Analysis of noise-controlled shear-layers

D. Eschricht, P. Jordan, M. Wei, J. Freund, F. Thiele

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Despite very similar flow-structures, the uncontrolled and controlled shear-layers of Wei & Freund1 were found to generate radically different sound fields (a difference of up to 11dB). In this work we analyse these flows-with a view to better understanding what led to this sound reduction-using two approaches: (1) we analyse the in-flow pressure fields in the Kx - ω domain, where we find that the acoustically-matched components of the controlled flow have been reduced substantially, while the global structure remains very similar; and, (2) we use causality-correlations to study the kernel of the Lighthill solution: the spatiotemporal source-correlation fields are found to have been dramatically degenerated by virtue of very subtle changes in the controlled flow's evolution.

Original languageEnglish (US)
Title of host publication13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624100031
DOIs
StatePublished - 2007
Event13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference) - Rome, Italy
Duration: May 21 2007May 23 2007

Publication series

Name13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)

Other

Other13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)
CountryItaly
CityRome
Period5/21/075/23/07

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

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