Free-Stream Effects on Jet-Installation Noise of a Dual-Stream Engine

Leandro Falcão Loureiro Rêgo, Francesco Avallone, Daniele Ragni, Damiano Casalino, Wouter van der Velden

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

3 Citations (Scopus)
126 Downloads (Pure)


An investigation of the effects of free-stream on jet-installation noise is performed using a numerical solver based on the lattice-Boltzmann method. In order to simulate a realistic configuration, a high-lift wing comprised by a main element and a deployed flap (MD30P30N) is placed in the vicinity of a dual-stream engine (GE90-94B). The engine operating parameters are used as inputs to generate realistic exhaust flows. Far-field noise spectra from the isolated and installed jets, obtained through the Ffowcs-Williams and Hawkings analogy, are compared for different polar angles. In the absence of free-stream, the results show a low-frequency noise amplification, occurring mainly upstream of the jet axis. This noise increase is due to a dipole source at the flap trailing-edge, where hydrodynamic waves from the jet scatter as sound to the far-field. With free-stream, the wing produces a downward flow, which deflects the jet plume. There is a consequent change on the shear layer turbulence characteristics, which is responsible for altering the far-field spectral shape and directivity pattern of the overall configuration. Through a wavelet decomposition of the near-pressure field, coherent and chaotic fluctuations are splitted. Near-field spectra show the change in amplitude of fluctuations of coherent structures due to free-stream, which are in agreement with the farfield results.
Original languageEnglish
Title of host publication25th AIAA/CEAS Aeroacoustics Conference
Subtitle of host publication20-23 May 2019 Delft, The Netherlands
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages17
ISBN (Electronic)978-1-62410-588-3
Publication statusPublished - 2019
Event25th AIAA/CEAS Aeroacoustics Conference - Delft, Netherlands
Duration: 20 May 201923 May 2019
Conference number: 25


Conference25th AIAA/CEAS Aeroacoustics Conference
Internet address

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


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