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Title: Time-dependent prediction of the unsteady pressure near-field from an under-expanded jet
Authors: Rona, Aldo
Di Stefano, Danilo
Mancini, Alesandro
Hall, Edward
First Published: 16-Jun-2014
Presented at: 20th AIAA/CEAS Aeroacoustics Conference, AIAA Aviation and Aeronautics Forum and Exposition 2014, Atlanta, Georgia, USA
Start Date: 16-Jun-2014
End Date: 20-Jun-2014
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Citation: 20th AIAA/CEAS Aeroacoustics Conference, AIAA Aviation and Aeronautics Forum and Exposition, 2014, AIAA 2014-2340
Abstract: The near field of an under-expanded air jet issuing from an axi-symmetric convergent nozzle is investigated by Implicit Large Eddy Simulation at a nozzle pressure ratio of 2.27. Estimates are obtained of the tonal components of the unsteady pressure at locations representative of the engine to fuselage distance in a civil transport aircraft. At this relatively short distance from the jet axis, the radiating acoustic pressure field combines with the ‘hydrodynamic’ pressure perturbations from the jet shear-layer structures, resulting in a combined aerodynamic and acoustic forcing pressure field. The predictions offer useful insight for predicting cabin noise at cruise in civil transport aircraft fitted with high-bypass ratio engines.
DOI Link: 10.2514/MAA14
Type: Conference Paper
Rights: Copyright © 2014, AIAA. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

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