Steady and unsteady coupling in twin weakly underexpanded round jets

TYM Wong, MN Stavropoulos, JR Beekman… - Journal of Fluid …, 2023 - cambridge.org
We investigate the intermittency of the coupling behaviour in screeching twin round
supersonic jets at low Mach numbers across a range of nozzle spacings. Application of …

A wavelet-based separation method for tonal and broadband components of low Reynolds-number propeller noise

S Meloni, E de Paola, E Grande, D Ragni… - Measurement …, 2023 - iopscience.iop.org
Propeller noise generally exhibits a rich mixture of tonal and broadband components related
to different physical mechanisms. Specifically, the tones are characterized by having …

Data-Driven Multiobjective Optimization of Wave-Packets for Near-Field Subsonic Jet Noise

G Palma, S Meloni, R Camussi, U Iemma, C Bogey - AIAA Journal, 2023 - arc.aiaa.org
Aeroacoustics of innovative aircraft cannot disregard the development of low-order models
for the jet noise source, which are essential to assess the propulsion–airframe interactions …

A multivariate and wavelet-based analysis on the wall pressure fluctuations for propellers in ground effect

H Kamliya Jawahar, L Hanson… - International …, 2024 - journals.sagepub.com
This study, conducted at the University of Bristol's aeroacoustic facility, explores the
aeroacoustic characteristics of a 10-inch APC propeller in pusher configuration within …

A hydro-acoustic mode decomposition method for velocity and pressure field and application to a subsonic turbulent jet

S Han, H Li, Y Luo, Y Wang, R Ma, S Zhang - Physics of Fluids, 2023 - pubs.aip.org
A hydrodynamic and acoustic mode decomposition method for velocity and pressure based
on Helmholtz decomposition and momentum equation is proposed. It is able to decompose …

On the influence of the nozzle exhaust initial conditions on the near field acoustic pressure

R Camussi, S Meloni, C Bogey - Acta Acustica, 2022 - acta-acustica.edpsciences.org
In this paper, the acoustic pressure generated in the near field of a single stream cold jet is
investigated. The analysis is focused on the effect of the initial conditions at the nozzle exit …

Jet noise sources for chevron nozzles in under-expanded condition

HK Jawahar, S Meloni… - International Journal of …, 2022 - journals.sagepub.com
Imperfectly expanded jet flows are known to have additional noise sources known as
Screech and broadband shock-associated noise. They are generated by the interaction …

On investigating the hydrodynamic field for jets with and without installation effects

H Kamliya Jawahar, M Azarpeyvand - 28th AIAA/CEAS Aeroacoustics …, 2022 - arc.aiaa.org
Near-field hydrodynamic and acoustic characteristics of an unheated subsonic jet with
chevron nozzles were investigated experimentally with and without jet installation effects …

Under-expanded jet noise prediction using surrogate models based on artificial neural networks

F Centracchio, S Meloni, H Kamliya Jawahar… - 28th AIAA/CEAS …, 2022 - arc.aiaa.org
The use of surrogate models in recent times plays a key role in the design process and, over
the past few years, machine learning algorithms are adapting to the use of active …

Subsonic Jet Noise Prediction in Near and Far Field with Optimized Wave-Packet Approach

G Palma, S Meloni, R Camussi, U Iemma, C Bogey - AIAA Journal, 2024 - arc.aiaa.org
In this study, the parameters of a wave-packet model for subsonic jet noise prediction are
systematically optimized by leveraging near-and far-field data obtained from the large-eddy …