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A thermoacoustic-Stirling heat engine: detailed study

Backhaus1, Swift

  • 1Condensed Matter and Thermal Physics Group, Los Alamos National Laboratory, New Mexico 87545, USA.

The Journal of the Acoustical Society of America
|June 30, 2000
PubMed
Summary

A novel thermoacoustic engine utilizing traveling waves achieves over 50% greater performance than standing wave engines. This advanced engine delivers significant acoustic power with high thermal efficiency, approaching Carnot limits.

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Area of Science:

  • Thermodynamics
  • Acoustics
  • Mechanical Engineering

Background:

  • Traditional thermoacoustic engines rely on standing waves, which involve intrinsically irreversible heat transfer.
  • Previous designs have limitations in efficiency and power output due to inherent irreversibilities.

Purpose of the Study:

  • To describe and analyze the performance of a new thermoacoustic engine design.
  • To compare its efficiency and power output against existing standing wave thermoacoustic engines.
  • To investigate methods for suppressing acoustic streaming and improving overall engine efficiency.

Main Methods:

  • Development of a novel thermoacoustic engine based on traveling waves and ideally reversible heat transfer.
  • Experimental measurements of acoustic power output and thermal efficiency at various operating points.

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  • Analysis of acoustic streaming effects and implementation of suppression techniques, including surface tapering and induced pressure differences.

    • Main Results:

    • The new traveling wave thermoacoustic engine outperforms standing wave engines by over 50%.
    • At peak efficiency, the engine delivered 710 W of acoustic power with 30% thermal efficiency (41% of Carnot).
    • At peak power, it delivered 890 W with 22% thermal efficiency. Acoustic streaming effects were significantly mitigated.

    Conclusions:

    • The traveling wave thermoacoustic engine represents a significant advancement in thermoacoustic technology.
    • While core dynamics are understood, further research is needed on streaming suppression and associated heat convection for enhanced efficiency.
    • The design shows potential for high-power and high-efficiency thermoacoustic energy conversion.