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Supersonic jet noise source distributions.

Nicholas P Breen1, K K Ahuja1

  • 1GTRI/ATAS, Georgia Institute of Technology, Atlanta, Georgia 30222-0844, USA.

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|October 2, 2021
PubMed
Summary
This summary is machine-generated.

Supersonic jet noise sources are more complex than subsonic jets, with distinct distributions across three Strouhal regions. High Strouhal numbers reveal shock-associated noise sources, while low Strouhal numbers show jet-mixing noise.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Aerospace Engineering

Background:

  • Supersonic jets generate complex acoustic fields.
  • Understanding noise sources is crucial for noise reduction strategies.

Purpose of the Study:

  • To investigate noise source distributions in shock-containing supersonic jets.
  • To analyze these distributions across various Mach numbers and nozzle diameters.

Main Methods:

  • Phased array (beamforming) for source location.
  • Farfield jet noise measurements.
  • Schlieren flow visualization.

Main Results:

  • Supersonic jet noise sources are more complex than subsonic jets.
  • Three Strouhal regions identified: jet-mixing noise (low), shock-associated noise (high), and an ambiguous region.
  • Shock noise sources correlate with jet shock cells and vary with Mach number.

Conclusions:

  • Noise source distributions in supersonic jets differ significantly from subsonic jets.
  • The identified Strouhal regions provide a framework for understanding supersonic jet noise.
  • Further research may be needed to resolve source ambiguity in intermediate Strouhal regions.