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Alejandro Rivera-Alvarez, Farid Chejne

Non-linear phenomena in thermoacoustic engines

A non-linear simplified model for a thermoacoustic engine is presented in this work, which assumes the form for the spatial dependence of the state variables and considers only effects inside the stack. For such a model the limit cycle solution is found numerically using a shooting technique in the ?T > ?T_crit region, where the stationary, fixed-point, trivial solution is unstable. With this solution a bifurcation diagram for thermoacoustic phenomena is built. Through such diagram an analysis of the non-linear nature of the generated oscillations is conducted, focusing on the presence of harmonics and the higher-order time-average pressure.

Journal of Non-Equilibrium Thermodynamics, Walter de Gruyter

Print ISSN: 0340-0204
Volume: 29, 09/2004
Pages: 209 - 220

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