Aeroacoustic analyses of new generation and highly innovative aircraft configurations such as Hybrid and Blended Wing Body cannot disregard the development of low-order models for the jet noise source, essential to assess the propulsion-airframe interactions since the conceptual/preliminary design stage. The use of wave-packets to model jet noise is based on the widely accepted hypothesis that the large-scale turbulent structures, responsible for noise peaks emitted by subsonic and supersonic jets, can be modelled as instability waves that grow and then decay with axial distance. In this study, a M=0.9 high-subsonic jet is represented as a cylindrical surface radiating the pressure disturbances of a wave-packet source, whose parameters are optimized using near-field information from LES simulations. The importance of calibrating the model with near-field pressure data stems from the fact that innovative aircraft configurations have engines nacelles typically positioned at a few diameters from the wing or fuselage. The main scope of this analysis is to provide a noise source model that can be coupled with Boundary Elements Method (BEM) codes for aeroacoustic scattering evaluations. A quite good agreement is achieved at multiple near-field radial distances between the simulation data and model prediction for the dominating 0th azimuthal mode at the selected Strouhal numbers up to 1.

Palma, G., Meloni, S., Camussi, R., Iemma, U., Bogey, C. (2022). A Multi-Objective Optimization of a Wave-Packet Model Using Near-Field Subsonic Jet Data. In 28th AIAA/CEAS Aeroacoustics 2022 Conference [10.2514/6.2022-2934].

A Multi-Objective Optimization of a Wave-Packet Model Using Near-Field Subsonic Jet Data

Giorgio Palma
;
Stefano Meloni;Roberto Camussi;Umberto Iemma;
2022-01-01

Abstract

Aeroacoustic analyses of new generation and highly innovative aircraft configurations such as Hybrid and Blended Wing Body cannot disregard the development of low-order models for the jet noise source, essential to assess the propulsion-airframe interactions since the conceptual/preliminary design stage. The use of wave-packets to model jet noise is based on the widely accepted hypothesis that the large-scale turbulent structures, responsible for noise peaks emitted by subsonic and supersonic jets, can be modelled as instability waves that grow and then decay with axial distance. In this study, a M=0.9 high-subsonic jet is represented as a cylindrical surface radiating the pressure disturbances of a wave-packet source, whose parameters are optimized using near-field information from LES simulations. The importance of calibrating the model with near-field pressure data stems from the fact that innovative aircraft configurations have engines nacelles typically positioned at a few diameters from the wing or fuselage. The main scope of this analysis is to provide a noise source model that can be coupled with Boundary Elements Method (BEM) codes for aeroacoustic scattering evaluations. A quite good agreement is achieved at multiple near-field radial distances between the simulation data and model prediction for the dominating 0th azimuthal mode at the selected Strouhal numbers up to 1.
Palma, G., Meloni, S., Camussi, R., Iemma, U., Bogey, C. (2022). A Multi-Objective Optimization of a Wave-Packet Model Using Near-Field Subsonic Jet Data. In 28th AIAA/CEAS Aeroacoustics 2022 Conference [10.2514/6.2022-2934].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/426910
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