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Related Experiment Video

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A straightforward method for wall impedance eduction in a flow duct.

Xiaodong Jing1, Sen Peng, Xiaofeng Sun

  • 1Fluid and Acoustic Engineering Laboratory, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, People's Republic of China. jingxd@buaa.edu.cn

The Journal of the Acoustical Society of America
|July 24, 2008
PubMed
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A new method directly measures aeroengine acoustic liner impedance under realistic flow conditions. This approach overcomes limitations of existing techniques, offering higher efficiency and accuracy for advanced noise control technology.

Area of Science:

  • Acoustics
  • Aerospace Engineering
  • Materials Science

Background:

  • Advanced liner technology is crucial for aeroengine noise control.
  • Accurate impedance measurement under flow conditions is essential but challenging.
  • Current methods face issues like initial guess dependency, high computation, and low convergence.

Purpose of the Study:

  • To develop a novel, efficient, and accurate method for measuring acoustic liner impedance in realistic aeroengine flow conditions.
  • To overcome the limitations of existing inverse impedance eduction methods.

Main Methods:

  • A new strategy directly educes impedance from sound pressure measurements on the duct wall.
  • Utilizes the summed-exponential representation of sound pressure due to the duct's modal acoustic field.

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  • Employs Prony's method to extract the axial wave number.
  • Calculates impedance using eigenvalue and dispersion relations via classical mode-decomposition analysis.

    • Main Results:

    • Successfully educed impedance directly from sound pressure data.
    • Overcame drawbacks of inverse methods, including initial guess and convergence issues.
    • Incorporated realistic multimode nonprogressive wave effects.
    • Demonstrated high computational efficiency and potential reduction in measurement points.

    Conclusions:

    • The developed straightforward method accurately determines aeroengine acoustic liner impedance under flow.
    • This technique offers significant advantages over traditional inverse methods for noise control applications.
    • The method avoids the need for duct exit impedance, simplifying the measurement process.