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Modeling of Thermoacoustic Systems Using the Nonlinear Frequency-Domain Method

At high pressure amplitudes in thermoacoustic systems, higher harmonics and mass fluxes cannot be neglected. In this JASA article, the authors present a 1D model that directly solves for the periodic steady state without the need for time-consuming time integration.

Fast 1D Frequency-Domain Method for Thermoacoustics

At high amplitudes in thermoacoustic systems, nonlinear effects—such as higher harmonics and time-averaged mass fluxes—cannot be neglected. Whereas previous methods required computationally intensive time integration, the authors present a fast 1D model that directly solves for the periodic steady state in the frequency domain. This simplifies the implementation of phase shifts due to viscous friction and heat exchange. The model has been validated using an experimental standing-wave motor and enables rapid nonlinear optimization studies.

Citation for the publication

  • Authors: J.A. de Jong (University of Twente), Y.H. Wijnant (University of Twente), D. Wilcox (Chart Inc. – Qdrive), and A. de Boer (University of Twente)

  • Journal: The Journal of the Acoustical Society of America (JASA), vol. 138, issue 3, pp. 1241–1252

  • Year: 2015

  • DOI: 10.1121/1.4928301

  • Keywords: Thermoacoustics, nonlinear acoustics, frequency-domain method, periodic steady state, standing-wave motor

  • View the article on AIP / JASA

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