Reducing the noise emanating from a twin jet nozzle using flexible filaments Topics in Flow Control. Guest editors J.P. Bonnet and L. Cattafesta

Nathaniel Lucas, Michael Doty, Lutz Taubert, Israel Wygnanski

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A twin jet was tested in anechoic facilities at the University of Arizona and NASA Langley Research Center to determine the effectiveness of flexible filaments in jet noise reduction. Results were strongly dependent on filament diameter and material, the most effective of which was found to be Tex 800 Kevlar. In the best configurations, the filaments consistently eliminated screech tones and reduced overall sound pressure level by 3 dB or more. Additionally, broadband shock noise was diminished by more than 5 dB over certain audible frequency ranges. Larger-scale tests run at NASA showed comparable reductions in overall sound pressure level and broadband shock-associated noise.

Original languageEnglish (US)
Article number1504
JournalExperiments in Fluids
Volume54
Issue number4
DOIs
StatePublished - Apr 1 2013

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ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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