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Experiments with rectangular supersonic jets with potential noise reduction technology.

N Scupski1, J Akatsuka2, D K McLaughlin1

  • 1Aerospace Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

The Journal of the Acoustical Society of America
|February 2, 2022
PubMed
Summary
This summary is machine-generated.

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This study investigated supersonic jet noise reduction using fluid inserts and fluid shields in rectangular nozzles. Both methods showed potential for reducing noise radiated from aircraft engines.

Area of Science:

  • Aeronautical Engineering
  • Acoustics
  • Fluid Dynamics

Background:

  • Supersonic jets produce significant noise, impacting aircraft operations and environmental concerns.
  • Rectangular nozzles are relevant for certain aircraft designs, necessitating specific noise reduction strategies.
  • Previous research has explored various methods for jet noise mitigation, but advanced configurations require further study.

Purpose of the Study:

  • To evaluate the effectiveness of fluid inserts and fluid shields in reducing noise from supersonic rectangular jets.
  • To compare the noise reduction capabilities of two distinct active flow control techniques.
  • To assess the impact of these methods on the acoustic characteristics of overexpanded, shock-containing jets.

Main Methods:

  • Aeroacoustics experiments were conducted using supersonic jets from rectangular nozzles (aspect ratio 2).

Related Experiment Videos

  • Two noise reduction methods were tested: fluid inserts (distributed air blowing) and fluid shields in dual flow nozzles.
  • Far-field noise measurements were taken on an arc (approx. 70 equivalent nozzle diameters), with comparisons made on an equal thrust per unit exit area basis.

    • Main Results:

    • Both fluid inserts and fluid shields demonstrated noise reduction capabilities compared to a baseline single flow rectangular jet.
    • The dual flow nozzle with extended bypass flow showed specific benefits for noise radiated to the sides.
    • Acoustic spectra and directivity patterns were analyzed to quantify the noise reduction performance.

    Conclusions:

    • Fluid inserts and fluid shields are viable methods for supersonic rectangular jet noise reduction.
    • The dual flow nozzle configuration with side shields is particularly effective for reducing sideline noise.
    • Further research can optimize these active flow control techniques for practical aerospace applications.