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Wavepacket models for supersonic jet noise

Published online by Cambridge University Press:  21 February 2014

Aniruddha Sinha ,
Daniel Rodríguez ,
Guillaume A. Brès  and
Tim Colonius
Aniruddha Sinha*
Affiliation:
Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Daniel Rodríguez
Affiliation:
School of Aeronautics, Universidad Politécnica de Madrid, E-28040 Madrid, Spain
Guillaume A. Brès
Affiliation:
Cascade Technologies Inc., Palo Alto, CA 94303, USA
Tim Colonius
Affiliation:
Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA
*
†Email address for correspondence: sinha.aniruddha@gmail.com
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Abstract

Gudmundsson and Colonius (J. Fluid Mech., vol. 689, 2011, pp. 97–128) have recently shown that the average evolution of low-frequency, low-azimuthal modal large-scale structures in the near field of subsonic jets are remarkably well predicted as linear instability waves of the turbulent mean flow using parabolized stability equations. In this work, we extend this modelling technique to an isothermal and a moderately heated Mach 1.5 jet for which the mean flow fields are obtained from a high-fidelity large-eddy simulation database. The latter affords a rigourous and extensive validation of the model, which had only been pursued earlier with more limited experimental data. A filter based on proper orthogonal decomposition is applied to the data to extract the most energetic coherent components. These components display a distinct wavepacket character, and agree fairly well with the parabolized stability equations model predictions in terms of near-field pressure and flow velocity. We next apply a Kirchhoff surface acoustic propagation technique to the near-field pressure model and obtain an encouraging match for far-field noise levels in the peak aft direction. The results suggest that linear wavepackets in the turbulence are responsible for the loudest portion of the supersonic jet acoustic field.

JFM classification

Instability: Absolute/convective instability Acoustics: Aeroacoustics Acoustics: Jet noise

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 742 , 10 March 2014 , pp. 71 - 95
Copyright
© 2014 Cambridge University Press 

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