jets

Sinha, A. and Schlinker, R. H. and Simonich, J. S. and Reba, R. A. and Colonius, T. (2013) Toward Active Control of Noise from Hot Supersonic Jets. In: 19th AIAA/CEAS Aeroacoustics Conference, 27-29 May 2013, Berlin, Germany.

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We present diagnostic experiments and reduced-order models aimed at understanding and mitigating supersonic jet noise from coherent wavepackets in the turbulent shear layer, generally accepted to be the source of peak aft-angle mixing noise. The work builds on a successful Caltech/UTRC modeling approach that predicts the evolution of the wavepackets as instability waves of the turbulent mean flow, as well as the noise radiated from their near field. The models are experimentally assessed for unforced and forced supersonic isothermal and heated Mach 1.5 jets from ideal expansion nozzles. A spinning valve device is used to inject air near the nozzle lip at frequencies up to a Strouhal number of about 0.25. Results indicate a 2-3 dB benefit near peak frequencies of the spectrum and a 2 dB OASPL reduction at a mass flow percentage of 3.2. For the same injection plenum pressure, steady blowing yields more noise benefit than the unsteady actuation schemes explored until now. However, this may be explained by the slight decrease in injection velocity incurred in going from steady to unsteady operation. The reduced-order models, based on parabolized stability equations (PSE), are found to be in good agreement, in terms of envelope and phase, with those educed from the experimental data of the unforced jet. For the actuation schemes we have considered to date, the model and experimental data support a tentative explanation for the observed noise reduction in terms of attenuation of the wavepacket amplitudes by the thickened shear layer. Wavepackets induced by the harmonic component of the actuation are linearly superposed on those produced by broadband turbulence, without significant interaction, such that they lead to the addition of tones to the far-field noise that are counterproductive as far as noise reduction is concerned.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Sinha, A.0000-0002-7122-3549
Colonius, T.0000-0003-0326-3909
Additional Information:© 2013 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Published Online: 24 May 2013. The authors gratefully acknowledge support from the Office of Naval Research under contract N0014-11-1-0753 with Dr. Brenda Henderson as technical monitor, and from NAVAIR under STTR contract N68335-11-C-0026 with Dr. John Spyropoulos as technical monitor.
Funding AgencyGrant Number
Office of Naval Research (ONR)N0014-11-1-0753
Naval Air Systems Command (NAVAIR)N68335-11-C-0026
Subject Keywords:Aeroacoustics
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Other Numbering System NameOther Numbering System ID
AIAA Paper2013-2234
Record Number:CaltechAUTHORS:20190712-112322809
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97120
Deposited By: Melissa Ray
Deposited On:15 Jul 2019 20:17
Last Modified:16 Nov 2021 17:26

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