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Wavelet decomposition of hydrodynamic and acoustic pressures in the near field of the jet

Published online by Cambridge University Press:  26 January 2017

Matteo Mancinelli Open the ORCID record for Matteo Mancinelli [Opens in a new window] ,
Tiziano Pagliaroli ,
Alessandro Di Marco ,
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 Roma Tre, Via della Vasca Navale 79, 00146 Rome, Italy
Alessandro Di Marco
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via della Vasca Navale 79, 00146 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

An experimental investigation of pressure fluctuations generated by a single-stream compressible jet is carried out in an anechoic wind tunnel. Measurements are performed using a linear array of microphones installed in the near region of the jet and a polar arc of microphones in the far field. The main focus of the paper is on the analysis of the pressure fluctuations in the near field. Three novel signal processing techniques are presented to provide the decomposition of the near-field pressure into hydrodynamic and acoustic components. The procedures are all based on the application of the wavelet transform to the measured pressure data and possess the distinctive property of requiring a very simple arrangement to obtain the desired results (one or two microphones at most). The hydrodynamic and acoustic pressures are characterized separately in terms of their spectral and statistical quantities and a direct link between the acoustic pressure extracted from the near field and the actual noise in the far field is established. The analysis of the separated pressure components sheds light on the nearly Gaussian nature/intermittent behaviour of the acoustic/hydrodynamic pressure. The higher sensitivity of the acoustic component to the Mach number variation has been highlighted as well as the different propagation velocities of the two pressure components. The achieved outcomes are validated through the application to the same data of existing separation procedures evidencing the advantages and limitations of the new methods.

JFM classification

Acoustics: Aeroacoustics Turbulent Flows: Intermittency Acoustics: Jet noise
Type
Papers
Information
Journal of Fluid Mechanics , Volume 813 , 25 February 2017 , pp. 716 - 749
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Copyright
© 2017 Cambridge University Press 

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