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Communication Dans Un Congrès Année : 2023

A parametric analysis of the effect of the jet initial conditions on the wavelet-decomposed near-field acoustic pressure

Résumé

This paper reports a parametric analysis of the effect of the different nozzle exhaust initial conditions on the acoustic pressure generated by a single stream cold jet in its near field. The study has been performed by processing a numerical database obtained by largeeddy simulations of jet flows at M=0.9 and Re=10 5 , characterized by different nozzle exhaust turbulence intensities and boundary layer thicknesses. Pressure signals have been recorded by virtual probes distributed in several radial and axial positions in the near field of the jet covering up to 20D in the streamwise direction and 6D in the radial, and the acoustic component is extracted using a wavelet-based tool. The reconstructed acoustic time series are then analyzed both in the time and frequency domains. The results show that the boundary-layer thickness and the turbulence level significantly affect the acoustic pressure in terms of its intensity and directivity. The sideline directivity is observed to decrease for increasing turbulence level whereas it increases with the boundary layer thickness. The streamwise directivity has the opposite trend probably as an effect of the large scale. Also the energy distribution in the frequency domain depends appreciably on the aforementioned parameters but only at axial distances smaller than about 10D.
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Dates et versions

hal-04122927 , version 1 (16-06-2023)

Identifiants

Citer

Stefano Meloni, Roberto Camussi, Matteo Mancinelli, Christophe Bogey. A parametric analysis of the effect of the jet initial conditions on the wavelet-decomposed near-field acoustic pressure. 29th AIAA/CEAS Aeroacoustics Conference, Jun 2023, San Diego, CA, United States. pp.4289, ⟨10.2514/6.2023-4289⟩. ⟨hal-04122927⟩
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