Benvenuti nell'Anagrafe della Ricerca d'Ateneo
La valutazione delle attività di ricerca che si svolgono nelle università ha assunto un'importanza rilevante sia per l'intero sistema universitario sia all'interno di ogni singolo ateneo. Roma Tre si è quindi dotata di idonei strumenti informativi in grado di supportare al meglio le azioni di monitoraggio e di valutazione delle attività di ricerca svolte nei propri dipartimentied ha realizzato una Anagrafe della Ricerca di Ateneo.
EnglishIn 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.
Mancinelli, M., Pagliaroli, T., Camussi, R., & Castelain, T. (2018). On the hydrodynamic and acoustic nature of pressure proper orthogonal decomposition modes in the near field of a compressible jet. JOURNAL OF FLUID MECHANICS, 836, 998-1008 [10.1017/jfm.2017.839].
| Titolo: | On the hydrodynamic and acoustic nature of pressure proper orthogonal decomposition modes in the near field of a compressible jet | |
| Autori: | ||
| Data di pubblicazione: | 2018 | |
| Rivista: | ||
| Citazione: | Mancinelli, M., Pagliaroli, T., Camussi, R., & Castelain, T. (2018). On the hydrodynamic and acoustic nature of pressure proper orthogonal decomposition modes in the near field of a compressible jet. JOURNAL OF FLUID MECHANICS, 836, 998-1008 [10.1017/jfm.2017.839]. | |
| Handle: | http://hdl.handle.net/11590/330084 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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