Acoustical power amplification and damping by temperature gradients

Tetsushi Biwa; Ryo Komatsu; Taichi Yazaki

doi:10.1121/1.3518776

Acoustical power amplification and damping by temperature gradients

Tetsushi Biwa, Ryo Komatsu, Taichi Yazaki

ENG - Mechanical Systems Engineering

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

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 τ_α 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 language	English
Pages (from-to)	132-137
Number of pages	6
Journal	Journal of the Acoustical Society of America
Volume	129
Issue number	1
DOIs	https://doi.org/10.1121/1.3518776
Publication status	Published - 2011 Jan

ASJC Scopus subject areas

Arts and Humanities (miscellaneous)
Acoustics and Ultrasonics

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abstract = "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.",

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AU - Komatsu, Ryo

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Acoustical power amplification and damping by temperature gradients

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