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Related Experiment Videos

A computational approach for flow-acoustic coupling in closed side branches.

P M Radavich1, A Selamet, J M Novak

  • 1The Ohio State University, Department of Mechanical Engineering and Center for Automotive Research, Columbus 43210, USA.

The Journal of the Acoustical Society of America
|April 28, 2001
PubMed
Summary

Quarter-wave resonators can become noise generators due to flow-acoustic coupling. Computational fluid dynamics modeling accurately predicts this phenomenon and identifies conditions for acoustic power generation.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Noise Control Engineering

Background:

  • Quarter-wave resonators are common duct silencers offering narrow-band acoustic attenuation.
  • Mean flow in ducts can interact with resonator acoustic resonances.
  • This interaction can lead to instability, transforming silencers into noise generators.

Purpose of the Study:

  • To model the complex flow-acoustic interaction in quarter-wave resonators.
  • To predict the conditions under which resonators become noise generators.
  • To analyze acoustic power production within the system.

Main Methods:

  • Employed computational fluid dynamics (CFD) to solve unsteady, turbulent, compressible Navier-Stokes equations.
  • Modeled low Mach number flow-acoustic interactions.

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  • Used Howe's theory to determine acoustic power generation timing and location.

    • Main Results:

    • CFD model accurately reproduced experimental results for a two-coaxial side branch system.
    • The method successfully predicted flow conditions leading to flow-acoustic coupling.
    • Identified the physics of flow-acoustic coupling and acoustic power production.

    Conclusions:

    • CFD is a viable tool for understanding and predicting flow-acoustic instabilities in resonators.
    • The study elucidates the mechanism by which silencers can become noise sources.
    • Provides insights for designing more robust noise control systems.