caa a22 4500 606198989 CHVBK 20210128100936.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00348-014-1883-5 doi (NATIONALLICENCE)springer-10.1007/s00348-014-1883-5 Intermittency of the near pressure field induced by a compressible coaxial jet [Elektronische Daten] [Daniele Grassucci, Roberto Camussi, Peter Jordan, Silvano Grizzi] A novel method of analysis based on the combined use of the wavelet transform and linear stochastic estimation (LSE) is applied to pressure and velocity signals obtained in a coaxial jet at low subsonic flow conditions. The aim of the analysis is to identify and clarify the role of intermittency in the generation of noise. The wavelet analysis extracts intermittent events from the near field pressure signals and the LSE technique identifies velocity fluctuations which are linearly associated with the selected pressure fluctuations. A frequency-wavenumber filtering procedure is also applied to the near field pressure in order to separate the hydrodynamic and the acoustic components. The results achieved helps to identify and localize fluid dynamic events responsible for the generation of near field hydrodynamic and acoustic intermittent pressure fluctuations. Springer-Verlag Berlin Heidelberg, 2015 Grassucci Daniele Dipartimento di Ingegneria, Università Roma Tre, Via della Vasca Navale 79, 00146, Rome, Italy aut Camussi Roberto Dipartimento di Ingegneria, Università Roma Tre, Via della Vasca Navale 79, 00146, Rome, Italy aut Jordan Peter Institut PPRIME, CNRS UPR 3346, Université de Poitiers, ENSMA, 86000, Poitiers, France aut Grizzi Silvano Consiglio Nazionale delle Ricerche-Istituto Nazionale per Studi ed Esperienze di Architettura Navale, Via di Vallerano 139, 00128, Rome, Italy aut Experiments in Fluids Springer Berlin Heidelberg 56/2(2015-02-01), 1-13 0723-4864 56:2<1 2015 56 348 https://doi.org/10.1007/s00348-014-1883-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-014-1883-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grassucci Daniele Dipartimento di Ingegneria, Università Roma Tre, Via della Vasca Navale 79, 00146, Rome, Italy aut NATIONALLICENCE 700 1- Camussi Roberto Dipartimento di Ingegneria, Università Roma Tre, Via della Vasca Navale 79, 00146, Rome, Italy aut NATIONALLICENCE 700 1- Jordan Peter Institut PPRIME, CNRS UPR 3346, Université de Poitiers, ENSMA, 86000, Poitiers, France aut NATIONALLICENCE 700 1- Grizzi Silvano Consiglio Nazionale delle Ricerche-Istituto Nazionale per Studi ed Esperienze di Architettura Navale, Via di Vallerano 139, 00128, Rome, Italy aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/2(2015-02-01), 1-13 0723-4864 56:2<1 2015 56 348