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Related Experiment Videos

Jet forking driven by pipe tone.

B Karthik1, S R Chakravarthy, R I Sujith

  • 1Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai-600 036, India.

The Journal of the Acoustical Society of America
|June 26, 2003
PubMed
Summary
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This study investigates airflow through a duct orifice, observing self-excited acoustic oscillations and jet forking. Jet forking occurred with same-density air, causing acoustic frequency jumps between natural duct modes.

Area of Science:

  • Fluid Dynamics
  • Acoustics
  • Aeroacoustics

Background:

  • Acoustic oscillations can occur in ducts with orifices.
  • Jet forking is a phenomenon typically observed with density-unfavorable jets.

Purpose of the Study:

  • To experimentally investigate airflow through a square-edged circular orifice.
  • To analyze self-excited acoustic oscillations and jet behavior.

Main Methods:

  • Experimental investigation of air jet flow through a circular duct orifice.
  • Analysis of acoustic oscillations and jet forking at specific Reynolds numbers (9150 < Re < 9850).

Main Results:

  • Self-excited acoustic oscillations were observed at natural duct modes for certain flow velocities.

Related Experiment Videos

  • Jet forking into two trains was observed for a jet with the same density as the ambient atmosphere.
  • Jet forking coincided with acoustic frequency jumps between natural duct modes.

    • Conclusions:

    • The study demonstrates jet forking is possible even when the jet density equals ambient density.
    • Observed acoustic oscillations and jet forking provide insights into duct-orifice aeroacoustic interactions.