Acoustical power amplification and damping by temperature gradients

Tetsushi Biwa, Ryo Komatsu, Taichi Yazaki

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Ceperley proposed a concept of a traveling wave heat engine [A pistonless Stirling engine-The traveling wave heat engine, J. Acoust. Soc. Am. 66, 1508-1513 (1979).] that provided a starting point of thermoacoustics today. This paper verifies experimentally his idea through observation of amplification and strong damping of a plane acoustic traveling wave as it passes through axial temperature gradients. The acoustic power gain is shown to obey a universal curve specified by a dimensionless parameter ωτ; αω is the angular frequency and τα is the relaxation time for the gas to thermally equilibrate with channel walls. As an application of his idea, a three-stage acoustic power amplifier is developed, which attains the gain up to 10 with a moderate temperature ratio of 2.3.

Original languageEnglish
Pages (from-to)132-137
Number of pages6
JournalJournal of the Acoustical Society of America
Issue number1
Publication statusPublished - 2011 Jan

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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