Calculation of thermoacoustic functions with computational fluid dynamics

Simon Bühler, Douglas Wilcox, Joris Oosterhuis, Theodorus H. van der Meer

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Abstract

Thermoacoustic functions are important parameters of one-dimensional codes used for the design of thermoacoustic engines. The thermal and viscous thermoacoustic functions allow the inclusion of three dimensional effects in one-dimensional codes. These functions are especially important in the regenerator of a thermoacoustic engine, where the thermoacoustic heat pumping occurs. Even though analytical solutions were derived for uniform pores, the thermoacoustic functions for complex geometries such as stacked screen or random fiber regenerators cannot be calculated analytically. In order to gain more insight into the geometry induced complex flow fields, the procedure of Udea, et al. (2009) to estimate the thermoacoustic functions was applied in computational fluid-dynamic simulations. By using two measurement locations outside of the regenerator and modeling the regenerator as an array of uniform pores it is possible to estimate the thermoacoustic functions for complex geometries. Furthermore, a correction method is proposed to quantify the entrance effects at the beginning and end of a regular pore. The simulations are first validated for a uniform cylindrical pore with the help of the analytical solution. Then the correction method is successfully applied to a cylindrical pore with the results closely matching the analytical solution.
Original languageEnglish
Article number030003
Pages (from-to)-
Number of pages8
JournalProceedings of meetings on acoustics (POMA)
Volume19
Issue number030003
DOIs
Publication statusPublished - 2 Jun 2013
Event21st International Congress on Acoustics, ICA 2013 - Montréal, Montreal, Canada
Duration: 2 Jun 20137 Jun 2013
Conference number: 21
http://www.ica2013montreal.org/

Keywords

  • METIS-300791
  • IR-90889

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