2017
DOI: 10.1017/jfm.2017.839
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On the hydrodynamic and acoustic nature of pressure proper orthogonal decomposition modes in the near field of a compressible jet

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.… Show more

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Cited by 40 publications
(12 citation statements)
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“…2018; Mancinelli et al. 2018). In the following analysis, POD is used to educe the coherent structures that form the downstream-convecting component of the aeroacoustic resonance process, and to analyse the relationship between simultaneous processes.…”
Section: The Hydrodynamic Field Of Coupled Underexpanded Jetsmentioning
confidence: 99%
See 1 more Smart Citation
“…2018; Mancinelli et al. 2018). In the following analysis, POD is used to educe the coherent structures that form the downstream-convecting component of the aeroacoustic resonance process, and to analyse the relationship between simultaneous processes.…”
Section: The Hydrodynamic Field Of Coupled Underexpanded Jetsmentioning
confidence: 99%
“…Resonant processes in jets are generally amenable to decomposition via proper orthogonal decomposition (POD) (Lumley 1967;Sirovich 1987a,b). The fluctuations associated with resonance are typically well described using a relatively small number of modes (Edgington-Mitchell, Honnery & Soria 2014a,2015; Weightman et al 2016Weightman et al , 2017Berry, Magstadt & Glauser 2017;Tan et al 2017;Crawley et al 2018;Mancinelli et al 2018). In the following analysis, POD is used to educe the coherent structures that form the downstream-convecting component of the aeroacoustic resonance process, and to analyse the relationship between simultaneous processes.…”
Section: The Hydrodynamic Field Of Coupled Underexpanded Jetsmentioning
confidence: 99%
“…06 - Wavelet decomposition for the far-field noise measurement is carried out to identify a possible influence of the hydrodynamic component propagating into the far-field region. The wavelet decomposition method employed is the WT3 [54], which is based on an iterative procedure capable of extracting the coherent structures from the pressure field. Thus the hydrodynamic component is related to the wavelet coefficients larger than the threshold level and the acoustic component to the wavelet coefficients lower than the threshold level as defined in Mancinelli et al [54].…”
Section: A Far-field Noisementioning
confidence: 99%
“…Data were acquired by a National Instruments PXIe-1071 acquisition card with a sampling frequency of 200 kHz which provides a maximum resolved Strouhal number range [2, 3.2] well above the St of interest in this paper. The acquisition time was set equal to 30 s, which is six orders of magnitude larger than the longest convective time, thus ensuring statistical convergence of the quantities presented in the paper [21]. An azimuthal array of six microphones was placed in the nozzle exit plane and radial distance r/D = 1.…”
Section: Experimental Set-upmentioning
confidence: 99%