Noise characteristics of a four-jet impingement device inside a broadband engine noise simulator

Christoph Brehm, Jeffrey A. Housman, Cetin C. Kiris, Florence V. Hutcheson

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


The noise generation mechanisms for four directly impinging supersonic jets are investigated employing implicit large eddy simulations with a higher-order accurate weighted essentially non-oscillatory shock-capturing scheme. Impinging jet devices are often used as an experimental apparatus to emulate a broadband noise source. Although such devices have been used in many experiments, a detailed investigation of the noise generation mechanisms has not been conducted before. Thus, the underlying physical mechanisms that are responsible for the generation of sound waves are not well understood. The flow field is highly complex and contains a wide range of temporal and spatial scales relevant for noise generation. Proper orthogonal decomposition of the flow field is utilized to characterize the unsteady nature of the flow field involving unsteady shock oscillations, large coherent turbulent flow structures, and the sporadic appearance of vortex tubes in the center of the impingement region. The causality method based on Lighthill’s acoustic analogy is applied to link fluctuations of flow quantities inside the source region to the acoustic pressure in the far field. It will be demonstrated that the entropy fluctuation term in the Lighthill’s stress tensor plays a vital role in the noise generation process. Consequently, the understanding of the noise generation mechanisms is employed to develop a reduced-order linear acoustic model of the four-jet impingement device. Finally, three linear acoustic FJID models are used as broadband noise sources inside an engine nacelle and the acoustic scattering results are validated against far-field acoustic experimental data.

Original languageEnglish
Title of host publication21st AIAA/CEAS Aeroacoustics Conference
StatePublished - 2016
Event21st AIAA/CEAS Aeroacoustics Conference, 2015 - Dallas, United States
Duration: Jun 22 2015Jun 26 2015

Publication series

Name21st AIAA/CEAS Aeroacoustics Conference


Conference21st AIAA/CEAS Aeroacoustics Conference, 2015
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering


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