Mechanics & Industry
Volume 20, Number 8, 2019
Selected scientific topics in recent applied engineering – 20 Years of the ‘French Association of Mechanics – AFM’
|Number of page(s)||9|
|Published online||09 July 2020|
Numerical study of the effects of natural convection in a thermoacoustic configuration
Natural convection in thermoacoustics
LIMSI-CNRS, Université Paris-Saclay, Rue John Von Neumann,
2 Sorbonne-Université, Faculté des Sciences et Ingénierie, 4 Place Jussieu, 75005 Paris, France
3 Laboratoire DynFluid, ENSAM, 151 Bd de l’Hôpital, 75013 Paris, France
* e-mail: firstname.lastname@example.org
Accepted: 15 June 2020
This study focuses on natural convection flows within a cylindrical guide containing a porous medium. This configuration is applicable to standing-wave thermoacoustic engines, usually composed of an acoustic resonator where a (short) stack (or porous medium) is inserted, with a heat exchanger placed at one of its ends. The resulting horizontal temperature gradient, when high enough, triggers the onset of an acoustic wave. Natural convection effects are usually neglected in thermoacoustics so that axisymmetry is often assumed. Here a 3D numerical study of natural convection flow is performed using a finite volume code for solving mixed Navier-Stokes and Darcy-Brinkman equations under Boussinesq approximation. The influence of the porous medium’s physical characteristics (permeability, thermal conductivity, anisotropy) on the flow and temperature fields is investigated. It is shown that such flows are fully three-dimensional and therefore can modify significantly starting as well as steady operating conditions of the thermoacoustic engine.
Key words: Natural convection / porous medium / numerical simulation / thermoacoustics
© O. Hireche et al., published by EDP Sciences 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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