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On the hydrodynamic and acoustic nature of pressure proper orthogonal decomposition modes in the near field of a compressible jet

Published online by Cambridge University Press:  13 December 2017

Matteo Mancinelli Open the ORCID record for Matteo Mancinelli [Opens in a new window] ,
Tiziano Pagliaroli ,
Roberto Camussi  and
Thomas Castelain
Matteo Mancinelli*
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via della Vasca Navale 79, 00146 Rome, Italy
Tiziano Pagliaroli
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Niccolò Cusano, Via Don Carlo Gnocchi 3, 00166 Rome, Italy
Roberto Camussi
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via della Vasca Navale 79, 00146 Rome, Italy
Thomas Castelain
Affiliation:
Laboratoire de Mécanique des Fluides et d’Acoustique – UMR 5509, École Centrale de Lyon, 36 av. Guy de Collongue, 69134 Ecully CEDEX, France
*
†Email address for correspondence: matteo.mancinelli@uniroma3.it
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Abstract

In this work an experimental investigation of the near-field pressure of a compressible jet is presented. The proper orthogonal decomposition (POD) of the pressure fluctuations measured by a linear array of microphones is performed in order to provide the streamwise evolution of the jet structure. The wavenumber–frequency spectrum of the space–time pressure fields re-constructed using each POD mode is computed in order to provide the physical interpretation of the mode in terms of hydrodynamic/acoustic nature. Specifically, non-radiating hydrodynamic, radiating acoustic and ‘hybrid’ hydro-acoustic modes are found based on the phase velocity associated with the spectral energy bumps in the wavenumber–frequency domain. Furthermore, the propagation direction in the far field of the radiating POD modes is detected through the cross-correlation with the measured far-field noise. Modes associated with noise emissions from large/fine scale turbulent structures radiating in the downstream/sideline direction in the far field are thus identified.

JFM classification

Acoustics: Aeroacoustics Acoustics: Jet noise
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 836 , 10 February 2018 , pp. 998 - 1008
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Copyright
© 2017 Cambridge University Press 

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