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Reducing the noise emanating from a twin jet nozzle using flexible filaments

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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.

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Abbreviations

M:

Mach number

SPL:

Sound pressure level

OASPL:

Overall sound pressure level

FFT:

Fast Fourier transform

dB:

Decibel SPL, reference: 20 μPa RMS

f c :

Characteristic frequency (jet velocity/exit diameter)

St:

Strouhal number

df :

Frequency resolution

A :

Nozzle cross-sectional area

D :

Single nozzle exit diameter

L :

Filament length (from tip to nozzle exit)

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Acknowledgments

We would like to acknowledge the assistance of Dr. Jesse Little, who was very helpful in making sure the results and background information were framed in the proper context with respect to other aeroacoustics research that has been done in the past, and Philipp Tewes, who contributed to the data processing effort. Many thanks to Harry Haskin, John Swartzbaugh, and the rest of the NASA JNL crew for the exciting opportunity to collaborate our research. Funding for the NASA tests from the NASA Langley Research Directorate Office and the Fundamental Aeronautics Program Supersonics Project is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Aerospace and Mechanical Engineering, University of Arizona, 1130 N. Mountain Ave., Tucson, AZ, 85721-0119, USA

    Nathaniel Lucas, Lutz Taubert & Israel Wygnanski

  2. Aeroacoustics Branch, NASA Langley Research Center, Mail Stop 461, Hampton, VA, 23681-2199, USA

    Michael Doty & Israel Wygnanski

Authors
  1. Nathaniel Lucas
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  2. Michael Doty
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  3. Lutz Taubert
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  4. Israel Wygnanski
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Corresponding author

Correspondence to Nathaniel Lucas.

Additional information

This article is part of the collection Topics in Flow Control. Guest editors J.P. Bonnet and L. Cattafesta.

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Lucas, N., Doty, M., Taubert, L. et al. Reducing the noise emanating from a twin jet nozzle using flexible filaments. Exp Fluids 54, 1504 (2013). https://doi.org/10.1007/s00348-013-1504-8

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  • DOI: https://doi.org/10.1007/s00348-013-1504-8

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